WorldWideScience

Sample records for corrugated steel pipe

  1. Response of reinforced concrete and corrugated steel pipes to surface load

    Science.gov (United States)

    Lay, Geoff R.

    Full-scale simulated live load tests were conducted in a controlled laboratory setting using a single-axle frame on 600-mm-inner-diameter reinforced concrete pipe (RCP) and corrugated steel pipe (CSP) when buried in dense, well-graded sand and gravel. Measurements of the RCP at nominal and working forces and beyond are reported for 0.3, 0.6 and 0.9 m of soil cover above the pipe crown. The RCP experienced no cracking when buried at 0.3 m under nominal and working CL-625 and CL-800 single-axle design loads. At these loads, the vertical contraction of the pipe diameter was less than 0.08 and 0.10 mm and the largest tensile strains in the pipe were 75 and 100 muepsilon (50-60% of the cracking strain), respectively. A 0.15 (+/-0.05)-mm-wide axial crack developed at the inner crown in the presence of a 6 kNm/m circumferential bending moment (70% of the theoretical ultimate moment capacity) at the fully factored CL-625 load. This crack did not propagate or widen from 3 series of cyclic load-unload tests. At 1300 kN of applied load the change in pipe diameter was less than 3.5 mm. Increasing soil cover from 0.3 to 0.6 to 0.9 m reduced the circumferential crown bending moment from 6.0 to 3.9 to 2.1 kNm/m, respectively, at 400 kN of axle load. A 1.6- and a 2.8-mm-thick CSP were also subjected to axle loading. No yielding or limit states occurred in the 1.6-mm-thick CSP when buried 0.9-m-deep. However, at 0.6 m of cover a 300 kN axle load caused local yielding at the pipe crown. Increasing soil cover from 0.6 to 0.9 m decreased the vertical diameter change from -3.0 to -1.2 mm and the crown bending moment from 0.7 to 0.2 kNm/m (75% and 20% of the yield moment), respectively, at a 250 kN axle load. Deflections of the thicker CSP were less than the thinner pipe below the CL-625 single-axle load, however further increases in applied load produced a greater response in the thicker pipe, likely due to a haunch support issue. Shallow axle loading produced a greater 3-dimensional

  2. Experimental studies of Steel Corrugated Constructions

    Directory of Open Access Journals (Sweden)

    Lazarev Yuriy

    2016-01-01

    Full Text Available The purpose of this particular article is to assess existing calculations of steel corrugated constructions. Steel Corrugated Construction is a perspective type of constructions, which is exhibiting numerous advantages in comparison with one that currently applied in automobile and railroad networks (reinforced concrete water-throughput pipes, reinforced concrete frame bridges. The evaluation of experimental data on models of constructions of this particular type has been carried out in order to improve calculations of Steel Corrugated Constructions.

  3. RATIONAL STEEL CORRUGATED PROFILE DESIGN

    Directory of Open Access Journals (Sweden)

    V. V. Kachurenko

    2015-08-01

    Full Text Available Purpose. The work sets forth the search results of new, more efficient design solutions for metal silos, namely, the analysis of existing types of profiles cross-section in a steel wall of such silo and development of less material-intensive section of corrugated profile.Methodology. To achieve the set goal there were researched the existing types of capacitive structure profiles and their strain-stress state under the load. The analysis was performed on the results of computational experiments. The prototype object was mathematical computer models. The calculations were made using the finite-element method. For computational experiment there was used the design-computing system Structure CAD for Windows. Findings. In this work there were obtained the data allowing to assess work of the profiles and to find more effective type of cross-section in terms of its material consumption. In the process of joint study of the authors a new type of profile for capacitive structures was developed; it has higher utilization efficiency and the attachment point of individual steel sheets with this type of profile. Both solutions are easy to install, reliable in operation and can be manufactured in the conditions of modern industrial production using standard equipment, materials and components. Originality. A new type of corrugated profile cross-section for steel silo walls was proposed; it has higher load carrying capacity and rigidity and allows reducing the metal thickness without changing the structure carrying capacity that results in material consumption reduction of the whole structure.For this and similar types of profiles there was designed and proposed the attachment point of individual corrugated sheets screwed with extending flange, which enables the unit connection in case of small size corrugations, where the distance is not sufficient to accommodate the bolt cap between the individual corrugations. Practical value.Application of the proposed

  4. Onset of Flow Induced Tonal Noise in Corrugated Pipe Segments

    NARCIS (Netherlands)

    Rudenko, O.; Nakiboglu, G.; Hirschberg, Abraham

    2014-01-01

    Corrugated pipes combine small-scale rigidity and large-scale flexibility, which make them very useful in industrial applications. The flow through such a pipe can induce strong undesirable tonal noise (whistling) and even drive integrity threatening structural vibrations. Placing a corrugated

  5. Development of Submersible Corrugated Pipe Sewage Heat Exchanger

    Institute of Scientific and Technical Information of China (English)

    BAI Li; SHI Yan; TAN Yu-fei

    2009-01-01

    Based on the characteristics of heat transfer for corrugated pipe,a method of calculating and de-sign on the submersible corrugated pipe sewage heat exchanger was put forward theoretically and experimental-ly.The actual movement parameters of air-conditioning system used in this heat exchanger were measured.The experimental result shows that the quantity of heat transfer of the corrugated pipe sewage heat exchanger can satisfy the building's load with the average coefficient of performance 4.55.At the same time.the quantity ot heat transfer of the corrugated pipe sewage heat exchanger was compared with that of the other nonmetallic sewage heat exchangers(i.e.,the plastic-Al pipe sewage heat exchanger and PP-R pipe sewage heat exchanger)experimentally.It is found out that the effect of heat transfer for submersible corrugated pipe sewage heat ex-changer is superior to those of the plastic-Al pipe and the PP-R pipe.The quantity of heat transfer per mile of corrugated pipe sewage heat exchanger is 5.2 times as much as that of the plastic-Al pipe,and it is 8.1 times as much as that of PP-R pipe.

  6. 薄壁波纹钢管混凝土柱局部屈曲性能研究%Study on the local buckling behavior of thin corrugated steel pipe concrete column

    Institute of Scientific and Technical Information of China (English)

    朱哲清; 高剑平; 罗民

    2014-01-01

    对一种新型的薄壁波纹钢管混凝土柱进行了低周反复荷载作用下滞回性能试验研究,然后利用ABAQUS进行模拟分析,分析了钢板截面宽厚比、长细比、钢板强度、混凝土强度等4个因素对薄壁波纹钢管混凝土柱局部屈曲的影响规律。试验结果表明:薄壁波纹钢管混凝土柱宽厚比、长细比基本与屈曲荷载成反比,钢板强度与屈曲荷载成正比,混凝土强度基本与屈曲荷载无关。%This paper presents an experimental research of hysteretic performance on a new kind of thin wall corrugated steel pipe concrete column under the effects of low cyclic load. The simulation analysis is carried on by ABAQUS towards the influence of such four factors as steel cross-section width-thickness ratio, slenderness ratio, steel strength, concrete strength on the thin wall corrugated steel pipe concrete column local buckling. The main conclusions are as follows: there is an inverse correlation between its width to thickness ratio, slenderness ratio and local buckling load; steel strength is proportional to the load; concrete strength has no effect on the load.

  7. Measurements of Terahertz Generation in a Metallic, Corrugated Beam Pipe

    CERN Document Server

    Bane, K L F; Fedurin, M; Kusche, K; Swinson, C; Xiang, D

    2016-01-01

    A method for producing narrow-band THz radiation proposes passing an ultra-relativistic beam through a metallic pipe with small periodic corrugations. We present results of a measurement of such an arrangement at Brookhaven's Accelerator Test Facility (ATF). Our pipe was copper and was 5 cm long; the aperture was cylindrically symmetric, with a 1 mm (radius) bore and a corrugation depth (peak-to-peak) of 60 um. In the experiment we measured both the effect on the beam of the structure wakefield and the spectral properties of the radiation excited by the beam. We began by injecting a relatively long beam compared to the wavelength of the radiation to excite the structure, and then used a downstream spectrometer to infer the radiation wavelength. This was followed by injecting a shorter bunch, and then using an interferometer (also downstream of the corrugated pipe) to measure the spectrum of the induced THz radiation.

  8. Numerical simulation of turbulent flow in corrugated pipes

    Energy Technology Data Exchange (ETDEWEB)

    Azevedo, Henrique S. de; Morales, Rigoberto E.M.; Franco, Admilson T.; Junqueira, Silvio L.M.; Erthal, Raul H. [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba, PR (Brazil). Dept. Academico de Mecanica (DAMEC)]. E-mails: rique.stel@gmail.com; rmorales@utfpr.edu.br; admilson@utfpr.edu.br; silvio@utfpr.edu.br; rherthal@utfpr.edu.br; Goncalves, Marcelo de Albuquerque Lima [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil). Centro de Pesquisas (CENPES)]. E-mail: marcelog@petrobras.com.br

    2008-07-01

    Corrugated pipes are used in various engineering applications such heat exchangers and oil transport. In most cases these pipes consist of periodically distributed grooves at the duct inner wall. Numerical and experimental works reported the influence of grooves height and length in the turbulent flow by inspection of several turbulent properties such as velocity fluctuations and Reynolds stress. The present article aims to investigate the influence of grooves height and length in the global friction factor of turbulent flow through periodically corrugated pipes. Mass and momentum conservation equations are revised and specific boundary conditions are set to characterize a periodic fully developed regime in a single axisymmetric bidimensional module which represents the periodically corrugated duct geometry. The set of algebraic equations is discretized through the Finite Volume Method, with the Hybrid interpolation scheme applied to the convective terms, and solved using the commercial software PHOENICS CFD. The simulation of turbulent, incompressible, isothermal and single-phase flow is considered. The algebraic turbulence model LVEL is used. Four geometric configurations are assumed, including grooves height and length variations, in order to compare their influence on the friction factor. The obtained numerical friction factors show good agreement with previous experimental results, specially for Reynolds numbers over 20000. Numerical results for corrugated pipes compared to the Blasius smooth pipe correlation shows that the friction factor increases compared to smooth pipes, and such increase is more significant for higher Reynolds numbers and for larger grooves as well. These trends appear to be related to an enhancement of the momentum transport over the corrugated wall due to the recirculating pattern inside the grooves, in accordance with previous experimental works (author)

  9. Flow Pressure Loss through Straight Annular Corrugated Pipes

    Science.gov (United States)

    Sargent, Joseph R.; Kirk, Daniel R.; Marsell, Brandon; Roth, Jacob; Schallhorn, Paul A.; Pitchford, Brian; Weber, Chris; Bulk, Timothy

    2016-01-01

    Pressure loss through annular corrugated pipes, using fully developed gaseous nitrogen representing purge pipes in spacecraft fairings, was studied to gain insight into a friction factor coefficient for these pipes. Twelve pipes were tested: four Annuflex, four Masterflex and two Titeflex with ¼”, 3/8”, ½” and ¾” inner diameters. Experimental set-up was validated using smooth-pipe and showed good agreement to the Moody diagram. Nitrogen flow rates between 0-200 standard cubic feet per hour were used, producing approximate Reynolds numbers from 300-23,000. Corrugation depth varied from 0.248 = E/D = 0.349 and relative corrugation pitch of 0.192 = P/D = 0.483. Differential pressure per unit length was measured and calculated using 8-9 equidistant pressure taps. A detailed experimental uncertainty analysis, including correlated bias error terms, is presented. Results show larger differential pressure losses than smooth-pipes with similar inner diameters resulting in larger friction factor coefficients.

  10. Measurements of terahertz radiation generated using a metallic, corrugated pipe

    Science.gov (United States)

    Bane, Karl; Stupakov, Gennady; Antipov, Sergey; Fedurin, Mikhail; Kusche, Karl; Swinson, Christina; Xiang, Dao

    2017-02-01

    A method for producing narrow-band THz radiation proposes passing an ultra-relativistic beam through a metallic pipe with small periodic corrugations. We present results of a measurement of such an arrangement at Brookhaven's Accelerator Test Facility (ATF). Our pipe was copper and was 5 cm long; the aperture was cylindrically symmetric, with a 1 mm (radius) bore and a corrugation depth (peak-to-peak) of 60 μm. In the experiment we measured both the effect on the beam of the structure wakefield and the spectral properties of the radiation excited by the beam. We began by injecting a relatively long beam compared to the wavelength of the radiation, but with short rise time, to excite the structure, and then used a downstream spectrometer to infer the radiation wavelength. This was followed by injecting a shorter bunch, and then using an interferometer (also downstream of the corrugated pipe) to measure the spectrum of the induced THz radiation. For the THz pulse we obtain and compare with calculations: the central frequency, the bandwidth, and the spectral power-compared to a diffraction radiation background signal.

  11. Measurements of Terahertz Radiation Generated using a Metallic, Corrugated Pipe

    CERN Document Server

    Bane, Karl; Antipov, Sergey; Fedurin, Mikhail; Kusche, Karl; Swinson, Christina; Xiang, Dao

    2016-01-01

    A method for producing narrow-band THz radiation proposes passing an ultra-relativistic beam through a metallic pipe with small periodic corrugations. We present results of a measurement of such an arrangement at Brookhaven's Accelerator Test Facility (ATF). Our pipe was copper and was 5 cm long; the aperture was cylindrically symmetric, with a 1 mm (radius) bore and a corrugation depth (peak-to-peak) of 60 um. In the experiment we measured both the effect on the beam of the structure wakefield and the spectral properties of the radiation excited by the beam. We began by injecting a relatively long beam compared to the wavelength of the radiation, but with short rise time, to excite the structure, and then used a downstream spectrometer to infer the radiation wavelength. This was followed by injecting a shorter bunch, and then using an interferometer (also downstream of the corrugated pipe) to measure the spectrum of the induced THz radiation. For the THz pulse we obtain and compare with calculations: the cen...

  12. A linear model for the onset of whistling in corrugated pipe segments: influence of geometry

    NARCIS (Netherlands)

    Rudenko, O.; Meertens, D.; Nakiboǧlu, G.; Hirschberg, A.; Belfroid, S.P.C.

    2013-01-01

    Corrugated pipes combine small-scale rigidity and large-scale flexibility, which makes them very useful in industrial applications. The flow through such a pipe can induce strong undesirable whistling noises and even drive dangerous structural vibrations. Placing a short corrugated segment along a

  13. 49 CFR 192.55 - Steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Steel pipe. 192.55 Section 192.55 Transportation... BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS Materials § 192.55 Steel pipe. (a) New steel pipe is... in accordance with paragraph (c) or (d) of this section. (b) Used steel pipe is qualified for use...

  14. Surface Impedance Formalism for a Metallic Beam Pipe with Small Corrugations

    Energy Technology Data Exchange (ETDEWEB)

    Stupakov, G.; Bane, K.L.F.; /SLAC

    2012-08-30

    A metallic pipe with wall corrugations is of special interest in light of recent proposals to use such a pipe for the generation of terahertz radiation and for energy dechirping of electron bunches in free electron lasers. In this paper we calculate the surface impedance of a corrugated metal wall and show that it can be reduced to that of a thin layer with dielectric constant {epsilon} and magnetic permeability {mu}. We develop a technique for the calculation of these constants, given the geometrical parameters of the corrugations. We then calculate, for the specific case of a round metallic pipe with small corrugations, the frequency and strength of the resonant mode excited by a relativistic beam. Our analytical results are compared with numerical simulations, and are shown to agree well.

  15. China Steel Pipes Demand Rising Steadily

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    @@ Steel pipes industry is an industry to play a decisive role in the national economic development. During the Tenth Five-Year Plan period, the steel pipes output has been increased distinctly. Based on experts forecast,the steel pipes demand in China will still be in tendency of increase during the Eleventh FiveYear Plan period, which will doubtlessly bring new opportunity and challenge to the steel pipes enterprises in China.

  16. 77 FR 67400 - RG Steel Wheeling, LLC, a Division of RG Steel, LLC, Doing Business as Wheeling Corrugating...

    Science.gov (United States)

    2012-11-09

    ... Employment and Training Administration RG Steel Wheeling, LLC, a Division of RG Steel, LLC, Doing Business as..., 2012, applicable to workers of RG Steel Wheeling, LLC, a division of RG Steel, LLC, doing business as... RG Steel, LLC, doing business as Wheeling Corrugating Company, Beech Bottom, West Virginia,...

  17. Research on Failure Modes and Key Parameters of Corrugated Steel Shear Walls

    Directory of Open Access Journals (Sweden)

    Cao Qiang

    2016-01-01

    Full Text Available The corrugated steel plate shear wall is an effective and economical lateral load resisting system. And the thin steel plate is easy to buckle. And it is necessary to use much more thickness or ribs to prevent the buckle at out of plane direction, which is not economical or complicated to construct. A number of corrugated shear walls are analyzed by nonlinear static pushover analysis method. And failure modes, buckling, the ultimate capacity, and shear force-drift curves are studied. The results showed that the corrugated steel plate can be designed according to the failure modes, in order to have a desirable failure mode that the corrugated steel plate yield before buckling.

  18. Simulation and analysis on ultrasonic testing for the cement grouting defects of the corrugated pipe

    Energy Technology Data Exchange (ETDEWEB)

    Qingbang, Han; Ling, Chen; Changping, Zhu [Changzhou Key Laboratory of Sensor Networks and Environmental Sensing, College of IOT, Hohai University Changzhou, Jiangsu, 213022 (China)

    2014-02-18

    The defects exist in the cement grouting process of prestressed corrugated pipe may directly impair the bridge safety. In this paper, sound fields propagation in concrete structures with corrugated pipes and the influence of various different defects are simulated and analyzed using finite element method. The simulation results demonstrate a much complex propagation characteristic due to multiple reflection, refraction and scattering, where the scattering signals caused by metal are very strong, while the signals scattered by an air bubble are weaker. The influence of defect both in time and frequency domain are found through deconvolution treatment. In the time domain, the deconvolution signals correspond to larger defect display a larger head wave amplitude and shorter arrive time than those of smaller defects; in the frequency domain, larger defect also shows a stronger amplitude, lower center frequency and lower cutoff frequency.

  19. Heat transfer enhancement and pumping power optimization using CuO-water nanofluid through rectangular corrugated pipe

    Science.gov (United States)

    Salehin, Musfequs; Ehsan, Mohammad Monjurul; Islam, A. K. M. Sadrul

    2017-06-01

    Heat transfer enhancement by corrugation in fluid domain is a popular method. The rate of improvement is more when it is used highly thermal conductive fluid as heating or cooling medium. In this present study, heat transfer augmentation was investigated numerically by implementing corrugation in the fluid domain and nanofluid as the base fluid in the turbulent forced convection regime. Finite volume method (FVM) was applied to solve the continuity, momentum and energy equations. All the numerical simulations were considered for single phase flow. A rectangle corrugated pipe with 5000 W/m2 constant heat flux subjected to the corrugated wall was considered as the fluid domain. In the range of Reynolds number 15000 to 40000, thermo-physical and hydrodynamic behavior was investigated by using CuO-water nanofluid from 1% to 5% volume fraction as the base fluid through the corrugated fluid domain. Corrugation justification was performed by changing the amplitude of the corrugation and the corrugation wave length for obtaining the increased heat transfer rate with minimum pumping power. For using CuO-water nanofluid, augmentation was also found more in the rectangle corrugated pipe both in heat transfer and pumping power requirement with the increase of Reynolds number and the volume fraction of nanofluid. For the increased pumping power, optimization of pumping power by using nanofluid was also performed for economic finding.

  20. Axisymmetrical electric vortex flow in a corrugated pipe

    Energy Technology Data Exchange (ETDEWEB)

    Freyberg, Ya.Zh.; Shcherbinin, E.V.

    1977-10-01

    The calculation of electric vortex flows, i.e., flows of an electrically conducting fluid arising as a result of the interaction of an electric current with the natural magnetic field, can be begun by constructing the electromagnetic force. The simplest means for constructing the electromagnetic force is to use certain harmonics of the basic equation. This article analyzes a solution of the equation which is periodic with respect to z. An effect is observed which is similar to the phenomenon, well-known in the mechanics of solids, in which the force of friction and the moment applied to a body is significant in generating the motion, in spite of the fact that the total force acting on the supporting element (the pipe in this case) is equal to zero, as for example the rolling motion of a coil in the direction opposite to the force applied to the winding. 7 references, 5 figures.

  1. Energy Industry:Hunger for Steel Pipe?

    Institute of Scientific and Technical Information of China (English)

    Berry Chen

    2009-01-01

    @@ After the ups and downs of Chinese steel pipe market in 2008, industry structure changes are taking place quietly. Some enterprises with high-end oil and natural gas pipes and high-pressure boiler tubes have not been much offected in this storm, and won good market demand, while others with low-end products have been eliminated.

  2. 49 CFR 192.105 - Design formula for steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Design formula for steel pipe. 192.105 Section 192... NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS Pipe Design § 192.105 Design formula for steel pipe. (a) The design pressure for steel pipe is determined in accordance with the following...

  3. Experiments on the influence of low frequency sound on the acoustic resonances in a corrugated flow pipe

    CERN Document Server

    Kristiansen, Ulf R; Pinhède, Cédric; Amielh, Muriel

    2010-01-01

    It is well known that an air flow in a corrugated pipe might excite the longitudinal acoustic modes of the pipe. In this letter is reported experiments where a low frequency, oscillating flow with velocity magnitudes of the same order as the air flow has been added. Depending on the oscillation strength, it might silence the pipe or move the resonances to higher harmonics. It is also shown that a low frequency oscillation by itself might excite a higher frequency acoustic resonance of the pipe.

  4. Evaluation of Steel Shear Walls Behavior with Sinusoidal and Trapezoidal Corrugated Plates

    Directory of Open Access Journals (Sweden)

    Emad Hosseinpour

    2015-01-01

    Full Text Available Reinforcement of structures aims to control the input energy of unnatural and natural forces. In the past four decades, steel shear walls are utilized in huge constructions in some seismic countries such as Japan, United States, and Canada to lessen the risk of destructive forces. The steel shear walls are divided into two types: unstiffened and stiffened. In the former, a series of plates (sinusoidal and trapezoidal corrugated with light thickness are used that have the postbuckling field property under overall buckling. In the latter, steel profile belt series are employed as stiffeners with different arrangement: horizontal, vertical, or diagonal in one side or both sides of wall. In the unstiffened walls, increasing the thickness causes an increase in the wall capacity under large forces in tall structures. In the stiffened walls, joining the stiffeners to the wall is costly and time consuming. The ANSYS software was used to analyze the different models of unstiffened one-story steel walls with sinusoidal and trapezoidal corrugated plates under lateral load. The obtained results demonstrated that, in the walls with the same dimensions, the trapezoidal corrugated plates showed higher ductility and ultimate bearing compared to the sinusoidal corrugated plates.

  5. 49 CFR 192.309 - Repair of steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Repair of steel pipe. 192.309 Section 192.309... Lines and Mains § 192.309 Repair of steel pipe. (a) Each imperfection or damage that impairs the serviceability of a length of steel pipe must be repaired or removed. If a repair is made by grinding, the...

  6. The construction of HDPE double wall corrugated pipe%HDPE 双壁波纹管的施工

    Institute of Scientific and Technical Information of China (English)

    邢东博

    2014-01-01

    简述了 HDPE 双壁波纹管的优点,从管道基础及沟槽开挖、管道安装、修补、闭水试验、连接、回填六方面出发,对 HDPE 双壁波纹管施工工序及要点作了全面的阐述,以最大限度地发挥该管材的作用。%This paper discussed simply the advantages of HDPE double wall corrugated pipe,from the pipeline foundation and trench excavation, pipeline installation,repair,closed water test,connection,backfill six aspects,fully elaborated the HDPE double wall corrugated pipe construc-tion process and main points,in order to maximize the role of pipe material.

  7. Dual phase steel for line pipe applications

    Energy Technology Data Exchange (ETDEWEB)

    Merwin, M.J. [United States Steel Corp., Research and Technology Centre, Monroeville, PA (United States)

    2005-07-01

    This paper presents the results of a laboratory study of 2 samples of commercially produced line pipe from the same melting grade. The chemistries of the steel samples were presented. The study was conducted in response to requests by the American Petroleum Institute (API) for line pipe steel with a yield-strength-to-tensile-strength ratio (Y/T) of 0.85 or less, for use in offshore installations. The United States Steel Corporation initiated this program to achieve lower Y/T for line pipe grades while maintaining robust processing capability and mechanical properties. Heat treated seamless tubular products are typically processed in a manner that can be readily modified to produce dual phase microstructures by applying intercritical soaking before quenching. The steel line pipe industry is interested in dual phase steel for use in reel barge pipe laying operations because the the yield strength of dual phase steel is lower than tensile strength. In this study, the compositions of commercially produced material already in use for the line pipe market were studied. The developed dual phase microstructures were found to be stable over a range of intercritical temperatures. Tempering temperature and small chemistry differences were found to have the greatest influence on properties. The toughness performance was found to be excellent in samples tempered at temperatures greater than 550 degrees C, a regime which produced materials with strength suitable for use in API X60 line pipe. An incomprehensible difference in tensile strength between steels of similar chemistry was also noted. Welding performance was examined through the simulation of 3 regions of the heat-affected zone. The heat-affected zone properties were not influenced by either intercritical or tempering temperature. The only significant factor was the peak temperature that was achieved in the thermal cycle. The hardness of the heat-affected zone increased continuously with increasing peak temperature

  8. Morbidity profile of steel pipe production workers

    Directory of Open Access Journals (Sweden)

    Pandit Kirti

    2008-01-01

    Full Text Available Objective: To study the different morbid conditions among steel pipe producing workers. Methods: The present cross-sectional study has been carried out among the workers of one of the steel pipes and tubes manufacturing factory of Gujarat. Hundred workers from the four major departments of the steel pipe production plant, namely welding, pressing machine, X-ray welding and loading/transportation department were covered. The information regarding demographic, occupational, clinical characteristics and diagnosis were recorded on a pre-designed proforma. Statistical analysis included calculation of percentages and proportions and was carried out using the statistical software Epi Info Version 3.3.2. Results: The mean age of the study subjects was found to be 38.7±7.1 years. The mean duration of exposure was found to be 9.0±3.4 years. Forty-four percent of the subjects had an upper respiratory tract infection, as evidenced by symptoms like dry cough, cough with rhinitis and cough with fever. Symptoms suggestive of allergic bronchitis were observed in 12% of the subjects while symptoms suggestive of heat stress such as prickly heat, dehydration, perspiration and pyrexia were observed in 13% of the subjects.

  9. 49 CFR 192.315 - Wrinkle bends in steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Wrinkle bends in steel pipe. 192.315 Section 192... Transmission Lines and Mains § 192.315 Wrinkle bends in steel pipe. (a) A wrinkle bend may not be made on steel pipe to be operated at a pressure that produces a hoop stress of 30 percent, or more, of SMYS. (b) Each...

  10. Burst limit state reliability for fiber-wrapped steel pipe

    Energy Technology Data Exchange (ETDEWEB)

    Dann, Markus R. [University of Calgary (Canada); Maes, Marc A. [Blade Energy Partners Ltd. (Canada); Salama, Mamdouh M. [ConocoPhillips Company (United States)

    2010-07-01

    In the oil and gas sector, due to the increase in demand, pipeline projects are being developed in remote areas with harsh environments. High strength steel pipelines have been developed but due to their high cost and to low production capacity, the focus is now on dry fiber augmented steel technology pipelines (FAST-Pipe). The aim of this paper is to present a probabilistic mechanical burst limit state for such fiber wrapped pipelines. This model has been developed based on a large strain Cauchy stress formulation and has been used to perform a reliability comparison between an X80 pipe and an X70 FAST-Pipe. Results showed that the FAST-Pipe has more uncertainties than the high strength steel pipe and thus lower factors should be used in their design. This paper provided a probabilistic limit state model which can be used for both steel pipes and FAST-Pipe.

  11. Mechanical characteristics of fused cast basalt tube encased in steel pipe for protecting steel surface

    Institute of Scientific and Technical Information of China (English)

    Jee-Seok WANG; Jong-Do KIM; Hee-Jong YOON

    2009-01-01

    Because of the various excellent characteristics of cast basalt materials, such as, anti-corrosion, anti-wearing, good hardness, high chemical stability, of which steel may not possess, the steel-basalt composite pipes are used in severe environments for compensating the defects of steel. The limit of bending moment with which steel-basalt composite pipe may safely endure was calculated and the limit curvature of the composite pipe in the safe range was presented. The application temperature of steel-basalt pipe was examined due to a different coefficient among basalt, mortar and mild steel.

  12. Acoustic damping in smooth and corrugated pipes with and without liquid injection

    NARCIS (Netherlands)

    Golliard, J.; Belfroid, S.P.C.; Vijlbrief, O.

    2013-01-01

    From previous experiments, it was shown that small quantities of liquids reduce or eliminate the singing phenomenon in corrugated tubes. The singing mitigation was attributed to filling up of the corrugations, interference with the boundary layer or due to the increased acoustic damping. To evaluate

  13. Crack stability analysis of low alloy steel primary coolant pipe

    Energy Technology Data Exchange (ETDEWEB)

    Tanaka, T.; Kameyama, M. [Kansai Electric Power Company, Osaka (Japan); Urabe, Y. [Mitsubishi Heavy Industries, Ltd., Takasago (Japan)] [and others

    1997-04-01

    At present, cast duplex stainless steel has been used for the primary coolant piping of PWRs in Japan and joints of dissimilar material have been applied for welding to reactor vessels and steam generators. For the primary coolant piping of the next APWR plants, application of low alloy steel that results in designing main loops with the same material is being studied. It means that there is no need to weld low alloy steel with stainless steel and that makes it possible to reduce the welding length. Attenuation of Ultra Sonic Wave Intensity is lower for low alloy steel than for stainless steel and they have advantageous inspection characteristics. In addition to that, the thermal expansion rate is smaller for low alloy steel than for stainless steel. In consideration of the above features of low alloy steel, the overall reliability of primary coolant piping is expected to be improved. Therefore, for the evaluation of crack stability of low alloy steel piping to be applied for primary loops, elastic-plastic future mechanics analysis was performed by means of a three-dimensioned FEM. The evaluation results for the low alloy steel pipings show that cracks will not grow into unstable fractures under maximum design load conditions, even when such a circumferential crack is assumed to be 6 times the size of the wall thickness.

  14. The Interlayer Stress Analysis of Polyethylene-steel Composite Pipes

    Institute of Scientific and Technical Information of China (English)

    WEI Xu-guang

    2016-01-01

    Polyethylene-steel Composite Pipes is widely used in conveying corrosive media occasions, but the pipe may lose effectiveness in the process of transporting hot and cold media, so the research of stress distribution and variation in polyethylene-steel composite pipes is very necessary.This article first assume that a thin adhesive layer is in between the polyethylene and steel, the adhesive layer along the axial shear stress is the major cause of the polyethylene layer and the steel pipe off sticky.Secondly, we use a method of finite element to computer simulation by ANSYS, and verify initial assumptions. Finally, based on simulation data, we analyse the adhesive layer stress distribution and the variation with different parameters to change.Through the above research, preliminarily summarize the variation and distribution of interlaminar stress, and provide technical support for future design and process improvement of polyethylenesteel pipe.

  15. Study on dynamic response of embedded long span corrugated steel culverts using scaled model shaking table tests and numerical analyses

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    A series of scaled-model shaking table tests and its simulation analyses using dynamic finite element method were performed to clarify the dynamic behaviors and the seismic stability of embedded corrugated steel culverts due to strong earthquakes like the 1995 Hyogoken-nanbu earthquake. The dynamic strains of the embedded culvert models and the seismic soil pressure acting on the models due to sinusoidal and random strong motions were investigated. This study verified that the corrugated culvert model was subjected to dynamic horizontal forces (lateral seismic soil pressure) from the surrounding ground,which caused the large bending strains on the structure; and that the structures do not exceed the allowable plastic deformation and do not collapse completely during strong earthquake like Hyogoken-nanbu earthquake. The results obtained are useful for design and construction of embedded long span corrugated steel culverts in seismic regions.

  16. EXTRUSION DIE CAE OF THE STEEL REINFORCED PLASTIC PIPE

    Institute of Scientific and Technical Information of China (English)

    W.Q. Ma; H.Y. Sun; D.C. Kang; K.D. Zhao

    2004-01-01

    The steel reinforced plastic pipe is a new kind of pressure pipe. It is made up with steel wires and plastic. Because reinforced skeleton of the steel wire increase the complexity of plastic flow during the extrusion phase, the traditional design criteria of extrusion die is not suitable. The study on extrusion die of the kind of pipe is very important step in produce development. Using finite element (FE) method in this paper, the flow rule of molten plastic inside the die has been predicted and a group of optimal structural parameters was obtained. These results are helpful for reducing the design cycle and improve the quality of the final product.

  17. 49 CFR 192.109 - Nominal wall thickness (t) for steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Nominal wall thickness (t) for steel pipe. 192.109... TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS Pipe Design § 192.109 Nominal wall thickness (t) for steel pipe. (a) If the nominal wall thickness for steel pipe is not known...

  18. Corrugated Shell Displacements During the Passage of a Vehicle Along a Soil-Steel Structure

    Science.gov (United States)

    Machelski, Czesław; Mumot, Marcin

    2016-12-01

    Corrugated steel plates are highly rigid and as the constructions can be immersed in soil, they can be used as soil-steel structures. With an increase of cover depth, the effectiveness of operating loads decreases. A substantial reduction of the impacts of vehicles takes place as a road or rail surface with its substructure is crucial. The scope of load's impact greatly exceeds the span L of a shell. This article presents the analysis of deformations of the upper part of a shell caused by a live load. One of the assumptions used in calculations performed in Plaxis software was the circle-shaped shell and the circumferential segment of the building structure in the 2D model. The influence lines of the components of vertical and horizontal displacements of points located at the highest place on the shell were used as a basis of analysis. These results are helpful in assessing the results of measurements carried out for the railway structure during the passage of two locomotives along the track. This type of load is characterized by a steady pressure onto wheels with a regular wheel base. The results of measurements confirmed the regularity of displacement changes during the passage of this load.

  19. 78 FR 21105 - Circular Welded Carbon Steel Pipes and Tubes From Thailand: Preliminary Results of Antidumping...

    Science.gov (United States)

    2013-04-09

    ... Carbon Steel Pipes and Tubes from Thailand: 2011- 2012 Administrative Review,'' dated concurrently with... International Trade Administration Circular Welded Carbon Steel Pipes and Tubes From Thailand: Preliminary Results of Antidumping Duty Administrative Review; 2011- 2012 AGENCY: Import Administration,...

  20. Numerical Investigation of the Seismic Behavior of Corrugated Steel Shear Wall by ABAQUS software

    Directory of Open Access Journals (Sweden)

    Ali Banazadeh

    2016-09-01

    Full Text Available Advantages of using steel shear walls in supplying the requirements of regulations relating to the peripheral loadings including winds and earthquake have caused that the use develops in constructs. High capacity of the system inenergy dissipation, significant primary stiffness, and profitability are among main advantages of this system. However, it has some weaknesses such as elastic buckling of the filler plate before its flow which this issue sometimes causes the increase in the need to out-of-plate stiffness of columns. One of the methods of coping with this phenomenon is the use ofcorrugated plates instead ofbed plates. Different studies indicate that this group of plates enjoy relatively better capacity of absorbing energy and reduce in-plate instability of the system as well. The present study is to investigate and model numerically this type of plate using ABAQUS software and by gauging the verification of numerical model outputs, develop the use of it on plates with different angular position. The results indicate that in spite of the reduction in theultimate bearing capacity of corrugated plates compared to bed plates, the degree of absorbing energy and formability of the system increases significantly.

  1. Experimental Verification of Steel Pipe Collapse under Vacuum Pressure Conditions

    Science.gov (United States)

    Autrique, R.; Rodal, E.

    2016-11-01

    Steel pipes are used widely in hydroelectric systems and in pumping systems. Both systems are subject to hydraulic transient effects caused by changes in boundary conditions, such as sudden valve closures, pump failures, or accidents. Water column separation, and its associated vaporization pressure inside the pipe, can cause the collapse of thin walled steel pipes subject to atmospheric pressure, as happened during the well known Oigawa Power Plant accident in Japan, in 1950. The conditions under which thin walled pipes subject to external pressure can collapse have been studied mathematically since the second half of the XIX century, with classical authors Southwell and Von Mises obtaining definitive equations for long and short pipes in the second decade of the XX century, in which the fundamental variables are the diameter to thickness ratio D/t and the length to diameter ratio L/D. In this paper, the predicted critical D/t ratio for steel pipe collapse is verified experimentally, in a physical model able to reproduce hydraulic transients, generating vacuum pressures through rapid upstream valve closures.

  2. 75 FR 69125 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From China

    Science.gov (United States)

    2010-11-10

    ... COMMISSION Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From China Determination... alloy steel standard, line, and pressure pipe (``seamless SLP pipe''), provided for in subheadings 7304... Charlotte R. Lane determines that the domestic seamless SLP pipe industry is materially injured by reason of...

  3. 49 CFR 192.107 - Yield strength (S) for steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Yield strength (S) for steel pipe. 192.107 Section... NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS Pipe Design § 192.107 Yield strength (S) for steel pipe. (a) For pipe that is manufactured in accordance with a specification listed in...

  4. 77 FR 54926 - Certain Seamless Carbon and Alloy Steel; Standard, Line, and Pressure Pipe From Germany

    Science.gov (United States)

    2012-09-06

    ... COMMISSION Certain Seamless Carbon and Alloy Steel; Standard, Line, and Pressure Pipe From Germany... steel standard, line, and pressure pipe from Germany would be likely to lead to continuation or... 2012), entitled Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe from...

  5. The current situation and prospect of oil steel pipe in China

    Institute of Scientific and Technical Information of China (English)

    LI; He-lin; JI; Ling-kang; XIE; Li-hua

    2005-01-01

    The oil steel pipe in the petroleum industry is very important for its high price, large consumption volume and great effect on thedevelopment of petroleum industry. The oil steel pipe mainly includes oil well pipe (drill pipe, drill collar, casing and tubing etc. ) and oil-gas transportation pipe. This paper is an attempt to make a comprehensive review on the current situation and prospect of the oil steel pipe in China, presenting the past , today and future of the China oil pipe.The first section is a historical review of the China oil pipe. The developing course and progress of the oil steel pipe products are presented. The second section is about the current situation of the China oil pipe. The general situation of the China's steel pipe corporation and their products types,capability, etc. is introduced. The third section is about the prospect of the China oil pipe. This part mainly describes the new product research and development in China steel pipe corporations,which are facing more and more strict technical requirements of the petroleum industry in oil pipe,and reveals the prosperity of China's steel pipe corporations.

  6. Evaluation of Fatigue Strength Improvement by CFRP Laminates and Shot Peening onto the Tension Flanges Joining Corrugated SteelWebs

    Directory of Open Access Journals (Sweden)

    Zhi-Yu Wang

    2015-08-01

    Full Text Available Corrugated steel web with inherent high out-of-plane stiffness has a promising application in configuring large span highway bridge girders. Due to the irregularity of the configuration details, the local stress concentration poses a major fatigue problem for the welded flange plates of high strength low alloy structural steels. In this work, the methods of applying CFRP laminate and shot peening onto the surfaces of the tension flanges were employed with the purpose of improving the fatigue strength of such configuration details. The effectiveness of this method in the improvement of fatigue strength has been examined experimentally. Test results show that the shot peening significantly increases hardness and roughness in contrast to these without treatment. Also, it has beneficial effects on the fatigue strength enhancement when compared against the test data of the joints with CFRP strengthening. The stiffness degradation during the loading progress is compared with each treatment. Incorporating the stress acting on the constituent parts of the CFRP laminates, a discussion is made regarding the mechanism of the retrofit and related influencing factors such as corrosion and economic cost. This work could enhance the understanding of the CFRP and shot peening in repairing such welded details and shed light on the reinforcement design of welded joints between corrugated steel webs and flange plates.

  7. Pressure and bending tests on fibreglass augmented steel technology pipes

    Energy Technology Data Exchange (ETDEWEB)

    Chen, Qishi; Ozkan, Istemi F. [C-FER Technologies, Edmonton, Alberta, (Canada); Salama, Mamdouh M. [ConocoPhillips Company, Houston, Texas, (United States)

    2010-07-01

    The economic manufacture of large diameter high pressure pipelines is a challenge. The FAST-PipeTM concept is fabricated from a steel liner hoop-wound with non-impregnated fibreglass stands. This report presents the qualification results of the FAST-PipeTM concept. The qualification testing program studied the effects of external environment (frozen/thawed cycle), load duration and the wrap thickness on the burst and bending capacity of the FAST-PipeTM concept. Burst and pressure-bend tests were performed under different conditions and for different thickness of fibreglass. The values obtained were compared to those from unwrapped pipes. It also established FAST-PipeTM behaviour in several loading scenarios using the FEA model. The burst tests results showed that freezing temperatures do not have an impact on the pressure capacity of FAST-PipeTM. The results of the tests showed the effectiveness of dry fibreglass wrap in increasing the internal pressure capacity of the pipe.

  8. Demonstration and Validation of Stainless Steel Materials for Critical Above Grade Piping in Highly Corrosive Locations

    Science.gov (United States)

    2017-05-01

    Prepared for Office of the Secretary of Defense (OUSD(AT&L)) Washington, DC 20301-3090 Under Project F07-AR15, “ Advanced Corrosion-Resistant Steel for...world for steel infrastruc- ture . Highly corroded carbon steel pipes at the site were replaced with two grades of stainless steel, and minor corrosion...mitigation modifications were made to pipe supports. After the rehabilitated system was commis- sioned, the pipes were inspected and tested according

  9. Research & Development of Grade X70 LSAW Steel Pipes for West-East Gas Pipeline

    Institute of Scientific and Technical Information of China (English)

    WangXiaoxiang; SunQi

    2004-01-01

    In this article the research and development of X70 large diameter longitudinal seam submerged arc welded (LSAW) steel pipes for West-East Gas Transportation Pipeline project (WEGTP) in China are introduced, including the key technique, fabrication of pipe production line, mass production and the latest progress of LSAW steel pipe technique.

  10. 49 CFR 192.115 - Temperature derating factor (T) for steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Temperature derating factor (T) for steel pipe... SAFETY TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS Pipe Design § 192.115 Temperature derating factor (T) for steel pipe. The temperature derating factor to be used in...

  11. 49 CFR 192.111 - Design factor (F) for steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Design factor (F) for steel pipe. 192.111 Section... NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS Pipe Design § 192.111 Design factor (F) for steel pipe. (a) Except as otherwise provided in paragraphs (b), (c), and (d) of this section, the...

  12. 49 CFR 192.113 - Longitudinal joint factor (E) for steel pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Longitudinal joint factor (E) for steel pipe. 192... SAFETY TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS Pipe Design § 192.113 Longitudinal joint factor (E) for steel pipe. The longitudinal joint factor to be used in the...

  13. 78 FR 45271 - Welded Stainless Steel Pressure Pipe From Malaysia, Thailand, and Vietnam

    Science.gov (United States)

    2013-07-26

    ... COMMISSION Welded Stainless Steel Pressure Pipe From Malaysia, Thailand, and Vietnam Determination On the... injured by reason of imports from Malaysia, Thailand, and Vietnam of welded stainless steel pressure pipe... pipe from Malaysia, Thailand, and Vietnam. Accordingly, effective May 16, 2013, the...

  14. Elevated temperature mechanical properties of line pipe steels

    Science.gov (United States)

    Jacobs, Taylor Roth

    The effects of test temperature on the tensile properties of four line pipe steels were evaluated. The four materials include a ferrite-pearlite line pipe steel with a yield strength specification of 359 MPa (52 ksi) and three 485 MPa (70 ksi) yield strength acicular ferrite line pipe steels. Deformation behavior, ductility, strength, strain hardening rate, strain rate sensitivity, and fracture behavior were characterized at room temperature and in the temperature range of 200--350 °C, the potential operating range for steels used in oil production by the steam assisted gravity drainage process. Elevated temperature tensile testing was conducted on commercially produced as-received plates at engineering strain rates of 1.67 x 10 -4, 8.33 x 10-4, and 1.67 x 10-3 s-1. The acicular ferrite (X70) line pipe steels were also tested at elevated temperatures after aging at 200, 275, and 350 °C for 100 h under a tensile load of 419 MPa. The presence of serrated yielding depended on temperature and strain rate, and the upper bound of the temperature range where serrated yielding was observed was independent of microstructure between the ferrite-pearlite (X52) steel and the X70 steels. Serrated yielding was observed at intermediate temperatures and continuous plastic deformation was observed at room temperature and high temperatures. All steels exhibited a minimum in ductility as a function of temperature at testing conditions where serrated yielding was observed. At the higher temperatures (>275 °C) the X52 steel exhibited an increase in ductility with an increase in temperature and the X70 steels exhibited a maximum in ductility as a function of temperature. All steels exhibited a maximum in flow strength and average strain hardening rate as a function of temperature. The X52 steel exhibited maxima in flow strength and average strain hardening rate at lower temperatures than observed for the X70 steels. For all steels, the temperature where the maximum in both flow

  15. Corrosion performance of martensitic stainless steel seamless pipe for linepipe application

    Energy Technology Data Exchange (ETDEWEB)

    Kimura, Mitsuo; Miyata, Yukio; Toyooka, Takaaki; Murase, Fumio [Kawasaki Steel Corp., Handa, Aichi (Japan)

    1999-11-01

    The corrosion performance of two types of weldable martensitic stainless steel seamless pipe for pipeline application is investigated. 11Cr steel pipe developed for sweet environment gives better resistance to CO{sub 2} corrosion than the 13Cr martensitic stainless steel for OCTG. 12Cr steel pipe developed for light sour environment shows good SSC resistance in a mild sour environment and superior CO{sub 2} corrosion resistance at high temperature and high CO{sub 2} partial pressure condition. The suitable condition for the 11Cr steel pipe and the 12Cr steel pipe in sweet environment, and the critical pH and H{sub 2}S partial pressure for the 12Cr steel pipe welded joint in sour environment are clarified. Both welded joints have superior resistance to hydrogen embrittlement under the cathodic protection condition in sea water.

  16. Fracture properties evaluation of stainless steel piping for LBB applications

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Y.J.; Seok, C.S.; Chang, Y.S. [Sung Kyun Kwan Univ., Suwon (Korea, Republic of)

    1997-04-01

    The objective of this paper is to evaluate the material properties of SA312 TP316 and SA312 TP304 stainless steels and their associated welds manufactured for shutdown cooling line and safety injection line of nuclear generating stations. A total of 82 tensile tests and 58 fracture toughness tests on specimens taken from actual pipes were performed and the effect of various parameters such as the pipe size, the specimen orientation, the test temperature and the welding procedure on the material properties are discussed. Test results show that the effect of the test temperature on the fracture toughness was significant while the effects of the pipe size and the specimen orientation on the fracture toughness were negligible. The material properties of the GTAW weld metal was in general higher than those of the base metal.

  17. Study on Domestication of Ultra-Supercritical P92 Steel Pipe Fittings

    Institute of Scientific and Technical Information of China (English)

    Cong Xiangzhou; Xu Guangxin; Wei Xiao; An Jinping; Peng Xiankuan; Hui Na; Ye Qing

    2007-01-01

    @@ P92 steel pipe fittings are key components for domestic ultra-supercritical power units.Although under booming development in some countries,presently only a few foreign units under commercial operation are using P92 steel and the experience on fabrication and operation of P92 steel pipe fittings is insufficient.

  18. Corrosion Resistance of Zn and Cu Coated Steel Pipes as a Substitute for Cu Pipe in an Air Conditioner System

    Energy Technology Data Exchange (ETDEWEB)

    Shin, Jae Gyeong; Park, Chan Jin; Hong, Sung Kil [Chonnam National University, Gwangju (Korea, Republic of)

    2009-02-15

    We investigated the corrosion resistance of Zn and Cu coated steel pipes as a substitute for Cu pipe in an air-conditioner system. In addition, the galvanic corrosion tendency between two dissimilar metal parts was studied. The corrosion resistance of the Cu electroplated steel was similar to that of Cu, while the corrosion rate of the Zn electro-galvanized and the galvalume (Zn-55 % Al) coated steels was much higher and not suitable for Cu substitute in artificial sea water and acidic rain environments. Furthermore, the galvanic difference between Cu electroplated steel and Cu was so small that the Cu coated steel pipe can be used as a substitute for Cu pipe in an air-conditioner system.

  19. Stress analysis of box girders with corrugate steel webs under distorsion%波形钢腹板箱梁畸变应力分析

    Institute of Scientific and Technical Information of China (English)

    杨丙文; 黎雅乐; 万水; 张建东

    2011-01-01

    According to mechanical characteristics of box girders with corrugated steel webs and theory of box girders, the warping normal stress of box girders with corrugated steel webs caused by distortion is studied. Considering that corrugated webs have fold effects, the corrugated webs are regarded as an orthotropic plate. Distortion governing differential equations of box girders with corrugated steel webs are derived under the equilibrium relation of plane force system within them. Their distortion angle and distortion bimoment are obtained using the beam elastic foundation (BEF) method , and then the longitudinal distortion stress is obtained. An analytical example is given to compare two types of box girders, concrete box girders and box girders with corrugated steel webs. The results of the example demonstrate that the box girders with corrugated steel webs have less lateral frame stiffness than concrete ones; thus, the distortional warping normal stress of box girders with corrugated steel webs is larger than that of concrete box girders.%在箱梁理论的基础上,根据波形钢腹板箱梁的力学特性,对波形钢腹板箱梁由畸变引起的翘曲正应力进行了研究.考虑到波形钢腹板具有褶皱效应,把波形钢腹板看作正交异性板,利用波形钢腹板箱梁中各板元平面力系的平衡关系,推导出波形钢腹板箱梁的畸变控制微分方程.采用弹性地基梁法解出波形钢腹板箱梁的畸变角和畸变双力矩,最终得到纵向畸变正应力.通过算例对比分析相同截面的波形钢腹板箱梁和混凝土箱梁的畸变翘曲正应力,计算结果表明,波形钢腹板箱梁相对普通混凝土箱梁的横向框架刚度较小,因此由畸变产生的翘曲正应力大于混凝土箱梁的畸变翘曲正应力.

  20. Fracture toughness evaluations of TP304 stainless steel pipes

    Energy Technology Data Exchange (ETDEWEB)

    Rudland, D.L.; Brust, F.W.; Wilkowski, G.M. [Battelle, Columbus, OH (United States)

    1997-02-01

    In the IPIRG-1 program, the J-R curve calculated for a 16-inch nominal diameter, Schedule 100 TP304 stainless steel (DP2-A8) surface-cracked pipe experiment (Experiment 1.3-3) was considerably lower than the quasi-static, monotonic J-R curve calculated from a C(T) specimen (A8-12a). The results from several related investigations conducted to determine the cause of the observed toughness difference are: (1) chemical analyses on sections of Pipe DP2-A8 from several surface-cracked pipe and material property specimen fracture surfaces indicate that there are two distinct heats of material within Pipe DP2-A8 that differ in chemical composition; (2) SEN(T) specimen experimental results indicate that the toughness of a surface-cracked specimen is highly dependent on the depth of the initial crack, in addition, the J-R curves from the SEN(T) specimens closely match the J-R curve from the surface-cracked pipe experiment; (3) C(T) experimental results suggest that there is a large difference in the quasi-static, monotonic toughness between the two heats of DP2-A8, as well as a toughness degradation in the lower toughness heat of material (DP2-A8II) when loaded with a dynamic, cyclic (R = {minus}0.3) loading history.

  1. Amorphous diffusion bonding of steel pipe and its impact toughness

    Institute of Scientific and Technical Information of China (English)

    WANG Xuegang; YAN Fengjie; YAN Qian; LI Xingeng

    2007-01-01

    An iron-based amorphous foil (FeNiCrSiB) was used as an interlayer for the amorphous diffusion bonding of low carbon steel pipes under argon flux. The microstructure and mechanical properties of the joint were analyzed using an electron probe micro-analyzer (EPMA), tensile test, bending test and impact test. The results show that the joint micro-structure resembles that of the base metal and no precipitates form at the joint. Melting point depressants 03, Si) diffuse far away from the joint and the base metal element is homoge-nous across the joint. The joint impact toughness is greater than the base metal toughness and the mechanical properties of the joint are similar around the pipe.

  2. Influence of corrugation shape in steel bars ductility used on reinforced concrete

    Science.gov (United States)

    Hortigón, B.; Nieto, E. J.; Fernández, F.; Hernández, O.

    2012-04-01

    Necking process stress and strain analysis, which is key to determine the plastic flow evolution in finite deformation, has been widely studied and applied to a number of materials based on the theories established by Davidenkov-Spiridnova and Bridgman in the 40's decade. These theories envolve from the study of necking geometry in fracture. In this paper, we develop an exhaustive experimental analysis of the stress and strain field in the necking process, applied to concrete bars and mechanized samples with similar features, in order to compare the results with the ones given by the theories listed above and to look for the corrugation influence in the material's plastic behavior.

  3. 75 FR 76025 - Stainless Steel Butt-Weld Pipe Fittings From Japan, Korea, and Taiwan

    Science.gov (United States)

    2010-12-07

    ... party responded to the sunset review notice of initiation by the applicable deadline * * *'' (75 FR... COMMISSION Stainless Steel Butt-Weld Pipe Fittings From Japan, Korea, and Taiwan AGENCY: United States... stainless steel butt-weld pipe fittings from Japan, Korea, and Taiwan would be likely to lead...

  4. 75 FR 53714 - Stainless Steel Butt-Weld Pipe Fittings From Japan, Korea, and Taiwan

    Science.gov (United States)

    2010-09-01

    ... imports of stainless steel butt-weld pipe fittings from Japan (53 FR 9787). On February 23, 1993, Commerce... on imports of stainless steel butt-weld pipe fittings from Japan, Korea, and Taiwan (65 FR 11766... Japan, Korea, and Taiwan (70 FR 61119). The Commission is now conducting third reviews to...

  5. 76 FR 31940 - Circular Welded Non-Alloy Steel Pipe From Taiwan: Notice of Rescission of Antidumping Duty...

    Science.gov (United States)

    2011-06-02

    ... International Trade Administration Circular Welded Non-Alloy Steel Pipe From Taiwan: Notice of Rescission of... welded non-alloy steel pipe from Taiwan. The period of review is November 1, 2009, through October 31... circular welded non-alloy steel pipe from Taiwan. See Antidumping or Countervailing Duty Order, Finding,...

  6. 76 FR 49437 - Certain Circular Welded Non-Alloy Steel Pipe From Mexico: Preliminary Results of Antidumping Duty...

    Science.gov (United States)

    2011-08-10

    ... International Trade Administration Certain Circular Welded Non-Alloy Steel Pipe From Mexico: Preliminary Results... circular welded non-alloy steel pipe from Mexico. This administrative review covers mandatory respondents... Circumstances Review: Certain Circular Welded Non-Alloy Steel Pipe From Mexico, 75 FR 82374 (December 30,...

  7. 75 FR 77838 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Preliminary Results of the...

    Science.gov (United States)

    2010-12-14

    ... International Trade Administration Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Preliminary... on circular welded non-alloy steel pipe (``CWP'') from the Republic of Korea (``Korea''). The period... Antidumping Duty Orders: Certain Circular Welded Non-Alloy Steel Pipe from Brazil, the Republic of...

  8. 77 FR 21968 - Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the People's Republic of...

    Science.gov (United States)

    2012-04-12

    ... International Trade Administration Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the... and alloy steel standard, line, and pressure pipe from the People's Republic of China. The period of... countervailing duty order on seamless carbon and alloy steel standard, line, and pressure pipe from the...

  9. 75 FR 78216 - Certain Circular Welded Non-Alloy Steel Pipe From Mexico: Preliminary Results of Antidumping Duty...

    Science.gov (United States)

    2010-12-15

    ... International Trade Administration Certain Circular Welded Non-Alloy Steel Pipe From Mexico: Preliminary Results... circular welded non-alloy steel pipe from Mexico. This administrative review covers mandatory respondents... Antidumping Duty Changed Circumstances Review: Certain Circular Welded Non-Alloy Steel Pipe and Tube...

  10. 76 FR 36089 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Final Results of the Antidumping...

    Science.gov (United States)

    2011-06-21

    ... International Trade Administration Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Final... circular welded non-alloy steel pipe (``CWP'') from the Republic of Korea (``Korea''), covering the period.... SUPPLEMENTARY INFORMATION: Background Following publication of Circular Welded Non-Alloy Steel Pipe From...

  11. 77 FR 73015 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Preliminary Results of...

    Science.gov (United States)

    2012-12-07

    ... International Trade Administration Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Preliminary... conducting an administrative review of the antidumping duty order on circular welded non-alloy steel pipe... merchandise subject to the order is circular welded non-alloy steel pipe and tube. The product is...

  12. 77 FR 34344 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Final Results of the Antidumping...

    Science.gov (United States)

    2012-06-11

    ... International Trade Administration Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Final... circular welded non-alloy steel pipe (``CWP'') from the Republic of Korea (``Korea''). The review covers...: Background Following Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Preliminary Results...

  13. 78 FR 35248 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Final Results of Antidumping...

    Science.gov (United States)

    2013-06-12

    ... International Trade Administration Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Final... order on circular welded non-alloy steel pipe (CWP) from the Republic of Korea (Korea) for the period... has been sold at less than normal value. \\1\\ See Circular Welded Non-Alloy Steel Pipe From...

  14. 78 FR 34342 - Certain Circular Welded Non-Alloy Steel Pipe From Mexico: Final Results and Partial Rescission of...

    Science.gov (United States)

    2013-06-07

    ... International Trade Administration Certain Circular Welded Non-Alloy Steel Pipe From Mexico: Final Results and... duty order on certain circular welded non- alloy steel pipe from Mexico.\\1\\ This administrative review.... \\1\\ See Certain Circular Welded Non-Alloy Steel Pipe From Mexico: Preliminary Results and...

  15. 76 FR 78614 - Welded ASTM A-312 Stainless Steel Pipe From South Korea and Taiwan: Continuation of Antidumping...

    Science.gov (United States)

    2011-12-19

    ... International Trade Administration Welded ASTM A-312 Stainless Steel Pipe From South Korea and Taiwan... welded ASTM A-312 stainless steel pipe from South Korea (Korea) and Taiwan would likely lead to... published the antidumping duty orders on welded ASTM A-312 stainless steel pipe from Korea and Taiwan.\\1\\...

  16. 76 FR 66899 - Certain Circular Welded Non-Alloy Steel Pipe From Brazil, Mexico, the Republic of Korea, and...

    Science.gov (United States)

    2011-10-28

    ... pipe from Brazil, Mexico, the Republic of Korea, and Taiwan; and certain circular welded carbon steel... Steel Pipe from Brazil, Mexico, the Republic of Korea, and Taiwan; and Certain Circular Welded Carbon... International Trade Administration Certain Circular Welded Non-Alloy Steel Pipe From Brazil, Mexico,...

  17. Mechanical Response of Steel Wire Wound Reinforced Rubber Flexible Pipe under Internal Pressure

    Institute of Scientific and Technical Information of China (English)

    GU Fan; HUANG Cheng-kui; ZHOU Jing; LI Lin-pu

    2009-01-01

    Steel wire wound reinforced flexible pipe in this study mainly consists of multiple anisotropic steel wire wound reinforcement layers and multiple isotropic rubber layers. Based on 3D anisotropic elastic theory, the analytic solutions of stresses and elastic deformations of steel wire wound reinforced rubber flexible pipe under internal pressure are presented. As the adjacent reinforcement layers with wound angle have different radii, the single reinforcement layer shows the effect of tensile-shear coupling. Moreover, the static loading test results of steel wire wound reinforced rubber flexible pipe under internal pressure are basically coincided with the calculated values by present method.

  18. MECHANICAL PROPERTIES OF LONGITUDINAL SUBMERGED ARC WELDED STEEL PIPES USED FOR GAS PIPELINE OF OFFSHORE OIL

    Institute of Scientific and Technical Information of China (English)

    Z.Z. Yang; W. Tian; Q.R. Ma; Y.L. Li; J.K. Li; J.Z. Gao; H.B. Zhang; Y.H. Yang

    2008-01-01

    Since the development of offshore oil and gas, increased submarine oil and gas pipelines were installed. All the early steel pipes of submarine pipelines depended on importing because of the strict requirements of comprehensive properties, such as,anti-corrosion, resistance to pressure and so on. To research and develop domestic steel pipes used for the submarine pipeline, the Longitudinal-seam Submerged Arc Welded (LSAW) pipes were made of steel plates cut from leveled hot rolled coils by both the JCOE and UOE (the forming process in which the plate like the letter "J", "C", "O" or "U" shape, then expansion) forming processes. Furthermore, the mechanical properties of the pipe base metal and weld metal were tested, and the results were in accordance with the corresponding pipe specification API SPEC 5L or DNV-OS-F101, which showed that domestic LSAW pipes could be used for submarine oil and gas pipelines.

  19. Microstructure and Mechanical Properties of J55ERW Steel Pipe Processed by On-Line Spray Water Cooling

    Directory of Open Access Journals (Sweden)

    Zejun Chen

    2017-04-01

    Full Text Available An on-line spray water cooling (OSWC process for manufacturing electric resistance welded (ERW steel pipes is presented to enhance their mechanical properties and performances. This technique reduces the processing needed for the ERW pipe and overcomes the weakness of the conventional manufacturing technique. Industrial tests for J55 ERW steel pipe were carried out to validate the effectiveness of the OSWC process. The microstructure and mechanical properties of the J55 ERW steel pipe processed by the OSWC technology were investigated. The optimized OSWC technical parameters are presented based on the mechanical properties and impact the performance of steel pipes. The industrial tests show that the OSWC process can be used to efficiently control the microstructure, enhance mechanical properties, and improve production flexibility of steel pipes. The comprehensive mechanical properties of steel pipes processed by the OSWC are superior to those of other published J55 grade steels.

  20. СOMPACT COMPLEX FOR PROCESSING OF LARGE-DIAMETER PIPES INTO THE ROLLING STEEL PRODUCTS

    OpenAIRE

    Steblov, A. В.; A. A. Zlobin

    2016-01-01

    A mini-plant conception for processing of previously used large-diameter pipes into the small-section rolling steel products. Projects with capacity from 15 to 200 thousand tons per year are realized in the UIS.

  1. The precision cutting control research of automotive stainless steel thin wall pipe

    Directory of Open Access Journals (Sweden)

    Jin Lihong

    2015-01-01

    Full Text Available Stainless steel thin-walled tube are widely used in automobile industry at present, but as a result of thin wall pipe is poor strength and poor rigidity,which lead to deformation, shaped differencer and other problems in the process, it is hard to ensure the processing quality of parts. This paper proposes a method of thin stainless steel thin wall pipe cutting process in vehicle, greatly improved the problems and technical difficulties in the traditional process, the main research is about the cutting system and the hydraulic fixture design, obtained under low cost circumstances, it can realize high precision stainless steel pipes, high degree of automation to automatic cutting,simplified operation steps at the same time, increased the applicability of the system, provided a kind of advanced stainless steel thin wall pipe cutting device for the small and medium-sized enterprises.

  2. Curtailing noncondensables in steel heat pipes using a NaCr solution

    Energy Technology Data Exchange (ETDEWEB)

    Akyurt, M.; Al-Rabghi, O.M. [King Abdulaziz University, Jeddah (Saudi Arabia). Dept. of Mechanical Engineering

    1999-10-01

    Experiments were performed for investigation of the long term performance of mild-steel heat pipes. Working fluids were a NaCr solution in water, as well as water. The test period covered approximately 15,000 h. It is concluded that both types of heat pipes perform well; the performance of the heat pipe containing the NaCr solution, however, is superior. (author)

  3. 77 FR 39735 - Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines

    Science.gov (United States)

    2012-07-05

    ...)] Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines Determination On the basis..., Malaysia, and the Philippines would be likely to lead to continuation or recurrence of material injury to... Pipe Fittings from Italy, Malaysia, and the Philippines: Inv. Nos. 731-TA-865-867 (Second...

  4. Changes in the passive layer of corrugated austenitic stainless steel of low nickel content due to exposure to simulated pore solutions

    Energy Technology Data Exchange (ETDEWEB)

    Bautista, A. [Departamento de Ciencia e Ingenieria de Materiales e Ingenieria Quimica, Universidad Carlos III de Madrid, Avda Universidad no. 30, 28911 Leganes, Madrid (Spain)], E-mail: mbautist@ing.uc3m.es; Blanco, G.; Velasco, F. [Departamento de Ciencia e Ingenieria de Materiales e Ingenieria Quimica, Universidad Carlos III de Madrid, Avda Universidad no. 30, 28911 Leganes, Madrid (Spain); Gutierrez, A.; Soriano, L. [Departamento de Fisica Aplicada and Instituto de Ciencia de Materiales Nicolas Cabrera, Universidad Autonoma de Madrid, Cantoblanco, 28049 Madrid (Spain); Palomares, F.J. [Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Cientificas (CSIC), Cantoblanco, Madrid (Spain); Takenouti, H. [UPR-15 du CNRS, UPMC, 4 place Jussieu, 75252 Paris Cedex 05 (France)

    2009-04-15

    In this work, changes undergone at the passive layer of a new type of corrugated austenitic stainless steel (low Ni, high Mn 204Cu type) when exposed to solutions simulating that contained in the pores of concrete have been studied. Changes in the nature of the passive layer have been characterized by X-ray photoelectronic spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). Particular focus has been put on the influence of the presence of chlorides and/or carbonation in the solution. Changes in the passive layer due to the passivation treatment that is often applied to corrugated stainless steels during manufacturing processes have also been considered. The results obtained on the 204Cu type steel have been compared with those obtained on more traditional, high Ni, austenitic AISI 304 grade and duplex SAF 2205 grade. During the immersion in simulated pore solutions, 204Cu type suffers more intense redox processes than other studied stainless steels. Moreover, it shows less Cr-rich protective passive layers in these media.

  5. 78 FR 33809 - Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the People's Republic of...

    Science.gov (United States)

    2013-06-05

    ... Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the People's Republic of China: Rescission...'') initiated an administrative review of the antidumping duty order on seamless carbon and alloy steel standard... order on seamless carbon and alloy steel standard, line, and pressure pipe from the People's Republic...

  6. 77 FR 8808 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Extension of the Final Results...

    Science.gov (United States)

    2012-02-15

    ... International Trade Administration Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Extension of... antidumping duty administrative review of circular welded non-alloy steel pipe from the Republic of Korea, covering the period November 1, 2009, through October 31, 2010. See Circular Welded Non-Alloy Steel...

  7. 76 FR 15941 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Extension of the Final Results...

    Science.gov (United States)

    2011-03-22

    ... International Trade Administration Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Extension of... antidumping duty administrative review of circular welded non-alloy steel pipe from the Republic of Korea, covering the period November 1, 2008, through October 31, 2009. See Circular Welded Non-Alloy Steel...

  8. 76 FR 76944 - Circular Welded Carbon Quality Steel Pipe From the People's Republic of China: Rescission of the...

    Science.gov (United States)

    2011-12-09

    ... Zhongyou Tipo Steel (``Shanghai Zhongyou Tipo''), Shanghai Zhongyou TIPO Steel Pipe Co., Ltd. (``Shanghai Zhongyou TIPO''), Sichuan YNJ Industries Co., Ltd. (``Sichuan YNJ''), SteelFORCE Far East Ltd. (``Steel..., Shanghai Zhongyou Tipo, Shanghai Zhongyou TIPO, Sichuan YNJ, SteelFORCE, Tianjin Baolai, Tianjin...

  9. AWWA C303-17 concrete pressure pipe, bar-wrapped, steel-cylinder type

    CERN Document Server

    2017-01-01

    This standard describes the manufacture of concrete pressure pipe, reinforced with a steel cylinder that is helically wrapped with mild steel bar reinforcement, in sizes ranging from 10 in. through 72 in. (250 mm through 1,830 mm), inclusive, and for working pressures up to 400 psi (2,760 kPa).

  10. Root causes for failures in flattening test in high frequency induction welded steel pipe mill

    Energy Technology Data Exchange (ETDEWEB)

    Babakri, Khalid Ali [Saudi Steel Pipe Company, Dammam, (Saudi Arabia)

    2010-07-01

    The flattening test is used to test weld integrity in high frequency induction welded (HFIW) steel pipe mills. The flattening test failures happen mostly with the formation of oxides in the weld area during HFIZ process. This study investigated the root causes for failure in flattening test due to improper process control in the HFIW steel pipe mill. Several flattening tests have been carried out on API 5L X60 steel pipes with various chemical compositions and various procedures (height of the ductility test). A microstructure analysis was also established (EDAX analysis). Based on the experimental data, it is found that the mills can improve flattening test performance by applying various policies. It is proposed that the acceptance criteria in the international specifications related to the test of weld ductility be modified. The reasonable height for measuring weld ductility is usually at two thirds of the specified outside diameter of the pipe.

  11. Arrangement for connecting a fiber-reinforced plastic pipe to a stainless steel flange

    Science.gov (United States)

    Allais, Arnaud; Hoffmann, Ernst

    2008-02-05

    Arrangement for connecting a fiber-reinforced plastic pipe (18) to a stainless steel flange (12, 16), in which the end of the fiber-reinforced plastic pipe (18) is accommodated in a ring-shaped groove (12a, 16a) in the flange (12, 16), the groove conforming to the dimensions of the fiber-reinforced plastic pipe (18), where the gap remaining between the end of the fiber-reinforced plastic pipe (18) and the ring-shaped groove (12a, 16a) is filled with a sealant (19).

  12. Investigations on bending condition for welded carbon steel pipe by high frequency induction heating

    Energy Technology Data Exchange (ETDEWEB)

    Matsumoto, Toshimi; Matsumoto, Teruo; Tamai, Yasumasa

    1987-08-01

    The induction heating bent pipes of carbon steel welded pipes are used for the piping in nuclear power plants, in place of elbows. This application is useful to suppress the radiation exposure at in-service inspection. The quality of the bent pipes are controlled on the technical standards of welding for electrical equipments. However, the influence of the bending condition has not been yet sufficiently understood on the mechanical properties of the bent pipes. The purpose of this investigation is to establish the appropriate bending condition for the carbon steel weld pipe which corresponds to the carbon steel pipe STPT 42 in JIS G 3456, in relation to the transformation of the structures of the base metal and the weld metal during bending. The results are summarized as follows: (1) The maximum heating temperature should be set in the range from 900 deg C to 1000 deg C, in order to assure the high Charpy impact properties. (2) The maximum heating temperature which is lower than 900 deg C causes the imperfect transformation of the base metal and the weld metal, then is likely to spoil the Charpy impact properties. (3) Higher heating rate causes the increase of A/sub c1/ point, remarkably for the base metal which has higher carbon content than weld metal. (4) Higher cooling rate causes hardening of the base metal and weld metal, however, the transformation temperature does not change remarkably, except for the Ar/sub 1/ point of base metal.

  13. Finite element thermal analysis of the fusion welding of a P92 steel pipe

    Directory of Open Access Journals (Sweden)

    A. H. Yaghi

    2012-05-01

    Full Text Available Fusion welding is common in steel pipeline construction in fossil-fuel power generation plants. Steel pipes in service carry steam at high temperature and pressure, undergoing creep during years of service; their integrity is critical for the safe operation of a plant. The high-grade martensitic P92 steel is suitable for plant pipes for its enhanced creep strength. P92 steel pipes are usually joined together with a similar weld metal. Martensitic pipes are sometimes joined to austenitic steel pipes using nickel based weld consumables. Welding involves severe thermal cycles, inducing residual stresses in the welded structure, which, without post weld heat treatment (PWHT, can be detrimental to the integrity of the pipes. Welding residual stresses can be numerically simulated by applying the finite element (FE method in Abaqus. The simulation consists of a thermal analysis, determining the temperature history of the FE model, followed by a sequentially-coupled structural analysis, predicting residual stresses from the temperature history.

    In this paper, the FE thermal analysis of the arc welding of a typical P92 pipe is presented. The two parts of the P92 steel pipe are joined together using a dissimilar material, made of Inconel weld consumables, producing a multi-pass butt weld from 36 circumferential weld beads. Following the generation of the FE model, the FE mesh is controlled using Model Change in Abaqus to activate the weld elements for each bead at a time corresponding to weld deposition. The thermal analysis is simulated by applying a distributed heat flux to the model, the accuracy of which is judged by considering the fusion zones in both the parent pipe as well as the deposited weld metal. For realistic fusion zones, the heat flux must be prescribed in the deposited weld pass and also the adjacent pipe elements. The FE thermal results are validated by comparing experimental temperatures measured by five thermocouples on the

  14. Characterization of corrosion scale formed on stainless steel delivery pipe for reclaimed water treatment.

    Science.gov (United States)

    Cui, Yong; Liu, Shuming; Smith, Kate; Yu, Kanghua; Hu, Hongying; Jiang, Wei; Li, Yuhong

    2016-01-01

    To reveal corrosion behavior of stainless steel delivery pipe used in reclaimed water treatment, this research focused on the morphological, mineralogical and chemical characteristics of stainless steel corrosion scale and corroded passive film. Corrosion scale and coupon samples were taken from a type 304 pipe delivering reclaimed water to a clear well in service for more than 12 years. Stainless steel corrosion scales and four representative pipe coupons were investigated using mineralogy and material science research methods. The results showed corrosion scale was predominantly composed of goethite, lepidocrocite, hematite, magnetite, ferrous oxide, siderite, chrome green and chromite, the same as that of corroded pipe coupons. Hence, corrosion scale can be identified as podiform chromite deposit. The loss of chromium in passive film is a critical phenomenon when stainless steel passive film is damaged by localized corrosion. This may provide key insights toward improving a better comprehension of the formation of stainless steel corrosion scale and the process of localized corrosion. The localized corrosion behavior of stainless steel is directly connected with reclaimed water quality parameters such as residual chlorine, DO, Cl(-) and SO4(2-). In particular, when a certain amount of residual chlorine in reclaimed water is present as an oxidant, ferric iron is the main chemical state of iron minerals.

  15. 75 FR 44763 - Certain Circular Welded Non-Alloy Steel Pipe From Mexico; Extension of Time Limit for Preliminary...

    Science.gov (United States)

    2010-07-29

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF COMMERCE International Trade Administration Certain Circular Welded Non-Alloy Steel Pipe From Mexico; Extension of Time... welded non- alloy steel pipe from Mexico. We also received review requests on November 30, 2009,...

  16. 76 FR 52636 - Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Partial Rescission of...

    Science.gov (United States)

    2011-08-23

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF COMMERCE International Trade Administration Circular Welded Non-Alloy Steel Pipe From the Republic of Korea: Partial... the antidumping duty order on certain circular welded non-alloy steel pipe (``circular welded...

  17. 75 FR 39917 - Circular Welded Non-Alloy Steel Pipe from the Republic of Korea: Extension of Time Limit for...

    Science.gov (United States)

    2010-07-13

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF COMMERCE International Trade Administration (A-580-809) Circular Welded Non-Alloy Steel Pipe from the Republic of Korea... non-alloy steel pipe from the Republic of Korea, covering the period November 1, 2008 through...

  18. 77 FR 43806 - Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the People's Republic of...

    Science.gov (United States)

    2012-07-26

    ... International Trade Administration Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the... Department) initiated an administrative review of the antidumping duty order on seamless carbon and alloy... carbon and alloy steel standard, line, and pressure pipe from the People's Republic of China covering...

  19. 77 FR 42697 - Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines: Continuation...

    Science.gov (United States)

    2012-07-20

    ... Orders: Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines, 66 FR 11257 (February 23, 2001). \\2\\ See Initiation of Five-Year (``Sunset'') Review, 76 FR 67412 (November 1, 2011... Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines, 77 FR 39735 (July 5, 2012),...

  20. 76 FR 67673 - Welded ASTM A-312 Stainless Steel Pipe From South Korea and Taiwan: Final Results of Expedited...

    Science.gov (United States)

    2011-11-02

    ... International Trade Administration Welded ASTM A-312 Stainless Steel Pipe From South Korea and Taiwan: Final... (the Department) initiated sunset reviews of the antidumping duty orders on welded ASTM A-312 stainless... the antidumping duty orders on welded ASTM A-312 stainless steel pipe from South Korea and...

  1. 77 FR 73617 - Certain Circular Welded Non-Alloy Steel Pipe From Mexico: Preliminary Results and Partial...

    Science.gov (United States)

    2012-12-11

    ... Value: Circular Welded Non-Alloy Steel Pipe From Mexico, 57 FR 42953 (September 17, 1992). Notification... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF COMMERCE International Trade Administration Certain Circular Welded Non-Alloy Steel Pipe From Mexico: Preliminary...

  2. 76 FR 78313 - Circular Welded Carbon-Quality Steel Pipe From India, Oman, the United Arab Emirates, and Vietnam

    Science.gov (United States)

    2011-12-16

    ... COMMISSION Circular Welded Carbon-Quality Steel Pipe From India, Oman, the United Arab Emirates, and Vietnam... United Arab Emirates, and Vietnam of circular welded carbon- quality steel pipe, provided for in... of India, Oman, the United Arab Emirates, and Vietnam.\\2\\ \\1\\ The record is defined in sec....

  3. 77 FR 61738 - Circular Welded Carbon Steel Pipes and Tubes From Thailand: Final Results of Antidumping Duty...

    Science.gov (United States)

    2012-10-11

    ... International Trade Administration Circular Welded Carbon Steel Pipes and Tubes From Thailand: Final Results of..., Department of Commerce. SUMMARY: On April 6, 2012, the Department of Commerce (the Department) published the... pipes and tubes from Thailand.\\1\\ This review covers the respondents Pacific Pipe Public Company...

  4. A simplified LBB evaluation procedure for austenitic and ferritic steel piping

    Energy Technology Data Exchange (ETDEWEB)

    Gamble, R.M.; Wichman, K.R.

    1997-04-01

    The NRC previously has approved application of LBB analysis as a means to demonstrate that the probability of pipe rupture was extremely low so that dynamic loads associated with postulated pipe break could be excluded from the design basis (1). The purpose of this work was to: (1) define simplified procedures that can be used by the NRC to compute allowable lengths for circumferential throughwall cracks and assess margin against pipe fracture, and (2) verify the accuracy of the simplified procedures by comparison with available experimental data for piping having circumferential throughwall flaws. The development of the procedures was performed using techniques similar to those employed to develop ASME Code flaw evaluation procedures. The procedures described in this report are applicable to pipe and pipe fittings with: (1) wrought austenitic steel (Ni-Cr-Fe alloy) having a specified minimum yield strength less than 45 ksi, and gas metal-arc, submerged arc and shielded metal-arc austentic welds, and (2) seamless or welded wrought carbon steel having a minimum yield strength not greater than 40 ksi, and associated weld materials. The procedures can be used for cast austenitic steel when adequate information is available to place the cast material toughness into one of the categories identified later in this report for austenitic wrought and weld materials.

  5. Concrete filled steel pipe inspection using electro magnetic acoustic transducer (EMAT)

    Science.gov (United States)

    Na, Won-Bae; Kundu, Tribikram; Ryu, Yeon-Sun; Kim, Jeong-Tae

    2005-05-01

    Concrete-filled steel pipes are usually exposed in hostile environments such as seawater and deicing materials. The outside corrosion of the steel pipe can reduce the wall thickness and the corrosion-induced delamination of internal concrete can increase internal volume or pressure. In addition, the void that can possibly exist in the pipe reduces the bending resistance. To avoid structural failure due to this type of deterioration, appropriate inspection and repair techniques are to be developed. Guided wave techniques have strong potentials for this kind of inspection because of long-distance inspection capability. Among different transducer-coupling mechanism, electro-magnetic acoustic transducers (EMATs) give relatively consistent results in comparison to piezoelectric transducers since they do not need any couplant. In this study EMATs are used for transmitting and receiving cylindrical guided waves through concrete-filled steel pipes. Through time history curves and wavelet transform, it is shown that EMAT-generated cylindrical guided wave techniques have good potential for the interface inspection of concrete-filled steel pipes.

  6. Investigations on the Suitability of Coated Steel Piping System for High Pressure Seawater Reverse Osmosis Application

    Science.gov (United States)

    Mobin, Mohammad

    2010-03-01

    This study deals with the investigations concerning with the suitability of coated steel piping system as an economically viable alternative to costly stainless steel piping for high pressure seawater reverse osmosis (SWRO) application. The piping system selected for investigation is a carbon steel piping coated internally and externally with thermoplastic coating (coating powder Plascoat PPA 571). The performance of thermoplastic coating was investigated by conducting SWRO pilot plant test, salt spray test, mechanical tests and testing of the coating under crevices (both in pilot plant and laboratory), and for leachable organics and inorganics (both in laboratory and pilot plant test). The testing of coating in the pilot plant resulted in the formation of some blisters on the internal surface of the pipes. The blisters were broken causing the corrosion of underneath steel. The coating showed a poor resistance to salt fog test. In general, the coating performed satisfactorily under the crevices but showed blistering on either side of the test panels. The adhesive strength of the coating was found to be poor; however, it showed good flexibility. The results of chemical analysis did not show the leaching of organic or inorganic pollutants from the coating.

  7. Shock Wave Speed and Transient Response of PE Pipe with Steel-Mesh Reinforcement

    Directory of Open Access Journals (Sweden)

    Wuyi Wan

    2016-01-01

    Full Text Available A steel mesh can improve the tensile strength and stability of a polyethylene (PE pipe in a water supply pipeline system. However, it can also cause more severe water hammer hazard due to increasing wave speed. In order to analyze the influence of the steel mesh on the shock wave speed and transient response processes, an improved wave speed formula is proposed by incorporating the equivalent elastic modulus. A field measurement validates the wave speed formula. Moreover, the transient wave propagation and extreme pressures are simulated and compared by the method of characteristics (MOC for reinforced PE pipes with various steel-mesh densities. Results show that a steel mesh can significantly increase the shock wave speed in a PE pipe and thus can cause severe peak pressure and hydraulic surges in a water supply pipeline system. The proposed wave speed formula can more reasonably evaluate the wave speed and improve the transient simulation of steel-mesh-reinforced PE pipes.

  8. 75 FR 13729 - Circular Welded Non-Alloy Steel Pipe from the Republic of Korea: Extension of Time Limit for the...

    Science.gov (United States)

    2010-03-23

    ... International Trade Administration Circular Welded Non-Alloy Steel Pipe from the Republic of Korea: Extension of... circular welded non-alloy steel pipe from the Republic of Korea, covering the period November 1, 2007 through October 31, 2008. See Circular Welded Non-Alloy Steel Pipe from the Republic of Korea:...

  9. Shock Wave Speed and Transient Response of PE Pipe with Steel-Mesh Reinforcement

    OpenAIRE

    2016-01-01

    A steel mesh can improve the tensile strength and stability of a polyethylene (PE) pipe in a water supply pipeline system. However, it can also cause more severe water hammer hazard due to increasing wave speed. In order to analyze the influence of the steel mesh on the shock wave speed and transient response processes, an improved wave speed formula is proposed by incorporating the equivalent elastic modulus. A field measurement validates the wave speed formula. Moreover, the transient wave ...

  10. Steel fiber reinforced concrete pipes: part 1: technological analysis of the mechanical behavior

    Directory of Open Access Journals (Sweden)

    A. D. de Figueiredo

    Full Text Available This paper is the first part of an extensive work focusing the technological development of steel fiber reinforced concrete pipes (FRCP. Here is presented and discussed the experimental campaign focusing the test procedure and the mechanical behavior obtained for each of the dosages of fiber used. In the second part ("Steel fiber reinforced concrete pipes. Part 2: Numerical model to simulate the crushing test", the aspects of FRCP numerical modeling are presented and analyzed using the same experimental results in order to be validated. This study was carried out trying to reduce some uncertainties related to FRCP performance and provide a better condition to the use of these components. In this respect, an experimental study was carried out using sewage concrete pipes in full scale as specimens. The diameter of the specimens was 600 mm, and they had a length of 2500 mm. The pipes were reinforced with traditional bars and different contents of steel fibers in order to compare their performance through the crushing test. Two test procedures were used in that sense. In the 1st Series, the diameter displacement was monitored by the use of two LVDTs positioned at both extremities of the pipes. In the 2nd Series, just one LVDT is positioned at the spigot. The results shown a more rigidity response of the pipe during tests when the displacements were measured at the enlarged section of the socket. The fiber reinforcement was very effective, especially when low level of displacement was imposed to the FRCP. At this condition, the steel fibers showed an equivalent performance to superior class pipes made with traditional reinforced. The fiber content of 40 kg/m3 provided a hardening behavior for the FRCP, and could be considered as equivalent to the critical volume in this condition.

  11. 考虑腹板剪切行为的波形钢腹板梁理论模型%Theory Model of Corrugated Steel Web Girder Considering Web Shear Behavior

    Institute of Scientific and Technical Information of China (English)

    聂建国; 李法雄

    2011-01-01

    为研究波形钢腹板剪切变形对波形钢腹板梁受力行为的影响,引入腹板剪切变形转角函数,将波形钢腹板梁的弯曲行为分解为桁架作用和弯曲作用,建立一个能够考虑波形钢腹板剪切变形的波形钢腹板梁理论模型。推导了端部无约束条件下简支波形钢腹板梁在均布荷载和端部约束条件下简支波形钢腹板梁在跨中集中荷载作用下的解析解,采用有限元方法验证了理论模型和解析解的正确性和适用性。研究结果表明:端部约束条件对主梁变形影响很小;波形钢腹板的剪切变形对主梁变形影响显著,在常见波形钢腹板梁桥尺寸范围内,由腹板剪切变形引起的主梁挠度占总挠度的10%~30%。%In order to study the influence of shear deformation of forcing behavior for corrugated steel web,shear rotation function of calculating shear deformation in the web was introduced,a theory model of corrugated steel web girder was presented.In the model,bending behavior of corrugated steel web girder could be divided into truss action and bending action between upper-flange and sub-flange.Then,analytical solutions for the cases of simply-supported corrugated steel web girder without end restraint sustaining under uniform distribution load and simply-supported corrugated steel web girder with end restraint under sustaining mid-span concentrated load were derived,validity and usability of the analytical solution and the model were well proved by finite element method.Results show that the end constraint conditions have little effect on the deformation of the main girder.However,the shear deformation of corrugated steel web has great impact on the deformation of main girder.In the common size ranges of bridge with corrugated steel web girders,the proportion of main girder deflection caused by shear deformation in the web may reach 10% to 30% of total deflection.

  12. THE EFFECT OF CORRUGATED ELEMENTS THICKNESS ON THE DEFLECTED MODE OF CORRUGATED METAL STRUCTURES

    Directory of Open Access Journals (Sweden)

    V. V. Kovalchuk

    2015-06-01

    Full Text Available Purpose. The work provides research the deflected mode and calculation the relative deformation of vertical and horizontal diameters of corrugated metal structures (CMS, horizontal ellipse type, and cross section in their interaction with soil backfill depending on the thickness of corrugated metal pipe. Such studies are required for optimal design of CMS, establishing the causes of defects timely, appropriate engineering solutions to improve the bearing capacity of the CMS and reasonable use of funds for their construction or rehabilitation of existing transportation facilities using corrugated metal pipes. Methodology. Stresses and stability calculations of CMS form are conducted using the developed mathematical algorithm in program environment Mathcad 14. In these studies different thickness of corrugated metal pipe were assigned, and further calculations were carried out at the design value of backfill soil compaction degree and magnitude of dynamic loading of railway transport. Findings. From the calculations is determined that the most influence the thickness of the corrugated metal pipe has on the strength in the calculation of the normal stresses and value of the vertical pipe strains. Therefore, the calculated parameters in the design of corrugated metal structures with small filling heights (from 1.2 m to 3 m above its peak is calculation of the strength by the normal stresses and determination of the vertical deformation of the pipe. Originality. For the first time, calculations of the deflected mode and relative deformations of vertical and horizontal cross-sectional diameters of CMS, horizontal ellipse type in the interaction with soil backfill. The factors complex was taken into account the backfill soil compaction degree, the value of dynamic loading of railway transport and different thickness of corrugated metal pipe. Practical value. The results of the deflected mode of corrugated metal structures such as horizontal ellipse of

  13. Effect of dynamic monotonic and cyclic loading on fracture behavior for Japanese carbon steel pipe STS410

    Energy Technology Data Exchange (ETDEWEB)

    Kinoshita, Kanji; Murayama, Kouichi; Ogata, Hiroyuki [and others

    1997-04-01

    The fracture behavior for Japanese carbon steel pipe STS410 was examined under dynamic monotonic and cyclic loading through a research program of International Piping Integrity Research Group (EPIRG-2), in order to evaluate the strength of pipe during the seismic event The tensile test and the fracture toughness test were conducted for base metal and TIG weld metal. Three base metal pipe specimens, 1,500mm in length and 6-inch diameter sch.120, were employed for a quasi-static monotonic, a dynamic monotonic and a dynamic cyclic loading pipe fracture tests. One weld joint pipe specimen was also employed for a dynamic cyclic loading test In the dynamic cyclic loading test, the displacement was controlled as applying the fully reversed load (R=-1). The pipe specimens with a circumferential through-wall crack were subjected four point bending load at 300C in air. Japanese STS410 carbon steel pipe material was found to have high toughness under dynamic loading condition through the CT fracture toughness test. As the results of pipe fracture tests, the maximum moment to pipe fracture under dynamic monotonic and cyclic loading condition, could be estimated by plastic collapse criterion and the effect of dynamic monotonic loading and cyclic loading was a little on the maximum moment to pipe fracture of the STS410 carbon steel pipe. The STS410 carbon steel pipe seemed to be less sensitive to dynamic and cyclic loading effects than the A106Gr.B carbon steel pipe evaluated in IPIRG-1 program.

  14. Acoustical studies on corrugated tubes

    Science.gov (United States)

    Balaguru, Rajavel

    Corrugated tubes and pipes offer greater global flexibility combined with local rigidity. They are used in numerous engineering applications such as vacuum cleaner hosing, air conditioning systems of aircraft and automobiles, HVAC control systems of heating ducts in buildings, compact heat exchangers, medical equipment and offshore gas and oil transportation flexible riser pipelines. Recently there has been a renewed research interest in analyzing the flow through a corrugated tube to understand the underlying mechanism of so called whistling, although the whistling in such a tube was identified in early twentieth century. The phenomenon of whistling in a corrugated tube is interesting because an airflow through a smooth walled tube of similar dimensions will not generate any whistling tones. Study of whistling in corrugated tubes is important because, it not only causes an undesirable noise problem but also results in flow-acoustic coupling. Such a coupling can cause significant structural vibrations due to flow-acoustic-structure interaction. This interaction would cause flow-induced vibrations that could result in severe damage to mechanical systems having corrugated tubes. In this research work, sound generation (whistling) in corrugated tubes due to airflow is analyzed using experimental as well as Computational Fluid Dynamics-Large Eddy Simulation (CFD-LES) techniques. Sound generation mechanisms resulting in whistling have been investigated. The whistling in terms of frequencies and sound pressure levels for different flow velocities are studied. The analytical and experimental studies are carried out to understand the influence of various parameters of corrugated tubes such as cavity length, cavity width, cavity depth, pitch, Reynolds numbers and number of corrugations. The results indicate that there is a good agreement between theoretically calculated, computationally predicted and experimentally measured whistling frequencies and sound pressure levels

  15. Viscoelastic behavior and durability of steel wire - reinforced polyethylene pipes under a high internal pressure

    NARCIS (Netherlands)

    Ivanov, S.; Anoshkin, A.N.; Zuyko, V.Yu

    2011-01-01

    The strength tests of steel-wire-reinforced polyethylene pipe specimens showed that, under a constant internal pressure exceeding 80% of their short-term ultimate pressure, the fracture of the specimens occurred in less than 24 hours. At pressures slightly lower than this level, some specimens did n

  16. 78 FR 31574 - Welded Stainless Steel Pressure Pipe From Malaysia, Thailand, and Vietnam; Institution of...

    Science.gov (United States)

    2013-05-24

    ... the Commission's Handbook on Filing Procedures, 76 FR 62092 (Oct. 6, 2011), available on the... COMMISSION Welded Stainless Steel Pressure Pipe From Malaysia, Thailand, and Vietnam; Institution of... materially retarded, by reason of imports from Malaysia, Thailand, and Vietnam of welded stainless...

  17. STUDY OF ELECTROMAGNETIC STIRRING REFINING MICRO- STRUCTURES OF PIPE-LINE STEEL SAW DEPOSITS

    Institute of Scientific and Technical Information of China (English)

    Y. Zhang; B.N. Qian; X.M. Guo

    2002-01-01

    The effects of electromagnetic stirring on the microstructures of pipe-line steel SAWdeposited metal were investigated. The results showed that electromagnetic stirringincreased the number density of inclusions with 0.2-0.6μm in diameter and promotedthe formation and refining of acicular ferrite within austenite grains. The low tem-perature toughness of deposited metal was improved.

  18. СOMPACT COMPLEX FOR PROCESSING OF LARGE-DIAMETER PIPES INTO THE ROLLING STEEL PRODUCTS

    Directory of Open Access Journals (Sweden)

    A. В. Steblov

    2016-01-01

    Full Text Available A mini-plant conception for processing of previously used large-diameter pipes into the small-section rolling steel products. Projects with capacity from 15 to 200 thousand tons per year are realized in the UIS.

  19. 波纹钢腹板梁疲劳性能的试验研究%Experimental study on fatigue performance of the beam with corrugated steel webs

    Institute of Scientific and Technical Information of China (English)

    谭莲飞; 王清远; 王志宇; 吴彦增

    2012-01-01

    结合国内已建波纹钢腹板PC组合梁桥(平铁大桥)的波形尺寸,设计了4根Q345c高强钢的波纹钢腹板试验梁.试验首先对第一根梁(GA)进行四点弯曲静力试验,分析了其在竖向荷载作用下的受力特征和破坏形态;另外3根梁分别采用R=0.1,荷载下限分别为9,11,13 kN的不同条件下的疲劳试验.结果表明,由于波纹腹板的“折扇”效应,在弯矩作用下不完全满足平截面假定条件,弯矩主要由上下翼缘承受;二级焊缝条件下,试验梁波纹处焊缝能满足美国AASHTO规范B类焊接的疲劳强度,焊缝搭接位置以及构造处是该类型梁的疲劳薄弱位置之一.%Combined with the built box-girder bridge with corrugated webs named Ping Tie Bridge, designed 4 beams with corrugated webs of Q345c high-strength steel. The first beam ( CA) test for four-point bending static test, it tells the static characteristics and failure mode in the vertical load force. The other three beams were under fatigue test in different loading conditions, with R =0. 1 and the load lower limits were 9,11 ,13 kN respectively. The results show that there is a "folding" effect in the corrugated web,thus the beam does not fully meet the plane section assumption under the action of the moment which mainly endured by the upper and lower flange. Under second level welding condition, the weld of corrugated web and flange may meet fatigue strength of Class B specifications according to United States AASHTO. The overlap of welding or constructions on the beam may be the fatigue weak positions.

  20. Heat sink welding of austenitic stainless steel pipes to control distortion and residual stress

    Energy Technology Data Exchange (ETDEWEB)

    Kumar, H.; Albert, S.K.; Bhaduri, A.K. [Materials Technology Div., Indira Gandhi Centre for Atomic Research, Kalpakkam (India)

    2007-07-01

    Construction of India's Prototype Fast Breeder Reactor (PFBR) involves extensive welding of austenitic stainless steels pipes of different dimensions. Due to high thermal expansion coefficient and poor thermal conductivity of this class of steels, welding can result in significant distortion of these pipes. Attempts to arrest this distortion can lead to high levels of residual stresses in the welded parts. Heat sink welding is one of the techniques often employed to minimize distortion and residual stress in austenitic stainless steel pipe welding. This technique has also been employed to repair welding of the piping of the Boiling Water Reactors (BWRs) subjected to radiation induced intergranular stress corrosion cracking (IGSCC). In the present study, a comparison of the distortion in two pipe welds, one made with heat sink welding and another a normal welds. Pipes of dimensions 350{phi} x 250(L) x 8(t) mm was fabricated from 316LN plates of dimensions 1100 x 250 x 8 mm by bending and long seam (L-seam) welding by SMAW process. Two fit ups with a root gap of 2 mm, land height of 1mm and a groove angle of 70 were prepared using these pipes for circumferential seam (C-seam) welding. Dimensions at predetermined points in the fit up were made before and after welding to check the variation in radius, circumference and and ovality of the pipes. Root pass for both the pipe fit up were carried out using conventional GTAW process with 1.6 mm AWS ER 16-8-2 as consumables. Welding of one of the pipe fit ups were completed using conventions GTAW process while the other was completed using heat sink welding. For second and subsequent layers of welding using this process, water was sprayed at the root side of the joint while welding was in progress. Flow rate of the water was {proportional_to}6 1/minute. Welding parameters employed were same as those used for the other pipe weld. Results of the dimensional measurements showed that there is no circumferential shrinkage in

  1. Evaluation of weld defects in stainless steel 316L pipe using guided wave

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Joon Hyun [School of Mechanical Engineering, Pusan National University, Busan (Korea, Republic of); Lee, Jin Kyung [Dept. of Mechanical Engineering, Dongeui University, Busan (Korea, Republic of)

    2015-02-15

    Stainless steel is a popular structural materials for liquid-hydrogen storage containers and piping components for transporting high-temperature fluids because of its superior material properties such as high strength and high corrosion resistance at elevated temperatures. In general, tungsten inert gas (TIG) arc welding is used for bonding stainless steel. However, it is often reported that the thermal fatigue cracks or initial defects in stainless steel after welding decreases the reliability of the material. The objective of this paper is to clarify the characteristics of ultrasonic guided wave propagation in relation to a change in the initial crack length in the welding zone of stainless steel. For this purpose, three specimens with different artificial defects of 5 mm, 10 mm, and 20 mm in stainless steel welds were prepared. By considering the thickness of s stainless steel pipe, special attention was given to both the L(0,1) mode and L(0,2) mode in this study. It was clearly found that the L(0,2) mode was more sensitive to defects than the L(0,1) mode. Based on the results of the L(0,1) and L(0,2) mode analyses, the magnitude ratio of the two modes was more effective than studying each mode when evaluating defects near the welded zone of stainless steel because of its linear relationship with the length of the artificial defect.

  2. Advanced radiator concepts utilizing honeycomb panel heat pipes (stainless steel)

    Science.gov (United States)

    Fleischman, G. L.; Tanzer, H. J.

    1985-08-01

    The feasibility of fabricating and processing moderate temperature range heat pipes in a low mass honeycomb sandwich panel configuration for highly efficient radiator fins for the NASA space station was investigated. A variety of honeycomb panel facesheet and core-ribbon wick concepts were evaluated within constraints dictated by existing manufacturing technology and equipment. Concepts evaluated include: type of material, material and panel thicknesses, wick type and manufacturability, liquid and vapor communication among honeycomb cells, and liquid flow return from condenser to evaporator facesheet areas. In addition, the overall performance of the honeycomb panel heat pipe was evaluated analytically.

  3. Study on Snow-Melting System around Steel Top of Underground Fire Cistern using Heat Pipe

    Science.gov (United States)

    Nagai, Niro; Nakano, Norimasa; Takeuchi, Masanori; Maekawa, Yoshitaka; Maegawa, Yoshikazu

    This research aims to develop snow melting system around steel top of underground fire cistern by using heat pipe, for realizing quick finding of the steel top under heavy snow fall. Water in a fire cistern installed underground is heated by underground heat source, 10 ~15 °C. The iron top is put on snow melting panel made of reinforced concrete. Heat is transported from water to the snow melting panel by heat pipes, which melts snow on it. The experimental results obtained for two years show that this system can melt the snow around the steel top in winter season preferably. The numerical simulation using only weather data was found to predict temperature variations of the whole system with good agreements to the experimental data. Therefore, this simulation software can be used for designing this snow-melting system.

  4. X-ray diffraction study of microstructural changes during fatigue damage initiation in steel pipes

    Energy Technology Data Exchange (ETDEWEB)

    Pinheiro, B., E-mail: bianca@lts.coppe.ufrj.br [Laboratory of Mechanics of Lille (LML), UMR CNRS 8107, University of Lille 1, Boulevard Paul Langevin, Cite Scientifique, 59655 Villeneuve d' Ascq (France); Lesage, J. [Laboratory of Mechanics of Lille (LML), UMR CNRS 8107, University of Lille 1, Boulevard Paul Langevin, Cite Scientifique, 59655 Villeneuve d' Ascq (France); Pasqualino, I. [Subsea Technology Laboratory (LTS), Ocean Engineering Department, COPPE/Federal University of Rio de Janeiro, PO Box 68508, Cidade Universitaria, CEP 21945-970, Rio de Janeiro/RJ (Brazil); Benseddiq, N. [Laboratory of Mechanics of Lille (LML), UMR CNRS 8107, University of Lille 1, Boulevard Paul Langevin, Cite Scientifique, 59655 Villeneuve d' Ascq (France); Bemporad, E. [Interdepartmental Laboratory of Electron Microscopy (LIME), University of Rome TRE, Via Della Vasca Navale 79, 00146 Rome (Italy)

    2012-01-15

    Highlights: Black-Right-Pointing-Pointer In this work we study the fatigue damage evolution in an API 5L X60 steel. Black-Right-Pointing-Pointer Microstructural changes and residual stresses are evaluated during fatigue tests. Black-Right-Pointing-Pointer Microdeformations and macro residual stresses are estimated by X-ray diffraction. Black-Right-Pointing-Pointer Results are discussed in view of an indicator of fatigue damage initiation. Black-Right-Pointing-Pointer This indicator could allow the prediction of residual life before macrocracking. - Abstract: Steel pipes used in the oil and gas industry undergo the action of cyclic loads that can cause their failure by fatigue. A consistent evaluation of the fatigue damage during the initiation phase should fundamentally be based on a nanoscale approach, i.e., at the scale of the dislocation network, in order to take into account the micromechanisms of fatigue damage that precede macrocrack initiation and propagation until the final fracture. In this work, microstructural changes related to fatigue damage initiation are investigated in the API 5L X60 grade steel, used in pipe manufacturing. Microdeformations and macro residual stress are evaluated using X-ray diffraction in real time during alternating bending fatigue tests performed on samples cut off from an X60 steel pipe. The aim of this ongoing work is to provide ground for further development of an indicator of fatigue damage initiation in X60 steel. This damage indicator could allow a good residual life prediction of steel pipes previously submitted to fatigue loading, before macroscopic cracking, and help to increase the reliability of these structures.

  5. Modeling of residual stress mitigation in austenitic stainless steel pipe girth weldment

    Energy Technology Data Exchange (ETDEWEB)

    Li, M.; Atteridge, D.G.; Anderson, W.E. [Oregon Graduate Inst., Portland, OR (United States); West, S.L. [Westinghouse Savannah River Co., Aiken, SC (United States)

    1994-03-01

    This study provides numerical procedures to model 40-cm-diameter, schedule 40, Type 304L stainless steel pipe girth welding and a newly proposed post-weld treatment. The treatment can be used to accomplish the goal of imparting compressive residual stresses at the inner surface of a pipe girth weldment to prevent/retard the intergranular stress corrosion cracking (IGSCC) of the piping system in nuclear reactors. This new post-weld treatment for mitigating residual stresses is cooling stress improvement (CSI). The concept of CSI is to establish and maintain a certain temperature gradient across the pipe wall thickness to change the final stress state. Thus, this process involves sub-zero low temperature cooling of the inner pipe surface of a completed girth weldment, while simultaneously keeping the outer pipe surface at a slightly elevated temperature with the help of a certain heating method. Analyses to obtain quantitative results on pipe girth welding and CSI by using a thermo-elastic-plastic finite element model are described in this paper. Results demonstrate the potential effectiveness of CSI for introducing compressive residual stresses to prevent/retard IGSCC. Because of the symmetric nature of CSI, it shows great potential for industrial application.

  6. The Monster Sound Pipe

    Science.gov (United States)

    Ruiz, Michael J.; Perkins, James

    2017-01-01

    Producing a deep bass tone by striking a large 3 m (10 ft) flexible corrugated drainage pipe immediately grabs student attention. The fundamental pitch of the corrugated tube is found to be a semitone lower than a non-corrugated smooth pipe of the same length. A video (https://youtu.be/FU7a9d7N60Y) of the demonstration is included, which…

  7. Corrosion by concentrated sulfuric acid in carbon steel pipes and tanks: state of the art

    Energy Technology Data Exchange (ETDEWEB)

    Panossian, Zehbour; Almeida, Neusvaldo Lira de; Sousa, Raquel Maria Ferreira de [Instituto de Pesquisas Tecnologicas (IPT), Sao Paulo, SP (Brazil); Pimenta, Gutemberg de Souza [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil). Centro de Pesquisas e Desenvolvimento (CENPES); Marques, Leandro Bordalo Schmidt [PETROBRAS Engenharia, Rio de Janeiro, RJ (Brazil)

    2009-07-01

    PETROBRAS, allied to the policy of reduction of emission of pollutants, has been adjusting the processes of the new refineries to obtain products with lower sulfur content. Thus, the sulfur dioxide, extracted from the process gases of a new refinery to be built in the Northeast, will be used to produce sulfuric acid with concentration between (94-96) %. This acid will be stored in carbon steel tanks and transported through a buried 8-km carbon steel pipe from the refinery to a pier, where it will be loaded onto ships and sent to the consumer markets. Therefore, the corrosion resistance of carbon steel by concentrated acid will become a great concern for the mentioned storage and transportation. When the carbon steel comes into contact with concentrated sulfuric acid, there is an immediate acid attack with the formation of hydrogen gas and ferrous ions which, in turn, forms a protective layer of FeSO{sub 4} on the metallic surface. The durability of the tanks and pipes made of carbon steel will depend on the preservation of this protective layer. This work presents a review of the carbon steel corrosion in concentrated sulfuric acid and discusses the preventive methods against this corrosion, including anodic protection. (author)

  8. Transient Response to Rapid Cooling of a Stainless Steel Sodium Heat Pipe

    Science.gov (United States)

    Mireles, Omar R.; Houts, Michael G.

    2011-01-01

    Compact fission power systems are under consideration for use in long duration space exploration missions. Power demands on the order of 500 W, to 5 kW, will be required for up to 15 years of continuous service. One such small reactor design consists of a fast spectrum reactor cooled with an array of in-core alkali metal heat pipes coupled to thermoelectric or Stirling power conversion systems. Heat pipes advantageous attributes include a simplistic design, lack of moving parts, and well understood behavior. Concerns over reactor transients induced by heat pipe instability as a function of extreme thermal transients require experimental investigations. One particular concern is rapid cooling of the heat pipe condenser that would propagate to cool the evaporator. Rapid cooling of the reactor core beyond acceptable design limits could possibly induce unintended reactor control issues. This paper discusses a series of experimental demonstrations where a heat pipe operating at near prototypic conditions experienced rapid cooling of the condenser. The condenser section of a stainless steel sodium heat pipe was enclosed within a heat exchanger. The heat pipe - heat exchanger assembly was housed within a vacuum chamber held at a pressure of 50 Torr of helium. The heat pipe was brought to steady state operating conditions using graphite resistance heaters then cooled by a high flow of gaseous nitrogen through the heat exchanger. Subsequent thermal transient behavior was characterized by performing an energy balance using temperature, pressure and flow rate data obtained throughout the tests. Results indicate the degree of temperature change that results from a rapid cooling scenario will not significantly influence thermal stability of an operating heat pipe, even under extreme condenser cooling conditions.

  9. Study on Laser Visual Measurement Method for Seamless Steel PipeStraightness Error by Multiple Line-structured Laser Sensors

    Institute of Scientific and Technical Information of China (English)

    陈长水; 谢建平; 王佩琳

    2001-01-01

    An original non-contact measurement method using multiple line-structured laser sensors is introduced for seamless steel pipe straightness error is in this paper. An arc appears on the surface of the measured seamless steel pipe against a line-structured laser source. After the image of the arc is accepted by a CCD camera, the coordinates of the center of the pipe cross-section circle containing the arc can be worked out through a certain algorithm. Similarly, multiple line-structured laser sensors are equipped parallel to the pipe. The straightness error of the seamless steel pipe, therefore, can be inferred from the coordinates of multiple cross-section centers obtained from every line-structured laser sernsor .

  10. Cathodic corrosion protection of steel pipes; Kathodischer Korrosionsschutz von Rohrleitungsstaehlen

    Energy Technology Data Exchange (ETDEWEB)

    Buechler, Markus [SGK Schweizerische Gesellschaft fuer Korrosionsschutz, Zuerich (Switzerland); Schoeneich, Hanns-Georg [Open Grid Europe, Essen (Germany)

    2011-07-01

    The cathodic corrosion protection has been proven excellently in the practical use for buried steel pipelines. This is evidenced statistically by a significantly less frequency of loss compared to non-cathodically protected pipelines. Based on thermodynamic considerations, the authors of the contribution under consideration describe the operation of the cathodic corrosion protection and regular adjustment of the electrochemical potential at the interface steel / soil in practical use. Subsequently, the corrosion scenarios are discussed that may occur when an incorrect setting of the potential results from an operation over several decades. This incorrect setting also can be caused by the failure of individual components of the corrosion protection.

  11. THE EXTENDED FINITE ELEMENT METHOD IN FATIGUE LIFE PREDICTIONS OF OIL WELL WELDED PIPES MADE OF API J55 STEEL

    National Research Council Canada - National Science Library

    Ljubica Lazic Vulicevic; Aleksandar Grbovic; Aleksandar Sedmak; Aleksandar Rajic

    2015-01-01

      This paper presents an application of the extended finite element method (XFEM) in the modeling and analysis of simultaneous cracks propagations in a seam casing pipe made of API J55 steel by high-frequency...

  12. Hydrogen-related stress corrosion cracking in line pipe steel

    DEFF Research Database (Denmark)

    Nielsen, Lars Vendelbo

    1997-01-01

    A correlation between hydrogen concentration (C0) and the critical stress intensity factor for propagation of hydrogen-related cracks has been established by fracture mechanical testing of CT-specimens for the heat affected zone of an X-70 pipeline steel. This has been compared with field...

  13. 75 FR 29972 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe from the People's...

    Science.gov (United States)

    2010-05-28

    ..., regardless of wall-thickness, manufacturing process (e.g., hot-finished or cold-drawn), end finish (e.g...) pipe or ``hollow profiles'' suitable for cold finishing operations, such as cold drawing, to meet the... International Trade Administration Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe...

  14. Application of FOX-TEK sensors to measure strains in steel pipe with wall thinning defects under internal pressure

    Energy Technology Data Exchange (ETDEWEB)

    Tennyson, R.C.; Lin, W.; Doiron, A. [Natural Resources Canada, Ottawa, ON (Canada)

    2002-06-30

    A project was undertaken as part of the ISPIR program to investigate the application of fiber optic sensing to monitor pipelines. This report discussed the application of FOX-TEK (FT) sensors to measure strains in steel pipe with wall thinning defects under internal pressure. Sensor installation and pipe test results were both discussed. Several illustrations were offered, including the geometry of pipes with internal defects and location of FT sensors; smoothing of the pipe surface prior to bonding sensors; close-up views of 2 FT sensors bonded over defect areas of the steel pipe; an overview of steel pipe with 3 FT sensors; and an internal pressure test of steel pipe with 4 FT sensors connected to an FTI 3300 instrument. FT sensor strain results were plotted for 2 different sized cutouts and a finite element analysis was conducted to calculate the circumferential strain distribution for 24 inch and 4 inch cutouts, with and without the weld seams present. It was concluded that the FT sensors can accurately detect the hoop strains for uniform wall sections, circumferential defect areas and large regions of wall thinning for a pipe under internal pressure. 1 tab., 8 figs.

  15. The First Assembly Line of Large-longitudinally-welded Steel Pipe in China Went into Operation

    Institute of Scientific and Technical Information of China (English)

    Li Bing

    2002-01-01

    @@ On July 27, the first assembly line to produce JCOE large diameter Longitudinally-submerged-arc-welded steel pipe in China, Which is the key homemade equipment project of "West-East Gas Transmission"project, was put into production. Chen Gen, vice general manager of CNPC; Xie Zhiqiang and Liu Haisheng, assistant chief manager of CNPC; Shi Xingquan, vice president of PetroChina; and the president of Itochu-Marubeni Steel & iron Co., Ltd.of Japan; attended the opening ceremony and cut the ribbon.

  16. Study of the Intercrystalline Corrosion in Pipes of Stainless Steel in a Combined Cycle

    Directory of Open Access Journals (Sweden)

    Raúl Andrés Montejo Serrano

    2014-09-01

    Full Text Available The present work is carried out with the purpose of giving answer to the possible presence ofintercrystalline corrosion and its future consequences in the built tubes of stainless steel 304L anddedicated to the conduction from the water to the boilers of a combined cycle of electricity production.The plant is these in this moments in installation of process investor and assembly and this study wasrequested since during the trial of installation of the pipes of stainless steel that will drive the watertried to the steam generators, they were detected on the part of the operatives some imperfections inthe material, what generated the doubt about the possibility of presence of intercrystalline corrosion orof another type in the pipes. After the realized rehearsals according to international norms and alsousing rehearsals metallography you concludes that the material employee is not sensitive to this typeof corrosion.

  17. Experiments of Multi-element Composite Foundation with Steel Pipe Pile and Gravel Pile

    Institute of Scientific and Technical Information of China (English)

    WANG Xian-zhi; ZHENG Jun-jie

    2008-01-01

    A set of self-developed apparatus for foundation physical model were utilized to conduct model tests of the multi-element composite foundation with a steel pipe pile and several gravel piles. Some load-bearing characteristics of the multi-element composite foundation, including the curves of foundation settlement, stresses of piles, pile-soil stress ratio, and load-sharing ratio of piles and soil, were obtained to study its working performances in silty sand soil. The experimental results revealed that the multi-element composite foundation with steel pipe pile and gravel pile contributed more than the gravel pile composite foundation in improving the bearing capacity of the silty fine sand.

  18. Multi-Agent System Supply Chain Management in Steel Pipe Manufacturing

    Directory of Open Access Journals (Sweden)

    S Srinivasan

    2010-07-01

    Full Text Available The proposed work focus large -scale scheduling in the steel pipe industry on the significance and benefits of operating supply chains as an integral part of the modern manufacturing enterprises and also the importance of information sharing as the major requirement for the effective functioning of supply chains. A multi-agent architecture for integrated dynamic scheduling of the steel pipe industry is proposed . The scheduling systems of these processes have different objectives and constraints, and operate in an environment where there is a substantial quantity of real-time information concerning production failures, supplier information , order processing and customer requests. Each process is assigned to an agent who independently, seeks an optimal dynamic schedule at a local level taking into account local objectives, real-time information and information received from other agents. Each agent can react to real-time events in order to fix any problems that occur.

  19. Research for different crack width calculation methods of concrete-lined steel pressure pipe

    Science.gov (United States)

    Xu, Chuang; Li, Yang

    2017-08-01

    Based on a certain threshold to ensure the durability of structure, the concrete-lined steel pressure pipes used in the structure of large hydropower station widely are allowed to exist in concrete cracking under the action of a certain hydraulic pressure. According to the 1:2 large scale experiment model and the measured data of Three Gorges Hydro-power Station, the existing different methods for calculating crack width were compared and improvements and crack control measures were raised.

  20. Fatigue testing of steel pipes repaired with carbon/epoxy composites

    Energy Technology Data Exchange (ETDEWEB)

    Wilson, Jeffrey M.; Kessler, Michael R. [University of Tulsa, OK (United States). Dept. of Mechanical Engineering; Walker, Roger H.; Duell, Joshua M. [Citadel Technologies (CTI Services LLC), Tulsa, OK (United States); Kadakia, Dixit; Sousa, Nuno [T.D. Williamson, Inc., Tulsa, OK (United States)

    2005-07-01

    Fatigue tests were performed on pressure vessels to determine the effectiveness of repairs made using a carbon/epoxy composite material system. The carbon/epoxy system is intended to repair externally damaged or corroded steel pipe where blunt defects are present. 6.0 inch (15.2 cm) nominal diameter by 5.0 feet (1.52 m) long pressure vessels were constructed from A-106 Grade B steel for test purposes. Defects were machined into the outer surface of each vessel to determine limitations of the carbon/epoxy repair system. Two test plans were used in this work. The vessels of the first test plan contained relatively sharp defects and were subjected to internal pressure fluctuations between 13 and 113% of MAOP. The vessels of the second test plan contained more blunt-like defects and were cyclically pressurized from 55 to 100% of the pipe MAOP. Results indicate there is substantial increase in the performance of pipes repaired with the carbon/epoxy composite compared to those with no repairs. At the conclusion of the cyclical pressurization, the pipes with the carbon/epoxy repair were pressurized monotonically until rupture occurred. From the second test plan, the monotonic rupture data after fatigue showed no degradation in failure pressures compared with rupture data of non-fatigued vessels. (author)

  1. A Novel Carbon Steel Pipe Protection Based on Radial Basis Function Neural Network

    Directory of Open Access Journals (Sweden)

    Sami A. Ajeel

    2010-01-01

    Full Text Available Problem statement: The cost due to corrosion Damage have estimated to be 3-4% of their gross national product which significantly Countries problem around the world. Approach: In this study, a novel carbon steel pipe protection based on RBFNN was proposed. The RBFNN used to predict the minimum current density required in impressed current cathodic protection to protect low carbon steel pipe. Learning data was performed by using a 30 samples test with different concentration C%, temperature T, distance D and pH. The RBFNN model has four input nodes representing the (concentration C%, temperature T, distance D and pH, eight nodes at hidden layer and one output node representing the min. current density. Results: Generalization test used 5 data samples taken from the experimental results other than those data samples used in the learning process to check the performance of the neural network on these data. Conclusion: In addition, the experimental results indicate that proposed system can be used successfully to obtain minimum cathodic protection current density to protect low carbon steel pipes.

  2. Special Features of Structure Formation in Pipes from Medium-Carbon Low-Alloy Steel 32G2F Under Heat Treatment

    Science.gov (United States)

    Stepanov, A. I.; Belikov, S. V.; Musikhin, S. A.; Burmasov, S. P.; Popov, A. A.

    2017-03-01

    Special features of formation of structure and properties of seamless pipes from medium-carbon low-alloy steel for oil and gas applications are considered and associated with chemical inhomogeneity of the metal of the pipes.

  3. Effect of heat treatments on the hydrogen embrittlement susceptibility of API X-65 grade line-pipe steel

    Indian Academy of Sciences (India)

    G Ananta Nagu; Amarnath; T K G Namboodhiri

    2003-06-01

    Delayed failure tests were carried out on hydrogen charged API X-65 grade line-pipe steel in as received (controlled rolled), normalized, and quenched and tempered conditions. The resistance to hydrogen embrittlement was found in the order of controlled rolled $\\gt$ quenched and tempered $\\gt$ normalized. The fracture mode in the hydrogen embrittled steel was ductile.

  4. 75 FR 57444 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe from the People's...

    Science.gov (United States)

    2010-09-21

    ... (other than stainless steel) pipe or ``hollow profiles'' suitable for cold finishing operations, such as cold drawing, to meet the American Society for Testing and Materials (``ASTM'') or American Petroleum... to this scope is dispositive. Scope Comments On May 26, 2010, Salem Steel, a U.S. importer of cold...

  5. Heat Transfer Modeling of an Annular On-Line Spray Water Cooling Process for Electric-Resistance-Welded Steel Pipe.

    Science.gov (United States)

    Chen, Zejun; Han, Huiquan; Ren, Wei; Huang, Guangjie

    2015-01-01

    On-line spray water cooling (OSWC) of electric-resistance-welded (ERW) steel pipes can replace the conventional off-line heat treatment process and become an important and critical procedure. The OSWC process improves production efficiency, decreases costs, and enhances the mechanical properties of ERW steel pipe, especially the impact properties of the weld joint. In this paper, an annular OSWC process is investigated based on an experimental simulation platform that can obtain precise real-time measurements of the temperature of the pipe, the water pressure and flux, etc. The effects of the modes of annular spray water cooling and related cooling parameters on the mechanical properties of the pipe are investigated. The temperature evolutions of the inner and outer walls of the pipe are measured during the spray water cooling process, and the uniformity of mechanical properties along the circumferential and longitudinal directions is investigated. A heat transfer coefficient model of spray water cooling is developed based on measured temperature data in conjunction with simulation using the finite element method. Industrial tests prove the validity of the heat transfer model of a steel pipe undergoing spray water cooling. The research results can provide a basis for the industrial application of the OSWC process in the production of ERW steel pipes.

  6. Heat Transfer Modeling of an Annular On-Line Spray Water Cooling Process for Electric-Resistance-Welded Steel Pipe

    Science.gov (United States)

    Chen, Zejun; Han, Huiquan; Ren, Wei; Huang, Guangjie

    2015-01-01

    On-line spray water cooling (OSWC) of electric-resistance-welded (ERW) steel pipes can replace the conventional off-line heat treatment process and become an important and critical procedure. The OSWC process improves production efficiency, decreases costs, and enhances the mechanical properties of ERW steel pipe, especially the impact properties of the weld joint. In this paper, an annular OSWC process is investigated based on an experimental simulation platform that can obtain precise real-time measurements of the temperature of the pipe, the water pressure and flux, etc. The effects of the modes of annular spray water cooling and related cooling parameters on the mechanical properties of the pipe are investigated. The temperature evolutions of the inner and outer walls of the pipe are measured during the spray water cooling process, and the uniformity of mechanical properties along the circumferential and longitudinal directions is investigated. A heat transfer coefficient model of spray water cooling is developed based on measured temperature data in conjunction with simulation using the finite element method. Industrial tests prove the validity of the heat transfer model of a steel pipe undergoing spray water cooling. The research results can provide a basis for the industrial application of the OSWC process in the production of ERW steel pipes. PMID:26201073

  7. Experimentation and numerical simulation of steel fibre reinforced concrete pipes

    Directory of Open Access Journals (Sweden)

    de la Fuente, Albert

    2011-06-01

    Full Text Available The results concerning on an experimental and a numerical study related to SFRCP are presented. Eighteen pipes with an internal diameter of 600 mm and fibre dosages of 10, 20 and 40 kg/m3 were manufactured and tested. Some technological aspects were concluded. Likewise, a numerical parameterized model was implemented. With this model, the simulation of the resistant behaviour of SFRCP can be performed. In this sense, the results experimentally obtained were contrasted with those suggested by means MAP reaching very satisfactory correlations. Taking it into account, it could be said that the numerical model is a useful tool for the optimal design of the SFRCP fibre dosages, avoiding the need of the systematic employment of the test as an indirect design method. Consequently, the use of this model would reduce the overall cost of the pipes and would give fibres a boost as a solution for this structural typology.

    En este artículo se presentan los resultados principales de un estudio experimental y numérico del comportamiento de tubos hormigón reforzado con fibras de acero (THFA. Se fabricaron y ensayaron 18 tubos de 600 mm de diámetro con cuantías de 10, 20 y 40 kg/m3 de fibras, concluyéndose varios aspectos tecnológicos relacionados con la fabricación y el ensayo así como del comportamiento resistente. Por otra parte, se ha desarrollado el modelo numérico MAP que permite la simulación del comportamiento resistente de THFA sometidos al ensayo de aplastamiento. Los resultados han sido satisfactorios para cualquier régimen de carga, permitiendo concluir que el modelo es una herramienta útil para el diseño óptimo de este tipo de tubos. Se concluye que el uso del modelo conduce a una reducción del coste del armado y da un impulso al uso de fibras como elemento de refuerzo en esta tipología estructural.

  8. Modeling of waste heat recovery by looped water-in-steel heat pipes

    Energy Technology Data Exchange (ETDEWEB)

    Akyurt, M.; Lamfon, N.J.; Najjar, Y.S.H.; Habeebullah, M.H.; Alp, T.Y. [King Abdulaziz Univ., Jeddah (Saudi Arabia). College of Engineering

    1995-08-01

    Modeling and simulation of a water-in-steel heat pipe heat recovery system is undertaken in this paper. The heat recovery system consists of a looped two-phase thermosyphon that receives heat from the stack of a gas turbine engine and delivers it to the generator of an NH{sub 3}-H{sub 2}O absorption chiller. Variations in the operating temperature as well as evaporator geometry are investigated, and the consequences on system effectiveness are studied. It is concluded that the model for the water-in-steel looped thermosyphon overcomes drawbacks of the water-in-copper thermosyphon, and that the steel system is simpler in design, lower in cost, and more competent in performance. (author)

  9. Internal corrosion of carbon steel piping in hot aquifers service

    Directory of Open Access Journals (Sweden)

    Simičić Miloš V.

    2011-01-01

    Full Text Available Internal corrosion of carbon steel pipelines is a major problem encountered in water service. In terms of prediction of the remaining lifetime for water pipelines based on the corrosion allowance, the three main approaches are corrosion modelling, corrosion inhibitor availability, and corrosion monitoring. In this study we used two theoretical corrosion models, CASSANDRA and NORSOK M-506 of quite different origin in order to predict uniform corrosivity of hot aquifers in eight different pipelines. Because of the varying calculation criteria for the different models, these can give very different corrosion rate predictions for the same data input. This is especially true under conditions where the formation of protective films may occur, such as at elevated temperatures. The evaluation of models was conducted by comparison using weight-loss coupons and three corrosion inhibitors were obtained from commercial suppliers. The tests were performed during the 60-day period. Even though inhibitors’ efficiencies of 98% had been achieved in laboratory testing, inhibitors’ availabilities of 85% have been used due to logistics problems and other issues. The results, given in mmpy, i.e. millimeter per year, are very consistent with NORSOK M-506 prediction. This is presumably because the model considers the effect of the formation of a passive iron carbonate film at temperatures above 80 °C and significant reduction in corrosion rate. Corrosion inhibitor A showed a better performance than inhibitors B and C in all cases but the target corrosion rates of less than 0.1 mmpy were achieved for all inhibitors. The chemical type of corrosion inhibitor A is based on quaternary amines mixed with methanol, isopropyl alcohol, xylene and ethylbenzene. Based on the obtained results the carbon steel lifetime of 30 years, provided proper inhibitors are present and 3mm corrosion allowance, can be achieved for hot aquifers service with presented water compositions.

  10. Numerical study on forming complex fitting body on end of integrated stainless steel pipe without welds

    Institute of Scientific and Technical Information of China (English)

    张大伟; 赵升吨

    2016-01-01

    It is necessary to use the integrated stainless steel pipe having two fitting bodies without welds while train travelling at high speed. In order to form this type of integrated stainless steel pipe, the method of preforming combined finish forming process is developed. The preforming process is characterized by flaring combined upsetting for left fitting body which is like a flange, and is characterized by tube axial compressive process under die constraint for right fitting body which is like a double-wall pipe. The finite element simulations of the processes are carried out by software package DEFORM, and the results indicate that: 1) left or right fitting body can be formed by a two-step forming process without folding and under-filling defects; 2) by using two-step forming, strain and stress in left fitting body are larger than those in right fitting body, and deformation in right fitting body is more homogenous than the deformation in left fitting body; 3) two or more preforming steps may be needed for left fitting body considering the distributions of strain and stress.

  11. The monster sound pipe

    Science.gov (United States)

    Ruiz, Michael J.; Perkins, James

    2017-03-01

    Producing a deep bass tone by striking a large 3 m (10 ft) flexible corrugated drainage pipe immediately grabs student attention. The fundamental pitch of the corrugated tube is found to be a semitone lower than a non-corrugated smooth pipe of the same length. A video (https://youtu.be/FU7a9d7N60Y) of the demonstration is included, which illustrates how an Internet keyboard can be used to estimate the fundamental pitches of each pipe. Since both pipes have similar end corrections, the pitch discrepancy between the smooth pipe and drainage tube is due to the corrugations, which lower the speed of sound inside the flexible tube, dropping its pitch a semitone.

  12. Mechanism of selective corrosion in electrical resistance seam welded carbon steel pipe

    Energy Technology Data Exchange (ETDEWEB)

    Lopez Fajardo, Pedro; Godinez Salcedo, Jesus; Gonzalez Velasquez, Jorge L. [Instituto Politecnico Nacional, Mexico D.F., (Mexico). Escuela Superior de Ingenieria Quimica e Industrias Extractivas. Dept. de Ingenieria Metalurgica

    2009-07-01

    In this investigation the studies of the mechanism of selective corrosion in electrical resistance welded (ERW) carbon steel pipe was started. Metallographic characterizations and evaluations for inclusions were performed. The susceptibility of ERW pipe to selective corrosion in sea water (NACE 1D182, with O{sub 2} or CO{sub 2} + H{sub 2}S) was studied by the stepped potential Potentiostatic electrochemical test method in samples of 1 cm{sup 3} (ASTM G5) internal surface of the pipe (metal base-weld). The tests were looking for means for predicting the susceptibility of ERW pipe to selective corrosion, prior to placing the pipeline in service. Manganese sulfide inclusions are observed deformed by the welding process and they are close to the weld centerline. A slight decarburization at the weld line is observed, and a distinct out bent fiber pattern remains despite the post-weld seam annealing. The microstructure of the weld region consists of primarily polygonal ferrite grains mixed with small islands of pearlite. It is possible to observe the differences of sizes of grain of the present phases in the different zones. Finally, scanning electron microscopic observation revealed that the corrosion initiates with the dissolution of MnS inclusions and with small crack between the base metal and ZAC. (author)

  13. Prediction of Welding Residual Stress in 2. 25Cr-1Mo Steel Pipe

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    A numerical analysis method was proposed to predict the welding residual stress in 2.25Cr-1Mo steel pipe considering solid-state phase transformations. A thermal elastic plastic finite element (FE) model considering effects of martensite transformation was developed based on commercial ABAQUS software. Continuous cooling transformation (CCT) diagrams were employed to simulate the fraction of martensite in fusion zone, coarsegrained heat affected zone and fine-grained heat affected zone. The Koistinen-Marburger relationship was used to trace the formation of martensite. The effects of both volume change and yield strength change due to phase transformation on welding residual stress were considered using the proposed FE model. The result shows that the phase transformation has significant effects on the welding residual stress in multi-pass butt weld of pipe. The predicted simulation results by the proposed numerical method are generally in good agreement with experimental results.

  14. A study of ceramic-lined composite steel pipes prepared by SHS centrifugal-thermite process

    Directory of Open Access Journals (Sweden)

    Li Yuxin

    2016-01-01

    Full Text Available Al2O3 ceramic-lined steel pipe was produced by self-propagating high-temperature synthesis centrifugal thermite process (SHS C-T process from Fe2O3 and Al as the raw materials. The composition, phase separation and microstructures were investigated. The result showed the ceramic lined pipe is composed of the three main layers of various compositions, which were subsequently determined to be Fe layer, the transition layer and the ceramic layer. Fe layer is composed of austenite and ferrite, the transition layer consisted of Al2O3 ceramic and Fe, the ceramic layer consisted of the dendritic-shaped Al2O3 and the spinel-shaped structured FeAl2O4.

  15. 地铁不锈钢车体波纹板缝焊工艺分析%Seam Welding Process Analysis of Metro Stainless Steel Car-body Corrugated Sheet

    Institute of Scientific and Technical Information of China (English)

    张健涌

    2016-01-01

    基于缝焊焊接方式的原理,结合公司新购的UICS -280-13型不锈钢波纹板缝焊机系统特性,根据不锈钢车体波纹板材料、规格、制造要求等特点,分析地铁不锈钢车体波纹板的缝焊焊接工艺。%Base on the principle of seam welding,combined with the system characteristics of the UICS-280-13 seam welding equipment,according to the material,specification,and manufacture requirement of corrugated sheet,this paper analyzes the seam welding process of the metro stainless steel car-body corrugated sheet.

  16. The influence of the residual copper on the pipes steel hot plasticity according to environmental requirements

    Directory of Open Access Journals (Sweden)

    Rusănescu C.O.

    2013-01-01

    Full Text Available Considering the importance of gaseous and/or liquid fuels impact on the environment, the resistance of pipelines at hot plastic deformation is important. Therefore, in order to avoid or reduce any adverse impact on the environment, the influence of residual copper on hot deformability of steel pipes was investigated in this paper. The negative copper influence was experimentally proved using torsion deformation at temperatures above 1000o, under the air and argon atmosphere. The samples were heated and then deformed at different temperatures with constant deformation rate. Also, structural analysis of investigated materials was done, using metallographic and SEM analysis.

  17. Finite element analysis of fibre augmented steel technology pipe (FAST-PIPEtm)

    Energy Technology Data Exchange (ETDEWEB)

    Chen, Qishi; Yoosef-Ghodsi, Nader [C-FER Technologies, Edmonton, Alberta, (Canada); Salama, Mamdouh [ConocoPhillips Company, Houston, Texas, (United States)

    2010-07-01

    FAST-PipeTM is fabricated from a steel liner hoop-wound with non-impregnated fibreglass strands. The design of this new technology requires developing analytical methods. This paper reported how the finite element program ABAQUS has been used to develop shell models capable of simulating the burst and bending behaviour of FAST-PIPETM. Experimental measurements were performed on 48 and 12 inch pipes to calibrate and to validate the finite element analysis models. The material properties were obtained using coupon tests, and the elastic modulus of the fibre wrap using burst tests. The results showed that the failure of both the burst and bend models was defined as the point where the wrap hoop strain reached a failure strain of about 2%. It is found that the analytical model was accurate based on the burst test results. Also, the moment capacity is not affected by the wrap elasticity modulus value and the type of yield criteria used for the steel liner.

  18. A Model for Predicting the Yield Strength Difference between Pipe and Plate of Low-Carbon Microalloyed Steel

    Science.gov (United States)

    Zhang, Wenlong; Ding, Dongyan; Gu, Mingyuan

    2012-12-01

    A combination of finite-element calculation and tension-compression tests was employed to predict the yield strength difference between the pipe and plate of low-carbon microalloyed steel (LCMS) in the production of high-frequency straight bead welding pipes (HFSBWPs). The deformation process was divided into bending, flattening, and tension deformations. The bending and flattening deformations were simulated using a finite-element method in order to obtain circumferential strains at pipe wall positions along the wall thickness. These strains were the transition strains in the subsequent tension-compression-tension and compression-tension tests. The yield stresses (0.5 pct proof stresses) at the pipe wall positions were derived from the obtained stress-strain curves. The average of the obtained yield stresses was taken as the predicted yield strength of the pipes. It is found that the difference between the latter and the strength of the original steel plates is a result of the combined action of the Bauschinger effect and strain hardening caused by bending and reverse bending deformations. It is strongly dependent on the ratio of pipe wall thickness to pipe outer diameter ( T/D ratio). At low T/D ratios, the Bauschinger effect was dominant, resulting in a decreased yield strength. Strain hardening due to work hardening was dominant at higher T/D ratios, resulting in an increased yield strength. The increase in yield strength was greater at the inner pipe walls than at outer ones, indicating that strain hardening is stronger at inner pipe walls. The yield strength differences predicted with the presented approach are comparable with the values obtained from industrial productions of HFSBWPs, indicating that this approach can be used to predict the yield strength difference between pipe and plate of LCMS.

  19. Round robin analysis on stress intensity factor of inner surface cracks in welded stainless steel pipes

    Energy Technology Data Exchange (ETDEWEB)

    Han, Chang Gi; Chang, Yoon Suk [Dept. of Nuclear Engineering, College of Engineering, Kyung Hee University, Yongin (Korea, Republic of); Kim, Jong Sung [Dept. of Mechanical Engineering, Sunchon National University, Sunchon (Korea, Republic of); Kim, Maan Won [Central Research Institute, Korea Hydro and Nuclear Power Company, Daejeon (Korea, Republic of)

    2016-12-15

    Austenitic stainless steels (ASSs) are widely used for nuclear pipes as they exhibit a good combination of mechanical properties and corrosion resistance. However, high tensile residual stresses may occur in ASS welds because postweld heat treatment is not generally conducted in order to avoid sensitization, which causes a stress corrosion crack. In this study, round robin analyses on stress intensity factors (SIFs) were carried out to examine the appropriateness of structural integrity assessment methods for ASS pipe welds with two types of circumferential cracks. Typical stress profiles were generated from finite element analyses by considering residual stresses and normal operating conditions. Then, SIFs of cracked ASS pipes were determined by analytical equations represented in fitness-for-service assessment codes as well as reference finite element analyses. The discrepancies of estimated SIFs among round robin participants were confirmed due to different assessment procedures and relevant considerations, as well as the mistakes of participants. The effects of uncertainty factors on SIFs were deducted from sensitivity analyses and, based on the similarity and conservatism compared with detailed finite element analysis results, the R6 code, taking into account the applied internal pressure and combination of stress components, was recommended as the optimum procedure for SIF estimation.

  20. Round Robin Analyses on Stress Intensity Factors of Inner Surface Cracks in Welded Stainless Steel Pipes

    Directory of Open Access Journals (Sweden)

    Chang-Gi Han

    2016-12-01

    Full Text Available Austenitic stainless steels (ASSs are widely used for nuclear pipes as they exhibit a good combination of mechanical properties and corrosion resistance. However, high tensile residual stresses may occur in ASS welds because postweld heat treatment is not generally conducted in order to avoid sensitization, which causes a stress corrosion crack. In this study, round robin analyses on stress intensity factors (SIFs were carried out to examine the appropriateness of structural integrity assessment methods for ASS pipe welds with two types of circumferential cracks. Typical stress profiles were generated from finite element analyses by considering residual stresses and normal operating conditions. Then, SIFs of cracked ASS pipes were determined by analytical equations represented in fitness-for-service assessment codes as well as reference finite element analyses. The discrepancies of estimated SIFs among round robin participants were confirmed due to different assessment procedures and relevant considerations, as well as the mistakes of participants. The effects of uncertainty factors on SIFs were deducted from sensitivity analyses and, based on the similarity and conservatism compared with detailed finite element analysis results, the R6 code, taking into account the applied internal pressure and combination of stress components, was recommended as the optimum procedure for SIF estimation.

  1. Corrosion resistance of AISI 304 and 444 stainless steel pipes in sanitizing solutions of clean-in-place process

    OpenAIRE

    Lins,Vanessa de Freitas Cunha; Gonçalves,Giselle Aline dos Santos; Leão,Tiago Paschoalin; Soares,Renata Braga; Costa,Cíntia Gonçalves Fonseca; Viana,Adolfo Kalergis do Nascimento

    2016-01-01

    Stainless steel (SS) is successfully used in food industries due to the characteristics of its surface, which is essential for the maintenance of the properties of food. Tanks and stainless steel pipes, which come into direct contact with food and drink, undergo a process of cleaning and disinfecting called CIP (Clean-in-Place). This method consists of automatic recirculation of a detergent solution for a controlled time followed by a rinsing with water, and finally a cleaning and sanitizing ...

  2. DYNAMIC PROPERTIES OF CORRUGATED-PIPE TYPE SALiM VIBRATION ISOLATOR%波纹管式液固混合介质隔振器的动力学特性

    Institute of Scientific and Technical Information of China (English)

    高雪; 陈前; 滕汉东

    2011-01-01

    波纹管式液固混合介质隔振器是一种主要用于低频重载动力机械隔振的新型隔振器,主要由波纹管弹性单元体和多层波纹管容器组成.首先建立了弹性单元体的弹性板壳模型,在考虑波纹管结构几何非线性及内部气体耦合的前提下,利用参数摄动法推导了单元体在外部油压和内部气压共同作用下的非线性轴向刚度.在此基础上,推导了隔振器的轴向刚度,发现刚度具有分段线性一非线性的特点,并且与弹性单元体和波纹管容器的各参数密切相关.进而建立了等效的分段双线性隔振系统的动力学方程,利用平均法与数值仿真分析了隔振系统的非线性频响特性,结果表明系统具有软弹簧特性,而主共振稳态幅值关于频率的分岔会导致幅值跳跃现象的出现.%Corrugated-pipe type solid and liquid mixture vibration isolator (SALiM) is a new type of isolator for vibration isolation of heavy equipment with low frequency. Firstly, this paper establishes the mechanics model of elastic solid elements by introducing plate-shell model. Based on geometry nonlinearity of corrugated-pipe, the stiffness of the element under outer liquid pressure and inner air pressure can be obtained by the perturbation method. Then the stiffness of isolator is derived and analyzed, and as a result, the stiffness is piecewise nonlinear and determined by parameters of the solid elements and corrugated-pipe container. In addition, the equation of motion of a single degree of freedom system is given, which consists of a SALiM vibration isolator and mechanical equipment. The properties of the frequency response function of the system are analyzed using average method which is a classical analytic method for solving nonlinear differential equations. And it is found that this system with SALiM isolator shows softening stiffness behaviour. The jumping phenomenon clearly occurs under certain

  3. Application of cyclic J-integral to low cycle fatigue crack growth of Japanese carbon steel pipe

    Energy Technology Data Exchange (ETDEWEB)

    Miura, N.; Fujioka, T.; Kashima, K. [and others

    1997-04-01

    Piping for LWR power plants is required to satisfy the LBB concept for postulated (not actual) defects. With this in mind, research has so far been conducted on the fatigue crack growth under cyclic loading, and on the ductile crack growth under excessive loading. It is important, however, for the evaluation of the piping structural integrity under seismic loading condition, to understand the fracture behavior under dynamic and cyclic loading conditions, that accompanies large-scale yielding. CRIEPI together with Hitachi have started a collaborative research program on dynamic and/or cyclic fracture of Japanese carbon steel (STS410) pipes in 1991. Fundamental tensile property tests were conducted to examine the effect of strain rate on tensile properties. Cracked pipe fracture tests under some loading conditions were also performed to investigate the effect of dynamic and/or cyclic loading on fracture behavior. Based on the analytical considerations for the above tests, the method to evaluate the failure life for a cracked pipe under cyclic loading was developed and verified. Cyclic J-integral was introduced to predict cyclic crack growth up to failure. This report presents the results of tensile property tests, cracked pipe fracture tests, and failure life analysis. The proposed method was applied to the cracked pipe fracture tests. The effect of dynamic and/or cyclic loading on pipe fracture was also investigated.

  4. [Corrosion of stainless steel 201, 304 and 316L in the simulated sewage pipes reactor].

    Science.gov (United States)

    Bao, Guo-Dong; Zuo, Jian-E; Wang, Ya-Jiao; Gan, Li-Li

    2014-08-01

    The corrosion behavior of stainless steel 201, 304 and 316L which would be used as sewer in-situ rehabilitation materials was studied in the simulated sewage pipes reactor. The corrosion potential and corrosion rate of these three materials were studied by potentiodynamic method on the 7th, 14th, 21st, 56th day under two different conditions which were full immersion condition or batch immersion condition with a 2-day cycle. The electrode process was studied by Electrochemical Impedance Spectroscopy (EIS) on the 56th day. The microstructure and composition of the corrosion pitting were analyzed by Scanning Electron Microscope (SEM) and Energy Dispersive Spectrometer (EDS) on the 56th day. The results showed that 304 and 316L had much better corrosion resistance than 201 under both conditions. 304 and 316L had much smaller corrosion rate than 201 under both conditions. The corrosion resistance of all three kinds of stainless steel under the batch immersion condition was much better than those under the full immersion condition. The corrosion rate of all three kinds of stainless steel under the batch immersion condition was much smaller than those under the full immersion condition. Point pitting corrosion was formed on the surfaces of 304 and 316L. In comparison, a large area of corrosion was formed in the surface of 201.

  5. Study of pitting corrosion in line-pipe steel under the influence of remanent magnetization

    Energy Technology Data Exchange (ETDEWEB)

    Espina-Hernandez, J.H.; Caleyo, F.; Hallen, J.M. [Instituto Politecnico Nacional (IPN), Zacatenco (Mexico)

    2009-07-01

    The influence of remanent magnetization on pitting corrosion in line-pipe steels is studied. Pitting corrosion experiments have been carried out on samples of an API 5L grade 52 steel under a magnetization level of the same order of magnitude of the remanent magnetization in the pipeline wall after in-line inspection based on magnetic flux leakage. The samples were magnetized using rings of the same grade as the investigated steel. Immediately after magnetization, the investigated samples were subjected to pitting by immersing them in a solution containing dissolved Cl{sup -} and SO{sup 2-}{sub 4} and ions. The pitting experiments were conducted during a seven days period. The pit depth distribution and the maximum pit depth in each sample were recorded and used to conduct extreme value analyses of the pitting process in magnetized and non-magnetized control samples. The statistical assessment of the pitting corrosion data collected during this study shows that the magnetic field reduces the average depth of the pit population and also the extreme pit depth values that can be predicted from the maximum values observed in the magnetized samples in comparison with to the non-magnetized control samples. Scanning electron microscopy observations show that the magnetic field alters the pit morphology by increasing the pit mouth opening. (author)

  6. Study of pitting corrosion in line-pipe steel under the influence of remanent magnetization

    Energy Technology Data Exchange (ETDEWEB)

    Espina-Hernandez, J.H.; Caleyo, F.; Hallen, J.M. [Instituto Politecnico Nacional (IPN), Zacatenco (Mexico)

    2009-07-01

    The influence of remanent magnetization on pitting corrosion in line-pipe steels is studied. Pitting corrosion experiments have been carried out on samples of an API 5L grade 52 steel under a magnetization level of the same order of magnitude of the remanent magnetization in the pipeline wall after in-line inspection based on magnetic flux leakage. The samples were magnetized using rings of the same grade as the investigated steel. Immediately after magnetization, the investigated samples were subjected to pitting by immersing them in a solution containing dissolved Cl{sup -} and SO{sup 2-}{sub 4} and ions. The pitting experiments were conducted during a seven days period. The pit depth distribution and the maximum pit depth in each sample were recorded and used to conduct extreme value analyses of the pitting process in magnetized and non-magnetized control samples. The statistical assessment of the pitting corrosion data collected during this study shows that the magnetic field reduces the average depth of the pit population and also the extreme pit depth values that can be predicted from the maximum values observed in the magnetized samples in comparison with to the non-magnetized control samples. Scanning electron microscopy observations show that the magnetic field alters the pit morphology by increasing the pit mouth opening. (author)

  7. 77 FR 10773 - Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines; Scheduling of...

    Science.gov (United States)

    2012-02-23

    ... to its notice of institution (76 FR 67473, November 1, 2011) of the subject five-year reviews was.... See 76 FR 61937 (Oct. 6, 2011) and the newly revised Commission's Handbook on E-Filing, available on... COMMISSION Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines; Scheduling...

  8. 77 FR 18266 - Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines; Revised...

    Science.gov (United States)

    2012-03-27

    ... the conduct of the expedited subject five- year reviews (77 FR 10773, February 23, 2012). The... From the Federal Register Online via the Government Publishing Office INTERNATIONAL TRADE COMMISSION Stainless Steel Butt-Weld Pipe Fittings From Italy, Malaysia, and the Philippines;...

  9. 75 FR 16071 - Circular Welded Carbon Quality Steel Line Pipe from the People's Republic of China: Notice of...

    Science.gov (United States)

    2010-03-31

    ....) invoice price on all shipments of subject merchandise from the Huludao Companies entered or withdrawn from... 36.53 percent of the f.o.b. invoice price on all shipments of subject merchandise from companies... International Trade Administration Circular Welded Carbon Quality Steel Line Pipe from the People's Republic...

  10. 76 FR 19788 - Carbon Steel Butt-Weld Pipe Fittings From Brazil, China, Japan, Taiwan, and Thailand

    Science.gov (United States)

    2011-04-08

    ... determined on January 4, 2011 that it would conduct expedited reviews (76 FR 5205). The Commission... COMMISSION Carbon Steel Butt-Weld Pipe Fittings From Brazil, China, Japan, Taiwan, and Thailand... fittings from Brazil, China, Japan, Taiwan, and Thailand would be likely to lead to continuation...

  11. 75 FR 60814 - Carbon Steel Butt-Weld Pipe Fittings From Brazil, China, Japan, Taiwan, and Thailand

    Science.gov (United States)

    2010-10-01

    ..., Deputy Agency Ethics Official, at 202-205-3088. Limited disclosure of business proprietary information... including antidumping duties). If you are a trade/business association, provide the information, on an... antidumping duty orders on carbon steel butt-weld pipe fittings from Brazil, China, Japan, Taiwan, and...

  12. 77 FR 73674 - Circular Welded Carbon-Quality Steel Pipe From India, Oman, The United Arab Emirates, and Vietnam

    Science.gov (United States)

    2012-12-11

    ..., 2012 (77 FR 37711). The hearing was held in Washington, DC, on October 17, 2012, and all persons who... countervailing duty determination with respect to circular welded carbon-quality steel pipe from Vietnam (77 FR 64471, October 22, 2012), the Commission terminated investigation No. 701-TA-485 (77 FR 65712,...

  13. 77 FR 37711 - Circular Welded Carbon-Quality Steel Pipe From India, Oman, the United Arab Emirates, and Vietnam...

    Science.gov (United States)

    2012-06-22

    ... detailed scope language, see 77 FR 19635, April 2, 2012. For further information concerning the conduct of... COMMISSION Circular Welded Carbon-Quality Steel Pipe From India, Oman, the United Arab Emirates, and Vietnam...-fair-value imports from India, Oman, the United Arab Emirates, and Vietnam of circular welded...

  14. 75 FR 73033 - Circular Welded Carbon Steel Pipes and Tubes from Thailand: Amended Final Results of Antidumping...

    Science.gov (United States)

    2010-11-29

    ... Accountant to Neal M. Halper, Director, Office of Accounting ``Cost of Production and Constructed Value... percent, the all-others rate established in the less than fair value investigation. See Circular Welded Carbon Steel Pipes and Tubes From Thailand: Final Determination of Sales at Less Than Fair Value, 51 FR...

  15. 75 FR 69050 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From the People's...

    Science.gov (United States)

    2010-11-10

    ...-thickness, manufacturing process (e.g., hot-finished or cold- drawn), end finish (e.g., plain end, beveled... profiles'' suitable for cold finishing operations, such as cold drawing, to meet the American Society for... International Trade Administration Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe...

  16. Singing mitigation in corrugated tubes with liquid injection

    NARCIS (Netherlands)

    Belfroid, S.P.C.; Golliard, J.; Vijlbrief, O.

    2013-01-01

    Pipes with a corrugated inner surface, as used in flexible pipes for gas production and transport, can generate a high amplitude tonal sound (singing). Small quantities of liquid can result in a significant amplitude reduction or total mitigation of this sound production. To evaluate different poten

  17. 钢管管道敞开式顶管纠偏控制%Deviation-Correction Control of Steel Pipe for Open Pipe Jacking

    Institute of Scientific and Technical Information of China (English)

    张肃肃

    2015-01-01

    Analysis and research on deviation‐correction of steel pipe for open pipe jacking ,combined with the different characteristic of surrounding rocks that centralized heating and cooling pipes project passed through in economic zone of CBD General Headquarters in Chongqing ,the litholocal included soil mass(earth backing) and bedrock(sandstone ,shale) ,carried on deviation‐correction control in pipe jacking launching. After the project finished ,the deviation of pipe was in the permissible range.%对钢管管道敞开式顶管纠偏进行了分析研究,结合重庆CBD总部经济区集中供冷供热管道工程施工中的土体(回填土体)、岩石(砂岩、页岩)的不同围岩特性,在顶管顶进过程中进行纠偏控制。工程完工后,管道偏差在允许范围内。

  18. Electron Cloud in Steel Beam Pipe vs Titanium Nitride Coated and Amorphous Carbon Coated Beam Pipes in Fermilab's Main Injector

    Energy Technology Data Exchange (ETDEWEB)

    Backfish, Michael

    2013-04-01

    This paper documents the use of four retarding field analyzers (RFAs) to measure electron cloud signals created in Fermilab’s Main Injector during 120 GeV operations. The first data set was taken from September 11, 2009 to July 4, 2010. This data set is used to compare two different types of beam pipe that were installed in the accelerator. Two RFAs were installed in a normal steel beam pipe like the rest of the Main Injector while another two were installed in a one meter section of beam pipe that was coated on the inside with titanium nitride (TiN). A second data run started on August 23, 2010 and ended on January 10, 2011 when Main Injector beam intensities were reduced thus eliminating the electron cloud. This second run uses the same RFA setup but the TiN coated beam pipe was replaced by a one meter section coated with amorphous carbon (aC). This section of beam pipe was provided by CERN in an effort to better understand how an aC coating will perform over time in an accelerator. The research consists of three basic parts: (a) continuously monitoring the conditioning of the three different types of beam pipe over both time and absorbed electrons (b) measurement of the characteristics of the surrounding magnetic fields in the Main Injector in order to better relate actual data observed in the Main Injector with that of simulations (c) measurement of the energy spectrum of the electron cloud signals using retarding field analyzers in all three types of beam pipe.

  19. Guided Wave Sensing In a Carbon Steel Pipe Using a Laser Vibrometer System

    Science.gov (United States)

    Ruíz Toledo, Abelardo; Salazar Soler, Jordi; Chávez Domínguez, Juan Antonio; García Hernández, Miguel Jesús; Turó Peroy, Antoni

    2010-05-01

    Non-Destructive Evaluation (NDE) techniques have achieved a great development during the last decades as a valuable tool for material characterization, manufacturing control and structural integrity tests. Among these tools, the guided wave technology has been rapidly extended because it reduces inspection time and costs compared to the ordinary point by point testing in large structures, as well as because of the possibility of inspecting under insulation and coating conditions. This fast development has motivated the creation of several inspection and material characterization systems including different technologies which can be combined with this technique. Different measurements systems based on laser techniques have been presented in order to inspect pipes, plates and diverse structures. Many of them are experimental systems of high cost and complexity which combine the employment of a laser for generation of waves in the structure and an interferometer for detection. Some of them employ air-coupled ultrasound generation transducers, with high losses in air and which demand high energy for exciting waves in materials of high stiffness. The combined employment of a commercial vibrometer system for Lamb wave sensing in plates has been successfully shown in the literature. In this paper we present a measurement system based on the combined employment of a piezoelectric wedge transducer and a laser vibrometer to sense guided acoustic waves in carbon steel pipes. The measurement system here presented is mainly compounded of an angular wedge transducer, employed to generate the guided wave and a commercial laser vibrometer used in the detection process. The wedge transducer is excited by means of a signal function generator whose output signal has been amplified with a power signal amplifier. A high precision positioning system is employed to place the laser beam at different points through the pipe surface. The signal detected by the laser vibrometer system is

  20. Assessment of Crack Detection in Heavy-Walled Cast Stainless Steel Piping Welds Using Advanced Low-Frequency Ultrasonic Methods

    Energy Technology Data Exchange (ETDEWEB)

    Anderson, Michael T.; Crawford, Susan L.; Cumblidge, Stephen E.; Denslow, Kayte M.; Diaz, Aaron A.; Doctor, Steven R.

    2007-03-01

    Studies conducted at the Pacific Northwest National Laboratory in Richland, Washington, have focused on assessing the effectiveness and reliability of novel approaches to nondestructive examination (NDE) for inspecting coarse-grained, cast stainless steel reactor components. The primary objective of this work is to provide information to the U.S. Nuclear Regulatory Commission on the effectiveness and reliability of advanced NDE methods as related to the inservice inspection of safety-related components in pressurized water reactors (PWRs). This report provides progress, recent developments, and results from an assessment of low frequency ultrasonic testing (UT) for detection of inside surface-breaking cracks in cast stainless steel reactor piping weldments as applied from the outside surface of the components. Vintage centrifugally cast stainless steel piping segments were examined to assess the capability of low-frequency UT to adequately penetrate challenging microstructures and determine acoustic propagation limitations or conditions that may interfere with reliable flaw detection. In addition, welded specimens containing mechanical and thermal fatigue cracks were examined. The specimens were fabricated using vintage centrifugally cast and statically cast stainless steel materials, which are typical of configurations installed in PWR primary coolant circuits. Ultrasonic studies on the vintage centrifugally cast stainless steel piping segments were conducted with a 400-kHz synthetic aperture focusing technique and phased array technology applied at 500 kHz, 750 kHz, and 1.0 MHz. Flaw detection and characterization on the welded specimens was performed with the phased array method operating at the frequencies stated above. This report documents the methodologies used and provides results from laboratory studies to assess baseline material noise, crack detection, and length-sizing capability for low-frequency UT in cast stainless steel piping.

  1. Analysis of noncoplanar pressurized laminations in X2 steel pipes by non-linear finite element

    Energy Technology Data Exchange (ETDEWEB)

    Morales, Alfredo [Instituto Tecnologico de Puebla (Mexico). Dept. de Posgrado; Gonzalez, Jorge L.; Hallen, Jose M. [Instituto Politecnico Nacional (Mexico). Escuela Superior de Ingenieria Quimica e Industrias Extractivas (ESIQIE). Dept. de Ingenieria Metalurgica

    2005-07-01

    Hydrogen induced cracking is of great interest in the mechanical integrity assessment of sour gas pipelines. Multiple stepwise cracks with internal pressure called laminations are often observed in pipelines and their interaction and coalescence may significantly affect the residual strength of the pipes. In this work, the interacting fields of non coplanar pressurized laminations in the wall of a pipe under pressure are analyzed by non-lineal finite element, considering an isotropic hardening law and the real tensile properties of the X52 steel. The results are presented as the evolution of the stress fields in the interlaminar region as a function of the pressure inside the laminations. It is found that for two approaching stepwise laminations the critical pressure follows a hyperbolic type law, thus the effect of the lamination length is principal for greater lengths and for shorter lengths the effect is minimum. The critical pressure is defined as pressure inside the lamination that causes plastification of the interlaminar region. (author)

  2. A fatigue initiation parameter for gas pipe steel submitted to hydrogen absorption

    Energy Technology Data Exchange (ETDEWEB)

    Capelle, J.; Gilgert, J.; Pluvinage, G. [LaBPS - Ecole Nationale d' Ingenieurs de Metz et Universite Paul Verlaine Metz, Ile du Saulcy, 57045 Metz (France)

    2010-01-15

    Fatigue initiation resistance has been determined on API 5L X52 gas pipe steel. Tests have been performed on Roman Tile (RT) specimen and fatigue initiation was detected by acoustic emission. A comparison between specimens electrolytically charged with hydrogen and specimens without hydrogen absorption were made and it has been noted that fatigue initiation time is reduced of about 3 times when hydrogen embrittlement occurs. It has been proposed to use the concept of Notch Stress Intensity Factor as parameter to describe the fatigue initiation process. Due to the fact that hydrogen is localised in area with high hydrostatic pressure, definitions of local effective stress and distance have been modified when hydrogen is absorbed. This modification can be explained by existence of a ductile-brittle transition with hydrogen concentration. The fatigue initiation resistance curve allows that to determine a threshold for large number of cycles of fatigue non initiation. This parameter introduced in a Failure Assessment Diagram (FAD) provides supplementary information about defect nocivity in gas pipes: a non-critical defect can be detected as dormant or not dormant defect i.e., as non propagating defect. (author)

  3. 薄壁波纹钢管混凝土柱滞回性能试验研究%Experimental study on the hysteretic behaviors of thin-walled corrugated concrete-filled steel tube column

    Institute of Scientific and Technical Information of China (English)

    高剑平; 吴永根; 霍静思

    2012-01-01

    近年来,薄壁钢管混凝土柱由于其良好的力学性能和施工性能在各类建筑结构和桥梁上得到了广泛应用,但震害表明,普通薄壁钢管混凝土柱抗局部屈曲能力和屈曲后抗震性能较差.提出了一种薄壁波纹钢管混凝土柱,为了初步探索其抗震性能,以轴压比和截面形式为主要参数,进行了2根薄壁波纹钢管混凝土柱和2根普通薄壁钢管混凝土柱低周反复加载试验研究.主要结论如下:在轴压比相同的情况下,薄壁波纹钢管混凝土柱的滞回曲线明显要比其它两种截面形式的饱满;在相同位移时,薄壁波纹钢管混凝土柱的耗能能力明显好于方形和圆形的.三种截面形式的延性较接近且延性系数均超过3,且强度退化和刚度退化趋势和程度基本一致.综合分析,薄壁波纹钢管混凝土柱抗震性能较之圆、方形薄壁钢管混凝土柱的相当或稍好.研究结果可供城市高架桥的分析与设计参考.%In recent years, thin-walled concrete-filled steel tube column ha been widely used in many types of building structures and bridges, owing to its good mechanical properties and construction performance. However, the local buckling capacity and post-buckling seismic capacity of common thin-walled concrete-filled steel tube column are poor. A new-style thin-walled corrugated concrete-filled steel tube column was proposed. A low cyclic loading test was conducted to study its seismic performance with axial-compression ratio and section form as the main parameters. The main conclusions are as follows; the hysteresis loops of thin-walled corrugated steel concrete column are fuller than those of the other two section forms under the same axial-compression ratio. The dissipation energy capacity of thin-walled corrugated steel concrete column is better than that of square and circle under the same displacement condition. The ductility coefficients of the three section forms are close and all

  4. Corrosion resistance of ERW (Electric Resistance Welded) seam welds as compared to metal base in API 5L steel pipes

    Energy Technology Data Exchange (ETDEWEB)

    Gonzalez Velasquez, Jorge L.; Godinez Salcedo, Jesus G.; Lopez Fajardo, Pedro [Instituto Politecnico Nacional (IPN), Mexico D.F. (Mexico). Escuela Superior de Ingenieria Quimica e Industrias Extractivas (ESIQIE). Dept. de Ingenieria Metalurgica

    2009-07-01

    The corrosion resistance of ERW seam welds and the base metal in API 5L X70 steel pipes was evaluated by Tafel tests. The procedure was according to ASTM G3 standard. The study was completed with metallographic and chemical characterization of the tested zones, that is, the welded zone and the base metal away of the weld. All tests were made on the internal surface of the pipe in order to assess the internal corrosion of an in-service pipeline made of the API 5L X70 steel. The test solution was acid brine prepared according to NACE Publications 1D182 and 1D196. The results showed that the ERW seam weld corrodes as much as three times faster than the base material. This behavior is attributed to a more heterogeneous microstructure with higher internal energy in the ERW seam weld zone, as compared to the base metal, which is basically a ferrite pearlite microstructure in a normalized condition. This result also indicates that pipeline segments made of ERW steel pipe where the seam weld is located near or at the bottom of the pipe are prone to a highly localized attack that may form channels of metal loss if there is water accumulation at the bottom of the pipeline. (author)

  5. An experience with in-service fabrication and inspection of austenitic stainless steel piping in high temperature sodium system

    Energy Technology Data Exchange (ETDEWEB)

    Ravi, S., E-mail: sravi@igcar.gov.in; Laha, K.; Sakthy, S.; Mathew, M.D.; Bhaduri, A.K.

    2015-04-01

    Highlights: • Procedure for changing 304L SS pipe to 316L SS in sodium loop has been established. • Hot leg made of 304L SS was isolated from existing cold leg made of 316LN SS. • Innovative welding was used in joining the new 316L SS pipe with existing 316LN SS. • The old components of 304L SS piping have been integrated with the new piping. - Abstract: A creep testing facility along with dynamic sodium loop was installed at Indira Gandhi Centre for Atomic Research, Kalpakkam, India to assess the creep behavior of fast reactor structural materials in flowing sodium. Type 304L austenitic stainless steel was used in the low cross section piping of hot-leg whereas 316LN austenitic stainless steel in the high cross section cold-leg of the sodium loop. The intended service life of the sodium loop was 10 years. The loop has performed successfully in the stipulated time period. To enhance its life time, it has been decided to replace the 304L piping with 316L piping in the hot-leg. There were more than 300 welding joints involved in the integration of cold-leg with the new 316L hot-leg. Continuous argon gas flow was maintained in the loop during welding to avoid contamination of sodium residue with air. Several innovative welding procedures have been adopted for joining the new hot-leg with the existing cold-leg in the presence of sodium residue adopting TIG welding technique. The joints were inspected for 100% X-ray radiography and qualified by performing tensile tests. The components used in the discarded hot-leg were retrieved, cleaned and integrated in the renovated loop. A method of cleaning component of sodium residue has been established. This paper highlights the in-service fabrication and inspection of the renovation.

  6. Drop Weight Impact Behavior of Al-Si-Cu Alloy Foam-Filled Thin-Walled Steel Pipe Fabricated by Friction Stir Back Extrusion

    Science.gov (United States)

    Hangai, Yoshihiko; Nakano, Yukiko; Utsunomiya, Takao; Kuwazuru, Osamu; Yoshikawa, Nobuhiro

    2017-02-01

    In this study, Al-Si-Cu alloy ADC12 foam-filled thin-walled stainless steel pipes, which exhibit metal bonding between the ADC12 foam and steel pipe, were fabricated by friction stir back extrusion. Drop weight impact tests were conducted to investigate the deformation behavior and mechanical properties of the foam-filled pipes during dynamic compression tests, which were compared with the results of static compression tests. From x-ray computed tomography observation, it was confirmed that the fabricated foam-filled pipes had almost uniform porosity and pore size distributions. It was found that no scattering of the fragments of collapsed ADC12 foam occurred for the foam-filled pipes owing to the existence of the pipe surrounding the ADC12 foam. Preventing the scattering of the ADC12 foam decreases the drop in stress during dynamic compression tests and therefore improves the energy absorption properties of the foam.

  7. Seismic fragility analysis of buried steel piping at P, L, and K reactors

    Energy Technology Data Exchange (ETDEWEB)

    Wingo, H.E.

    1989-10-01

    Analysis of seismic strength of buried cooling water piping in reactor areas is necessary to evaluate the risk of reactor operation because seismic events could damage these buried pipes and cause loss of coolant accidents. This report documents analysis of the ability of this piping to withstand the combined effects of the propagation of seismic waves, the possibility that the piping may not behave in a completely ductile fashion, and the distortions caused by relative displacements of structures connected to the piping.

  8. Investigation on short-term burst pressure of plastic pipes reinforced by cross helically wound steel wires

    Institute of Scientific and Technical Information of China (English)

    Jin-yang ZHENG; Yong-jian GAO; Xiang LI; Xiu-feng LIN; Yu-bin LU; Yan-cong ZHU

    2008-01-01

    Plastic pipes reinforced by cross helically wound steel wires (PSP), which have exhibited excellent mechanical performance, consist of inner polyethylene (PE) layer, winding layer and outer PE layer. The winding layer is composed of two monolayers where steel wires are cross helically wound. An analytical procedure is developed to predict the short-term burst pressure of PSP as the monolayer is assumed to be elastic and orthotropic. The 3D anisotropic elasticity and Maximum Stress Failure Criterion are employed in the formulation of the elasticity problem. Good agreement between the theoretical results and the experimental data shows that the proposed approach can well predict the short-term burst pressure of PSP.

  9. Structural Design of Multi-Pylon Cable-Stayed Bridge with Corrugated Steel Webs for Chaoyang Bridge in Nanchang%南昌朝阳大桥波形钢腹板多塔斜拉桥结构设计

    Institute of Scientific and Technical Information of China (English)

    陈水生; 钟志斌; 桂水荣; 刘旭政; 钟汉清

    2014-01-01

    The PC composite box girder with corrugated steel webs is applicable to bridges with a variety of structural types ,which exhibits superior durability and economic features as com‐pared with the common concrete box girder .The cable‐stayed bridge with corrugated steel webs is regarded as the type of structure where composite box girder with corrugated steel webs is ingen‐iously used ,making better use of the properties of the two structures . The main navigational bridge of the Chaoyang Bridge in Nanchang is a (79+ 5 × 150+79) m continuous composite box girder cable‐stayed bridge with corrugated steel webs .The bridge has six pylons and the stay ca‐bles are arranged in single cable plane .In addition ,the bridge has two layers of decks ,on the up‐per deck ,dual eight vehicle lanes (four lanes each side) are arranged and pedestrian and non‐mo‐torized vehicle lanes are arranged on the lower deck .Based on the analysis and study undertaken , small side span‐to‐main span ratio was chosen .Due to the multiple pylons ,the load path from the intermediate pylons to the side pylons is long and the effect of ancillary piers in the side spans is minimal ,as a result ,no ancillary piers are installed .In the structural system ,the pylons and the main girder are fixed while the girder and piers are separated .The box girder is 43 .84 m wide , with transverse steel diaphragms .The stay cables are fanned out in single cable plane .The pylon looks like the Chinese character“合“ ,and double bearings are installed at the pylons .T he stay vi‐bration mitigation bearings are used as the vibration mitigation and isolation devices of the super‐structure ,which are installed below the two side pylons .%波形钢腹板PC组合箱梁适用于不同结构形式的桥梁,相比普通混凝土箱梁具有显著的耐久性和经济性,波形钢腹板斜拉桥将波形钢腹板组合箱梁应用到斜拉桥中,充分发挥了2种结构的特点。南昌朝

  10. Study of Lining Concrete Arrangement for Multi-Cell Single Box Composite Girder with Corrugated Steel Webs%单箱多室波形钢腹板组合箱梁内衬混凝土布置方式研究

    Institute of Scientific and Technical Information of China (English)

    邓文琴; 张建东; 刘朵; 胡隽

    2016-01-01

    为优化波形钢腹板内衬混凝土组合结构受力,以南昌朝阳大桥通航孔桥———单箱多室波形钢腹板单索面多塔斜拉桥为工程背景,通过理论计算和有限元分析研究了单箱多室波形钢腹板组合箱梁内衬混凝土布置形式对结构抗剪性能的影响。结果表明:有无设置内衬混凝土对单箱多室波形钢腹板组合箱梁腹板剪应力水平较高的波形钢腹板影响较大,对腹板剪应力水平较低的波形钢腹板影响较小;内衬混凝土单侧设置和双侧设置波形钢腹板剪应力的影响相差不大;内衬混凝土双侧设置及仅有内衬混凝土无波形钢腹板设置对混凝土剪应力的影响相差较小;对单箱多室波形钢腹板组合箱梁高剪应力水平腹板内衬混凝土可以考虑双侧布置或仅设置混凝土腹板,不设置波形钢腹板;而剪应力水平较低的腹板则考虑设置单侧内衬混凝土。%To optimize the load bearing capacity of the corrugated steel web and lining concrete composite structure ,the navigational channel bridge of Nanchang Chaoyang Bridge was taken as the study background .The bridge is a multi‐pylon multi‐cell single box girder cable‐stayed bridge with corrugated steel webs and the stay cables are fanned out in single cable plane .The influence of the arrangement of lining concrete in the multi‐cell single box composite girder with corrugated steel webs on the anti‐shearing performance of the structure was studied via theoretical calculation and finite element analysis .The results indicate that the addition of lining concrete has significant influence on the corrugated steel webs with higher shearing stress in the multi‐cell single box gird‐er with corrugated steel webs ,but slight influence on the corrugated steel webs with lower stress level .No matter the lining concrete is added to a single side of the webs or to both the two sides of the webs ,the influence exerted

  11. Optimized Design of the Mould for Steel Pipe Reshaping & Straightening Machine%钢管整径矫直机模具的优化设计

    Institute of Scientific and Technical Information of China (English)

    姚华; 李翠艳; 边城; 王庆雷

    2015-01-01

    In this article, it explored the current status and existing problems of reshaping& straightening technology for steel pipe. Combined with reshaping&straightening technology and equipment characteristics, the optimized design was carried out on the mould of steel pipe reshaping & straightening machine, it realized the objective of reshaping & straightening for the steel pipe which pipe diameter is not more than φ762 mm. For the steel pipe with diameter more than φ762 mm, during straightening process, the pipe wall is easily flattened, so the reshaping & straightening technology for straightness exceeding standard will be continuously researched.%探讨了当前钢管整径矫直技术的现状和存在的问题,并对钢管整径矫直工艺进行了介绍,结合钢管整径矫直工艺和设备特点对钢管整径矫直机模具进行了优化设计。研究结果表明,对于管径不大于762 mm的钢管,整径矫直效果良好,满足标准要求;对于管径大于762 mm的钢管,矫直过程中容易出现管壁压扁的问题,该问题还将继续进行深入研究。

  12. Finite Element Analysis of Modeling Residual Stress Distribution in All-position Duplex Stainless Steel Welded Pipe

    Institute of Scientific and Technical Information of China (English)

    Xiaojun JIN; Lixing HUO; Yufeng ZHANG; Bingren BAI; Xiaowei LI; Jun CAO

    2004-01-01

    On the basis of the thermal-elastic-plastic theory, a three-dimensional finite element numerical simulation is performed on the girth welded residual stresses of the duplex stainless steel pipe with ANSYS nonlinear finite element program for the first time. Three-dimensional FEM using mobile heat source for analysis transient temperature field and welding stress field in circumferential joint of pipes is founded. Distributions of axial and hoop residual stresses of the joint are investigated. The axial and the hoop residual stresses at the weld and weld vicinity on inner surface of pipes are tensile, and they are gradually transferred into compressive with the increase of the departure from the weld. The axial residual stresses at the weld and weld vicinity on outer surface of pipes is compressive while the hoop one is tensile. The distributions of residual stresses compared positive-circle with negative-circle show distinct symmetry. These results provide theoretical knowledge for the optimization of process and the control of welding residual stresses.

  13. Development of Wall Thinning Distinction Method using the Multi-inspecting UT Data of Carbon Steel Piping

    Energy Technology Data Exchange (ETDEWEB)

    Hwang, Kyeong Mo; Yun, Hun; Lee, Chan Kyoo [KEPCO E and C, Yongin (Korea, Republic of)

    2012-05-15

    To manage the wall thinning of carbon steel piping in nuclear power plants, the utility of Korea has performed thickness inspection for some quantity of pipe components during refueling outages and determined whether repair or replacement after evaluating UT (Ultrasonic Test) data. When the existing UT data evaluation methods, such as Band, Blanket, PTP (Point to Point) Methods, are applied to a certain pipe component, unnecessary re-inspecting situations may be generated even though the component does not thinned. In those cases, economical loss caused by repeated inspection and problems of maintaining the pipe integrity followed by decreasing of newly inspected components may be generated. EPRI (Electric Power Research Institute) in USA has suggested several statistical methods, TPM (Total Point Method), LSS (Least Square Slope) Method, etc. to distinguish whether multiple inspecting components have thinned or not. This paper presents the analysis results for multiple inspecting components over three times based on both NAM (Near Area of Minimum) Method developed by KEPCO-E and C and the other methods suggested by EPRI.

  14. Effect of vanadium on the precipitation strengthening upon tempering of a high-strength pipe steel with different initial structure

    Science.gov (United States)

    Sych, O. V.; Kruglova, A. A.; Schastlivtsev, V. M.; Tabatchikova, T. I.; Yakovleva, I. L.

    2016-12-01

    Methods of metallography, scanning electron, and transmission electron microscopies were used to study the structure of two pipe steels (without vanadium and with 0.03% vanadium) subjected to γ → α isothermal transformation at temperatures of 400-600°C (initial structure) and tempering at 600-650°C. It has been found that the addition of 0.03% vanadium intensifies the process of the precipitation of ferrite and contributes to the formation of a granular structure. It has been shown that, in high-strength pipe steels with 0.03% vanadium, which have bainitic granular-type structures, the effect of the precipitation strengthening is effected upon subsequent high-temperature tempering at 600-630°; the addition of vanadium leads to an increase in the hardness by 16 HV. In the presence of bainite of the lath type in the initial structure, the subsequent tempering leads to a softening associated with the processes of the recovery, polygonization, and initial stages of recrystallization in situ, which develops at temperatures above 640°C. It has been found that the hardness of the steel without vanadium upon additional tempering decreases regardless of the morphology of structural constituents in the initial structure.

  15. Comprehensive Application of Steel Reinforced Concrete Jacking Pipe and Sand Glass Fiber Reinforced Plastic Pipe%钢筋混凝土管顶管与夹砂玻璃钢管的综合应用

    Institute of Scientific and Technical Information of China (English)

    李之国

    2009-01-01

    该文介绍了采用DN2200钢筋混凝土管作为穿越管道进行顶管施工,然后在钢筋混凝土管内安装DNl800承插式夹砂玻璃钢管相结合的施工方法.此施工方法可有效地解决埋深较大的市政污水压力管道工程的施工技术问题.现供从事市政污水压力管道工程施工的同行参考.%The article introduces the construction of jacking pipe by using DN2200 steel reinforced concrete pipe as the crossing pipe, and the construction method of then installing DN1800 socket-and-spigot sand glass fiber reinforced plastic pipe into the steel reinforced concrete pipe. This construction method can efficiently solve the construction technical problems of the deeper embedded municipal sewage pressure pipe, which can provide the reference for the construction of the municipal sewage pressure pipe.

  16. Experimental performance of a waste heat recovery and utilization system with a looped water-in-steel heat pipe

    Energy Technology Data Exchange (ETDEWEB)

    Habeebullah, M.H.; Akyurt, M.; Najjar, Y.S.H.; El-Kalay, A.K. [King Abdulaziz Univ., Jeddah (Saudi Arabia). College of Engineering

    1998-07-01

    An experimental facility is described for the recovery, by means of heat-pipes, of waste-heat from exhaust gases, and the utilization of the recovered energy to cool ambient air. To this end, heat of combustion gases, generated in a stainless-steel combustion chamber, is recovered from the stack by means of a heat-pipe system. The recovered heat is utilized to run a modified commercial aqua-ammonia absorption chiller. Chilled water from the chiller is supplied to a fan-coil type cooling tunnel to cool the intake air of a (conceptual) gas turbine engine to boost its performance. It is concluded from test results that the experimental facility performs well, and that it behaves as predicted by modeling and simulation studies. The system is able to extract between 70 and 93% of the technically recoverable energy from exhaust gases, and utilizes the extracted energy to cool air. (Author)

  17. Study of Mechanical Properties and Characterization of Pipe Steel welded by Hybrid (Friction Stir Weld + Root Arc Weld) Approach

    Energy Technology Data Exchange (ETDEWEB)

    Lim, Yong Chae [ORNL; Sanderson, Samuel [MegaStir Technologies LLC; Mahoney, Murray [Consultant; Wasson, Andrew J [ExxonMobil, Upstream Research Company (URC); Fairchild, Doug P [ExxonMobil, Upstream Research Company (URC); Wang, Yanli [ORNL; Feng, Zhili [ORNL

    2015-01-01

    Friction stir welding (FSW) has recently attracted attention as an alternative construction process for gas/oil transportation applications due to advantages compared to fusion welding techniques. A significant advantage is the ability of FSW to weld the entire or nearly the entire wall thickness in a single pass, while fusion welding requires multiple passes. However, when FSW is applied to a pipe or tube geometry, an internal back support anvil is required to resist the plunging forces exerted during FSW. Unfortunately, it may not be convenient or economical to use internal backing support due to limited access for some applications. To overcome this issue, ExxonMobil recently developed a new concept, combining root arc welding and FSW. That is, a root arc weld is made prior to FSW that supports the normal loads associated with FSW. In the present work, mechanical properties of a FSW + root arc welded pipe steel are reported including microstructure and microhardness.

  18. Sodium Based Heat Pipe Modules for Space Reactor Concepts: Stainless Steel SAFE-100 Core

    Science.gov (United States)

    Martin, James J.; Reid, Robert S.

    2004-01-01

    A heat pipe cooled reactor is one of several candidate reactor cores being considered for advanced space power and propulsion systems to support future space exploration applications. Long life heat pipe modules, with designs verified through a combination of theoretical analysis and experimental lifetime evaluations, would be necessary to establish the viability of any of these candidates, including the heat pipe reactor option. A hardware-based program was initiated to establish the infrastructure necessary to build heat pipe modules. This effort, initiated by Los Alamos National Laboratory and referred to as the Safe Affordable Fission Engine (SAFE) project, set out to fabricate and perform non-nuclear testing on a modular heat pipe reactor prototype that can provide 100 kilowatt from the core to an energy conversion system at 700 C. Prototypic heat pipe hardware was designed, fabricated, filled, closed-out and acceptance tested.

  19. 爬行式钢管外表面打磨器%Outer Surface Grinders of Crawl Type Steel Pipe

    Institute of Scientific and Technical Information of China (English)

    何小琳; 熊健祥; 胡庆乐; 李克天

    2015-01-01

    Design and development of a crawling tube-polished outer surface descaling. Main building of c-shaped structure, easy handling in the pipe. Three angles of grinding head is installed, run back and forth than a 120-degree angle, 360 degree synthesized steel pipe outer surface grinding operations. Through two sets of alternating electromagnets clamping device for clamping,with the screw drive and kickback operation realized Sanders on the steel pipe creep feed. The device can be applied to the outer surface of metal pipe dangling erection and protective railings rust sanding of metal tubes.%设计开发了一种爬行式钢管外表面除锈打磨器。主体结构采用C字形结构,容易在钢管上装卸。三个等角度安装的打磨头,各往复运行大于120°,合成360°的钢管外表面的打磨作业。通过两套电磁铁夹持装置的交替夹持,配合螺杆正程和反程运转,实现打磨器在钢管上的爬行进给。该装置可应用于悬空架设的金属管道外表面和金属管防护栏杆的除锈打磨工作。

  20. Aeroacoustics of the swinging corrugated tube: Voice of the Dragon

    NARCIS (Netherlands)

    Nakiboglu, G.; Rudenko, O.; Hirschberg, Abraham

    2012-01-01

    When one swings a short corrugated pipe segment around one’s head, it produces a musically interesting whistling sound. As a musical toy it is called a “Hummer” and as a musical instrument, the “Voice of the Dragon.” The fluid dynamics aspects of the instrument are addressed, corresponding to the

  1. FLOW PATTERN AND PRESSURE LOSS OF OIL-WATER TWO-PHASE FLOW IN HORIZONTAL STEEL PIPE

    Institute of Scientific and Technical Information of China (English)

    CHEN Jie; YAN Da-fan; ZHAO Jing-mei; AN Wei-jie; YAN Da-chun

    2005-01-01

    Experimental Study on oil-water two-phase flow patterns and pressure loss was conducted on a horizontal steel pipe loop with 26.1mm inner diameter and 30m total length.The working fluids are white oil, diesel oil and tap water.Several instruments, including a new type of liquid-probe are successfully integrated to identify 7 different flow patterns.The characteristics of the flow patterns and the transition process were observed and depicted in this paper.Investigation revealed that the pressure loss was mainly depended on the flow patterns.

  2. Effect of Thermal Shock During Legionella Bacteria Removal on the Corrosion Properties of Zinc-Coated Steel Pipes

    Science.gov (United States)

    Orlikowski, Juliusz; Ryl, Jacek; Jazdzewska, Agata; Krakowiak, Stefan

    2016-07-01

    The purpose of this investigation was to conduct the failure analysis of a water-supply system made from zinc-coated steel. The observed corrosion process had an intense and complex character. The brownish deposits and perforations were present after 2-3 years of exploitation. The electrochemical study based on the Tafel polarization, corrosion potential monitoring, and electrochemical impedance spectroscopy together with microscopic analysis via SEM and EDX were performed in order to identify the cause of such intense corrosion. The performed measurements allowed us to determine that thermal shock was the source of polarity-reversal phenomenon. This process had begun the corrosion of steel which later led to the formation of deposits and perforations in the pipes. The work includes appropriate action in order to efficiently identify the described corrosion threat.

  3. 热管余热锅炉在钢管退火炉余热回收中的应用%Application of Heat Pipe Waste Heat Boiler to Recovery of Waste Heat of Steel Pipe Annealing Furnace

    Institute of Scientific and Technical Information of China (English)

    李永; 宿新天; 张子禹; 刘亮; 郭少春

    2013-01-01

    钢管退火炉排出的烟气带有可观的热量,如不加以回收利用,将造成能源的浪费。如果以钢管退火炉的烟气余热在热管余热锅炉中产生蒸汽加以利用,可使钢管退火炉的热效率提高到70%以上。热管余热锅炉是一种值得推广应用的节能装置。%The fuel gas of steel pipe annealing furnace bears a considerable heat , which, if not recovered and utilized , will cause waste energy .If the steam is produced by using the waste heat of flue gas of steel pipe annealing furnace in a heat pipe waste heat boiler and is utilized , the heat efficiency of steel pipe annealing furnace can be increased to 70%and above .The heat pipe waste heat boiler is an energy saving device worth extensive applying .

  4. 49 CFR Appendix B to Part 192 - Qualification of Pipe

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false Qualification of Pipe B Appendix B to Part 192... Pipe I. Listed Pipe Specifications API 5L—Steel pipe, “API Specification for Line Pipe” (incorporated by reference, see § 192.7). ASTM A53/A53M—Steel pipe, “Standard Specification for Pipe, Steel Black...

  5. Technical Letter Report Assessment of Ultrasonic Phased Array Testing for Cast Austenitic Stainless Steel Pressurizer Surge Line Piping Welds and Thick Section Primary System Cast Piping Welds JCN N6398, Task 2A

    Energy Technology Data Exchange (ETDEWEB)

    Diaz, Aaron A.; Denslow, Kayte M.; Cinson, Anthony D.; Morra, Marino; Crawford, Susan L.; Prowant, Matthew S.; Cumblidge, Stephen E.; Anderson, Michael T.

    2008-07-21

    Research is being conducted for the NRC at PNNL to assess the effectiveness and reliability of advanced NDE methods for the inspection of LWR components. The scope of this research encompasses primary system pressure boundary materials including cast austenitic stainless steels (CASS), dissimilar metal welds (DMWs), piping with corrosion-resistant cladding, weld overlays, and far-side examinations of austenitic piping welds. A primary objective of this work is to evaluate various NDE methods to assess their ability to detect, localize, and size cracks in coarse-grained steel components. This interim technical letter report (TLR) provides a synopsis of recent investigations at PNNL aimed at evaluating the capabilities of phased-array (PA) ultrasonic testing (UT) methods as applied to the inspection of CASS welds in nuclear reactor piping. A description of progress, recent developments and interim results are provided.

  6. Improvement of in-line process in high frequency welded steel pipe mill using advance tube tracking system

    Energy Technology Data Exchange (ETDEWEB)

    Babakri, Khalid Ali [Saudi Steel Pipe Company, Dammam, (Saudi Arabia)

    2010-07-01

    The Saudi Steel Pipe Company has designed and implemented a new automated tube tracking system. This paper reported, based on practical experience, the improvement of the in-line process control in high frequency induction (HFI) welded steel pipe mill using this new advance in automated the tube tracking system (TTS). The TTS provides helps in quality control inspection stations (in-process inspection, flattening test, offline ultrasonic, final inspection). For example, the QC inspector at the in-process station is able to choose any tube from the running coil and carry out visual and dimensional inspections. The results will be automatically updated in the TTS. This new system is also integrated with the continuous electronic process control (CEPC) system where the welding and annealing parameters are recorded and linked to each produced coil. It is found that the implementation of the advanced TTS has improved in-line process control on the shop floor. The results showed an increase in productivity and a reduction of operation cost.

  7. Effect of Induction Heat Bending Process on the Properties of ASME SA106 Gr. C Carbon Steel Pipes

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Ki Tae; Kim, Young Sik [Andong National University, Andong (Korea, Republic of); Chang, Hyun Young; Oh, Young Jin [KEPCO Engineering and Construction Company, Seongnam (Korea, Republic of); Sung, Gi Ho [R and D Center, Busan (Korea, Republic of)

    2015-04-15

    Recently, the bending process is greatly applied to fabricate the pipe line. Bending process can reduce welding joints and then decrease the number of inspection. Thus, the maintenance cost will be reduced. Induction heat bending process is composed of bending deformation by repeated local heat and cooling. By this thermal process, corrosion properties and microstructure can be affected. This work focused on the effect of induction heating bending process on the properties of ASME SA106 Gr. C low carbon steel pipes. Microstructure analysis, hardness measurements, and immersion corrosion test were performed for base metal and bended area including extrados, intrados, crown up, and down parts. Microstructure was analyzed using an optical microscope and SEM. Hardness was measured using a Rockwell B scale. Induction heat bending process has influenced upon the size and distribution of ferrite and pearlite phases which were transformed into finer structure than those of base metal. Even though the fine microstructure, every bent area showed a little lower hardness than that of base metal. It is considered that softening by the bending process may be arisen. Except of I2, intrados area, the others showed a similar corrosion rate to that of base metal. But even relatively high rate of intrados area was very low and acceptable. Therefore, it is judged that induction heat bending process didn't affect boric acid corrosion behaviour of carbon steel.

  8. A Study of Ceramic-Lined Composite Steel Pipes Prepared by SHS Centrifugal-Thermite Process

    National Research Council Canada - National Science Library

    Yuxin Li; Letao Jiang; Qing Lu; Peikang Bai; Bin Liu; Jianhong Wang

    2016-01-01

    .... The result showed the ceramic lined pipe is composed of the three main layers of various compositions, which were subsequently determined to be Fe layer, the transition layer and the ceramic layer...

  9. Polyoxometalate and Zirconium-Phosphate Conversion Coating for Steel Piping Project

    Data.gov (United States)

    National Aeronautics and Space Administration — In Sub-topic O3-04, NASA has identified a need for control of material degradation to extend the life and reduce the life-cycle costs of piping systems subject to...

  10. Polyoxometalate and Zirconium-Phosphate Conversion Coating for Steel Piping Project

    Data.gov (United States)

    National Aeronautics and Space Administration — In Sub-topic O3.04, NASA has identified a need for control of material degradation to extend the life and reduce the life-cycle costs of piping systems subject to...

  11. Residual stress distributions in a P91 steel-pipe girth weld before and after post weld heat treatment

    Energy Technology Data Exchange (ETDEWEB)

    Paddea, S., E-mail: s.paddea@open.ac.uk [Materials Engineering, Open University, Walton Hall, Milton Keynes MK7 6AA (United Kingdom); Francis, J.A. [School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester M13 9PL (United Kingdom); Paradowska, A.M. [ISIS Facility, Rutherford-Appleton Laboratory, Didcot OX11 0QX, Oxon (United Kingdom); Bouchard, P.J. [Materials Engineering, Open University, Walton Hall, Milton Keynes MK7 6AA (United Kingdom); Shibli, I.A. [European Technology Development Ltd., Leatherhead KT22 7RD, Surrey (United Kingdom)

    2012-02-01

    Highlights: Black-Right-Pointing-Pointer Residual stresses in a pipe girth weld in P91 steel have been measured in both the as-welded and PWHT conditions. Black-Right-Pointing-Pointer The highest tensile residual stresses coincided with the HAZ boundary and the microstructural region that is prone to type IV cracking. Black-Right-Pointing-Pointer Compressive residual stresses were measured in the weld metal, in a location corresponding to the final weld pass. Black-Right-Pointing-Pointer The location of the peak compressive stresses can be explained by the effect of solid-state phase transformation. - Abstract: In this study the residual stresses in a pipe girth weld in a ferritic-martensitic power plant steel were measured by neutron diffraction and compared with the corresponding metallurgical zones in the weld region. It was found that, in both the as-welded and post-weld heat treated condition, the highest tensile stresses resided near the outer boundary of the heat-affected zone (HAZ), and towards the weld root region. Substantial tensile direct and hydrostatic stresses existed across the HAZ, including the fine-grained and intercritically annealed regions, where premature type IV creep failures manifest in 9-12 Cr steel welds. Compressive stresses were found in the weld metal coinciding with the last weld bead to be deposited. Constrained cooling tests on test coupons illustrated that these compressive stresses can be explained in terms of the influence that solid-state phase transformations have on the accumulation of stress in welds.

  12. Improvement activities to soil stabilization near Bolivia-Brazil gas pipeline crossing through an embankment over a corrugated drainage pipe, at Km 247 in Mato Grosso do Sul, Brazil; Melhorias para estabilidade do gasoduto Bolivia-Brasil em cruzamento de aterro sobre tubo de drenagem tipo ARMCO, no km 247 em Mato Grosso do Sul

    Energy Technology Data Exchange (ETDEWEB)

    Jorge, Kemal Vieira [TBG - Transportadora Brasileira Gasoduto Bolivia Brasil S.A., Rio de Janeiro, RJ (Brazil); Costa, Cesar Augusto [TBG - Transportadora Brasileira Gasoduto Bolivia Brasil S.A., Campo Grande, MS (Brazil). Gerencia Regional Centro Oeste (CRGO)

    2005-07-01

    A hundred and seventy kilometers from Campo Grande city, on Mato Grosso do Sul State, the Brasil-Bolivia Gas Pipeline crosses a 8,5 meters high landfill, over a drainage systems made of a 2,8 meters of diameter corrugated pipe. This drainage pipe was installed to allow the drainage of the valley, and the landfill above it was built so the Gas pipeline could cross easier the 80 meters deep and 30 degree vertices valley. This paper illustrates the work tasks and solutions taken to monitor and guarantee the integrity of the drainage and landfill structures, as well as the integrity of the Gas Pipeline. Some of the work tasks illustrated are the investigation of the support conditions of the Gas Pipeline, the analysis of a drainage system under the pipeline, on a rocky soil, the analysis of the stability of the landfill, the construction of a gravity retaining walls and the monitoring of the deformations on the drainage pipe. (author)

  13. A failure estimation method of steel pipe elbows under in-plane cyclic loading

    Energy Technology Data Exchange (ETDEWEB)

    Jeon, Bub Gyu; Kim, Sung Wan; Choi, Hyoung Suk; Park, Dong Uk [Seismic Simulation Tester Center, Pusan National University, Yangsan (Korea, Republic of); Kim, Nam Sik [Dept. of Civil and Environmental Engineering, Pusan National University, Busan (Korea, Republic of)

    2017-02-15

    The relative displacement of a piping system installed between isolated and nonisolated structures in a severe earthquake might be larger when without a seismic isolation system. As a result of the relative displacement, the seismic risks of some components in the building could increase. The possibility of an increase in seismic risks is especially high in the crossover piping system in the buildings. Previous studies found that an elbow which could be ruptured by low-cycle ratcheting fatigue is one of the weakest elements. Fatigue curves for elbows were suggested based on component tests. However, it is hard to find a quantitative evaluation of the ultimate state of piping elbows. Generally, the energy dissipation of a solid structure can be calculated from the relation between displacement and force. Therefore, in this study, the ultimate state of the pipe elbow, normally considered as failure of the pipe elbow, is defined as leakage under in-plane cyclic loading tests, and a failure estimation method is proposed using a damage index based on energy dissipation.

  14. Corrosion of pipe steel in CO2 containing impurities and possible solutions

    NARCIS (Netherlands)

    Zhang, X.; Zevenbergen, J.F.; Spruijt, M.P.N.; Borys, M.

    2013-01-01

    CO2 flue gases acquired from different sources contain a significant amount of impurities and water, which are corrosive to the pipeline steel. To design the pipelines for large scale of CO2 flue gas transport, the corrosion of pipeline steels has to be investigated in the realistic conditions. In t

  15. Corrosion of pipe steel in CO2 containing impurities and possible solutions

    NARCIS (Netherlands)

    Zhang, X.; Zevenbergen, J.F.; Spruijt, M.P.N.; Borys, M.

    2013-01-01

    CO2 flue gases acquired from different sources contain a significant amount of impurities and water, which are corrosive to the pipeline steel. To design the pipelines for large scale of CO2 flue gas transport, the corrosion of pipeline steels has to be investigated in the realistic conditions. In

  16. Finite element analysis of the collapse and post-collapse behavior of steel pipes applications to the oil industry

    CERN Document Server

    Dvorkin, Eduardo N

    2013-01-01

    This book presents a detailed discussion of the models that were developed to simulate the collapse and post-collapse behavior of steel pipes. The finite element method offers to engineers the possibility of developing models to simulate the collapse behavior of casings inside oil wells and the collapse behavior of deepwater pipelines. However, if technological decisions are going to be reached from these model results, with implications for the economic success of industrial operations, for the occupational safety and health and for the environment, the engineering models need to be highly reliable. Using these models engineers can quantify the effect of manufacturing tolerances, wear, corrosion, etc. This book describes in great details the experimental programs that are developed to validate the numerical results.

  17. 49 CFR 192.112 - Additional design requirements for steel pipe using alternative maximum allowable operating...

    Science.gov (United States)

    2010-10-01

    ...) of this section, additional design features, such as mechanical or composite crack arrestors and/or... surface of the plate/coil or pipe to identify imperfections that impair serviceability such as laminations... must be a hardness test, using Vickers (Hv10) hardness test method or equivalent test method, to...

  18. 75 FR 18788 - Circular Welded Carbon Steel Pipes and Tubes from Thailand: Preliminary Results and Rescission...

    Science.gov (United States)

    2010-04-13

    ... Pacific Pipe at the cash deposit rate required at the time of entry. Interested parties are invited to... by section 751(a)(1) of the Act: (1) for Saha Thai, the cash deposit rate will be the rate... listed above, the cash deposit rate will be the company-specific rate established for the most...

  19. 77 FR 20782 - Circular Welded Carbon Steel Pipes and Tubes From Thailand: Preliminary Results of Antidumping...

    Science.gov (United States)

    2012-04-06

    ... Determination of Sales at Less Than Fair Value: Certain Cut-to-Length Carbon Steel Plate from South Africa, 62... increased Saha Thai's reported painting labor costs to reflect the higher of transfer or market prices in...

  20. 77 FR 32539 - Circular Welded Carbon-Quality Steel Pipe From the United Arab Emirates: Preliminary...

    Science.gov (United States)

    2012-06-01

    .... \\14\\ See SeAH Vina comments dated December 5, 2011; see also Certain Circular Welded Non-Alloy Steel..., 1340 (Fed. Cir. 2009). \\36\\ See Narrow Woven Ribbons With Woven Selvedge From the People's Republic...

  1. Effect of corrugated characteristics on the liquid nitrogen temperature field of HTS cable

    Science.gov (United States)

    Li, Z. M.; Li, Y. X.; Zhao, Y. Q.; Gao, C.; Qiu, M.; Chen, G. F.; Gong, M. Q.; Wu, J. F.

    2014-01-01

    In the high temperature superconducting (HTS) cable system, liquid nitrogen is usually chosen to be the coolant because of its low saturation temperature and large latent heat of vaporization. Thus, it is very important for superconducting cables that the liquid nitrogen temperature field keeps stable. However, the cryostat is usually made of flexible corrugated pipes and multi-layer insulation materials. The characteristics (e.g. wave pitch and wave depth) of corrugated pipes may have an effect on the heat exchange between cable and liquid nitrogen, even the whole temperature field of liquid nitrogen. In this paper, a two-dimensional model for 30 m long HTS cable has been modified to analyze the effect of corrugated characteristics on the temperature field of liquid nitrogen. The liquid nitrogen temperature difference between the outlet and the inlet of passage gradually increases as the wave pitch of the corrugated tube decreases and the wave depth increases.

  2. Residual strain measurements of a fatigued metal stick and heat treated steel pipe at JRR3M-RESA

    Energy Technology Data Exchange (ETDEWEB)

    Inoue, Kazuko; Horikawa, Takeshi; Kawashima, Hisaichi [Ryukoku Univ., Kyoto (Japan); Minakawa, Nobuaki; Tsuchiya, Yoshinori

    1997-06-01

    A residual strain on section of notched edge after fatiguing the carbon steel round bar with ring shape and semi-circular section and on thick direction of 13% Cr-steel pipe for oil well heat-treated after machining was tried to test. It was one of the initial experiments in residual strain measurement apparatus (RESA; old name is DIVE) installed at T2-1 port of JRR-3M to test a residual strain at section of 8 mm in diameter of the fatigue specimen at three (x{sup -}, y{sup -} and z{sup -}) directions on a fine mesh of 1 mm step. This test has another aim to inspect the apparatus itself such as obtained accuracy, required testing time, and so on, except original aim to find out strain of the specimen. As a result of the initial experiment, a lot of points to be investigated and improved were found out. According to these results, at present a fatigue specimen with large diameter (40 mm) is now in preparation. And, as is now processing on improvement of a monochromator to increase the beam intensity and so on, a higher resolution as well as a finer (about 1 micron) beam diameter for the specimen is expected to establish. (G.K.)

  3. Selecting the form of plate corrugations of heat exchangers

    Energy Technology Data Exchange (ETDEWEB)

    Pavlenko, V.F.; Nagornyi, V.E.; Dolinskii, V.M.; Kolokolova, T.G.; Chekhov, O.S.

    1987-03-01

    The authors, in the interest of enhancing the thermal efficiency of plate-type heat exchangers, seek to optimize the pattern and size of the corrugations and surface area of these plates as well as their thickness by assessing the corrosion and scale protection afforded by thermoplastic coatings applied to the carbon steels used in the plates. They test the coatings for the effects of pressure, temperature, and various corrosive media, and demonstrate a parametric technique for optimizing pressure and temperature distribution over the corrugated area, for reducing the potential for deformation, and for prolonging plate durability.

  4. Effects of phosphate addition on biofilm bacterial communities and water quality in annular reactors equipped with stainless steel and ductile cast iron pipes.

    Science.gov (United States)

    Jang, Hyun-Jung; Choi, Young-June; Ro, Hee-Myong; Ka, Jong-Ok

    2012-02-01

    The impact of orthophosphate addition on biofilm formation and water quality was studied in corrosion-resistant stainless steel (STS) pipe and corrosion-susceptible ductile cast iron (DCI) pipe using cultivation and culture-independent approaches. Sample coupons of DCI pipe and STS pipe were installed in annular reactors, which were operated for 9 months under hydraulic conditions similar to a domestic plumbing system. Addition of 5 mg/L of phosphate to the plumbing systems, under low residual chlorine conditions, promoted a more significant growth of biofilm and led to a greater rate reduction of disinfection by-products in DCI pipe than in STS pipe. While the level of THMs (trihalomethanes) increased under conditions of low biofilm concentration, the levels of HAAs (halo acetic acids) and CH (chloral hydrate) decreased in all cases in proportion to the amount of biofilm. It was also observed that chloroform, the main species of THM, was not readily decomposed biologically and decomposition was not proportional to the biofilm concentration; however, it was easily biodegraded after the addition of phosphate. Analysis of the 16S rDNA sequences of 102 biofilm isolates revealed that Proteobacteria (50%) was the most frequently detected phylum, followed by Firmicutes (10%) and Actinobacteria (2%), with 37% of the bacteria unclassified. Bradyrhizobium was the dominant genus on corroded DCI pipe, while Sphingomonas was predominant on non-corroded STS pipe. Methylobacterium and Afipia were detected only in the reactor without added phosphate. PCR-DGGE analysis showed that the diversity of species in biofilm tended to increase when phosphate was added regardless of the pipe material, indicating that phosphate addition upset the biological stability in the plumbing systems.

  5. Evaluation of DSA effects on SA516-Gr. 70 steel for reactor coolant piping elbow material. (Dynamic and quasi-static J-R curve characteristics.)

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Bong Sang; Hong, Jun Hwa; Yoon, Ji Hyun; Oh, Jong Myung; Kim, Jin Won [Korea Atomic Energy Reserach Institute, Taejon (Korea, Republic of)

    1997-11-01

    Dynamic and quasi-static J-R curve tests for RCS piping elbow material (SA516-Gr.70) were performed by DCPD method at various temperatures (25 deg C - 316 deg C). The objective of this project was to qualify that DSA would not affect the design safety margin for LBB analysis in the normal operating temperature region. This report describes the effects of temperature and loading rate on J-R characteristics of SA516-Gr. 70 steel for reactor coolant piping elbow material. 13 refs., 3 tabs., 9 figs. (author)

  6. Flow accelerated corrosion of carbon steel feeder pipes from pressurized heavy water reactors

    Science.gov (United States)

    Singh, J. L.; Kumar, Umesh; Kumawat, N.; Kumar, Sunil; Kain, Vivekanand; Anantharaman, S.; Sinha, A. K.

    2012-10-01

    Detailed investigation of a number of feeder pipes received from Rajasthan Atomic Power Station Unit 2 (RAPS#2) after en-masse feeder pipe replacement after 15.67 Effective Full Power Years (EFPYs) was carried out. Investigations included ultrasonic thickness measurement by ultrasonic testing, optical microscopy, scanning electron microscopy, chemical analysis and X-ray Diffraction (XRD). Results showed that maximum thickness reduction of the feeder had occurred downstream and close to the weld in 32 NB (1.25″/32.75 mm ID) elbows. Rate of Flow Accelerated Corrosion (FAC) was measured to be higher in the lower diameter feeder pipes due to high flow velocity and turbulence. Weld regions had thinned to a lower extent than the parent material due to higher chromium content in the weld. A weld protrusion has been shown to add to the thinning due to FAC and lead to faster thinning rate at localized regions. Surface morphology of inner surface of feeder had shown different size scallop pattern over the weld and parent material. Inter-granular cracks were also observed along the weld fusion line and in the parent material in 32 NB outlet feeder elbow.

  7. 波纹管圆柱定型模板施工技术%CONSTRUCTION TECHNIQUE OF TYPIFIED FORMWORK FOR CORRUGATED TUBE COLUMN

    Institute of Scientific and Technical Information of China (English)

    李海生; 张肇庆; 胡志军; 王洋; 章亮亮

    2011-01-01

    In the column construction of ZTE Nanjing Research and Development Center No.l Building, high-density polyethylene double-wall corrugated tubes with same diameter are used for formwork, which has smooth inner wall, high strength, light weight and annular corrugated outer wall. The pipe rigidity is increased obviously to avoid deformation; two semicircles are connected together to reduce the number of joint and to improve the forming quality of concrete after the formwork is removed. Compared with same type of typified steel formwork, the corrugated tube formwork has lower cost, more convenient construction and better economic benefit.%中兴通讯南京研发中心1号楼圆柱施工中,采用了直径相同的高密度聚乙烯双壁波纹管作为模板,该模板内壁光滑、强度高、重量轻,外壁呈现环波纹状结构,增加了管材的刚度,且不易变形;采用两个半圆组拼,减少了拼缝,可提高混凝土拆模后的成型质量.波纹管模板价格远低于同类型的定型钢模板,且施工方便,可取得较好的经济效益.

  8. DRAFT One Year Extension of the Short-Term National Product Waiver for Stainless Steel Nuts and Bolts used in Pipe Couplings, Restraints, Joints, Flanges and Saddles for State Revolving Fund Projects

    Science.gov (United States)

    DRAFT one year extension of the short-term national product waiver for stainless steel nuts and bolts used in pipe couplings, restraints, joints, flanges and saddles for State Revolving Fund projects.

  9. 75 FR 973 - Certain Welded Stainless Steel Pipes From the Republic of Korea: Preliminary Results of...

    Science.gov (United States)

    2010-01-07

    ... promotion, order input/ processing, invoicing, collection of payment, sales forecasting, sales marketing... review covers one respondent, SeAH Steel Corporation (SeAH). We preliminarily determine that sales made... through D of its questionnaires (i.e., the sections relating to sales to the home and U.S. markets...

  10. 马氏体不锈钢HFW管线管的开发%Development of Weldable Martensitic Stainless Steel Line Pipe by HFW Process

    Institute of Scientific and Technical Information of China (English)

    肖国章; 高霞; 马星; 赵波锋

    2014-01-01

    A new type of martensitic stainless steel line pipe having excellent weldability and high corrosion resistance in wet CO2 environments manufactured by the high-frequency electric-resistance welding (HFW) process was developed. Through optimized design alloy composition, metallographic structure observation, mechanical property test, the steel pipe external dimension and anticorrosion performance test, the external dimension, mechanical properties of base metal and weld, and metallographic structure of the developed steel pipe can meet the design requirements. The test results showed that the new martensitic stainless steel can produce thin-walled and high precision line pipe, the gas shield welding techniques can be used in HFW; preheat before welding and heat treatment after welding don’t need for HFW steel pipe, the pipe body and weld can satisfy the condition of wet CO2 in oil and gas well.%研究开发了一种具有良好可焊性和抗湿CO2腐蚀的马氏体不锈钢合金及HFW焊管。通过合金成分优化设计、金相组织观察、力学性能试验、钢管外观尺寸及防腐性能试验,所开发的钢管外观尺寸、母材和焊缝的力学性能及金相组织等满足设计目标要求,与传统马氏体不锈钢管相比,具有更精确的外观尺寸。试验结果表明,新型可焊接马氏体不锈钢可以生产薄壁高精度管线管,可以用气体保护技术进行HFW焊接; HFW钢管不需焊前预热和焊后热处理,管体及焊缝所有性能满足油气井湿CO2腐蚀的服役环境。

  11. Properties and Microstructure of Laser Welded VM12-SHC Steel Pipes Joints

    Directory of Open Access Journals (Sweden)

    Skrzypczyk A.

    2016-06-01

    Full Text Available Paper presents results of microstructure and tests of welded joints of new generation VM12-SHC martensitic steel using high power CO2 laser (LBW method with bifocal welding head. VM12-SHC is dedicated to energetic installation material, designed to replace currently used. High content of chromium and others alloying elements improve its resistance and strength characteristic. Use of VM12-SHC steel for production of the superheaters, heating chambers and walls in steam boilers resulted in various weldability researches. In article are presented results of destructive and non-destructive tests. For destructive: static bending and Vickers hardness tests, and for non-destructive: VT, RT, UT, micro and macroscopic tests were performed.

  12. Using Phased Array Ultrasonic Testing in Lieu of Radiography for Acceptance of Carbon Steel Piping Welds

    Energy Technology Data Exchange (ETDEWEB)

    Moran, Traci L.; Anderson, Michael T.; Cinson, Anthony D.; Crawford, Susan L.; Nove, Carol A.

    2014-08-01

    The Pacific Northwest National Laboratory (PNNL) is conducting studies for the U.S. Nuclear Regulatory Commission (NRC) to assess the capability, effectiveness, and reliability of ultrasonic testing (UT) as a replacement method for radiographic testing (RT) for volumetric examination of nuclear power plant (NPP) components. This particular study focused on evaluating the use of UT on carbon steel plate welds. Welding fabrication flaws included a combination of planar and volumetric types, e.g., incomplete fusion, lack of penetration, cracks, porosity, and slag inclusions. The examinations were conducted using phased-array (PA) UT techniques applied primarily for detection and flaw type characterization. This paper will discuss the results of using UT in lieu of RT for detection and classification of fabrication flaws in carbon steel plate welds.

  13. X-ray diffraction study of microstructural changes during fatigue damage initiation in pipe steels: Role of the initial dislocation structure

    Energy Technology Data Exchange (ETDEWEB)

    Pinheiro, B., E-mail: bianca@lts.coppe.ufrj.br [Laboratory of Mechanics of Lille (LML), UMR CNRS 8107, University Lille 1, Boulevard Paul Langevin, Cité Scientifique, 59655 Villeneuve d' Ascq (France); Lesage, J. [Laboratory of Mechanics of Lille (LML), UMR CNRS 8107, University Lille 1, Boulevard Paul Langevin, Cité Scientifique, 59655 Villeneuve d' Ascq (France); Pasqualino, I. [Subsea Technology Laboratory (LTS), Ocean Engineering Department, COPPE/Federal University of Rio de Janeiro, PO Box 68508, Cidade Universitária, CEP 21945-970, Rio de Janeiro/RJ (Brazil); Bemporad, E. [University of Rome “ROMA TRE”, Mechanical and Industrial Eng. Dept., Via Vasca Navale 79, 00146 Rome (Italy); Benseddiq, N. [Laboratory of Mechanics of Lille (LML), UMR CNRS 8107, University Lille 1, Boulevard Paul Langevin, Cité Scientifique, 59655 Villeneuve d' Ascq (France)

    2013-09-15

    The present work is the second part of an ongoing study of microstructural changes during fatigue damage initiation in pipe steels [B. Pinheiro et al., Mat. Sci. Eng., A 532 (2012) 158–166]. Microdeformations and residual stresses (macrostresses) are evaluated by X-ray diffraction during alternating bending fatigue tests on samples taken from an API 5L X60 grade steel pipe. Microdeformations are evaluated from the full width at half maximum (FWHM) of the diffraction peak and residual stresses are estimated from the peak shift. Here, to understand the role of the initial dislocation structure, annealed samples are considered. As previously found for as-machined samples, the evolution of microdeformations shows three regular successive stages, but now with an increase during the first stage. The amplitude of each stage is accentuated with increasing stress amplitude, while its duration is reduced. Residual stresses show a similar trend, with stages of the same durations than those observed for FWHM, respectively. Additionally, changes in density and distribution of dislocations are observed by transmission electron microscopy combined with the technique of focused ion beam. The results are very encouraging for the development of a future indicator of fatigue damage initiation for pipe steels based on microstructural changes measured by X-ray diffraction.

  14. Wall Thinning Analysis of Carbon Steel Pipes in Nuclear Power Plants%核电厂碳钢管道壁厚减薄原因分析

    Institute of Scientific and Technical Information of China (English)

    马娜; 尹昌耕; 秦金光

    2013-01-01

    The wall-thinning problem of carbon steel pipes causes great attention at present because of the accidents happened in nuclear power plants. This paper introduces the wall thinning research of carbon steel pipes in the conventional island of a nuclear power plant Operation condition analysis, chemical composition analysis, metallic phase analysis, micrographic examination, and XRD analysis are performed. According to the analysis above mentioned, the reasons of carbon steel pipes wall-thinning in this nuclear power plant are erosion-corrosion, cavitation, and flow accelerated corrosion, respectively.%近年来,核电厂二回路管道破裂引起的安全事故使得碳钢管道减薄问题受到越来越多关注.本文以某核电厂大修时发现壁厚减薄超标而更换下来的管道作为研究对象,通过成分分析、微观形貌分析和氧化膜分析等手段,结合管道的运行工况环境分析,最终确定管道壁厚减薄模式分别为冲刷腐蚀、流动加速腐蚀和汽蚀,并提出针对性改进措施.

  15. Fatigue behaviour of welded joints assembled by longitudinal corrugated plates

    Institute of Scientific and Technical Information of China (English)

    王志宇; 王清远; 刘永杰; 孙美

    2015-01-01

    Fatigue is usually the cause for the cracks identified at bridge elements in service. With an increase in the introduction of corrugated steel web girders in recent highway bridge construction, the understanding of the fatigue behaviour of welded details in such structures becomes an important issue for the design. The typical welded details were represented as welded joints assembled by longitudinal corrugated plates. All the experiments were performed under fatigue loading using a servo-control testing machine. The test results from the failure mode observation with the aid of infrared thermo-graph technology show that the failure manner of these welded joints is comparable to that of the corrugated steel web beams reported previously. It is indicated from the stiffness degradation analysis that the welded joints with larger corrugation angle have higher stiffness and greater stiffness degradation in the notable stiffness degradation range. It is shown from the testS−N relations based on the free regression and forced regression analyses that there is a good linear dependence between lg(N) and lg(ΔS). It is also demonstrated that the proposed fracture mechanics analytical model is able to give a prediction slightly lower but on the safe side for the mean stresses at 2 million cycles of the test welded joints.

  16. Prediction of Weld Quality of A Tungsten Inertr Gas Welded Mild Steel Pipe Joint Using Response Surface Methodology (Rsm

    Directory of Open Access Journals (Sweden)

    I.U. Abhulimen

    2014-08-01

    Full Text Available The weld quality of tungsten inert gas (TIG welded joint has been investigated to identify the most economical weld parameters that will bring about optimum properties. Response surface methodology has been used in the optimization of the tungsten inert gas weld of mild steel pipes. Response surface methodology, based on the central composite face centered design was generated for the purpose of optimization of the weld quality.All the process parameters have desirability of 1. Tensile strength response for this solution have a desirability of 0.910595 and the yield strength of 0.59. Result showed that minimizing current and voltage an average tensile strength of 535.452MPa and yield strength of up to 408.74MPa can be achieved, while keeping gas flow rate and electrode diameter within the range of test. It was also deduced that tensile elongation of the TIG weld is not influenced by the process parameters selected for the purpose of this study.

  17. Numerical analysis of sandwich beam with corrugated core under three-point bending

    Energy Technology Data Exchange (ETDEWEB)

    Wittenbeck, Leszek [Poznan University of Technology, Institute of Mathematics Piotrowo Street No. 5, 60-965 Poznan (Poland); Grygorowicz, Magdalena; Paczos, Piotr [Poznan University of Technology, Institute of Applied Mechanics Jana Pawla IIStreet No. 24, 60-965 Poznan (Poland)

    2015-03-10

    The strength problem of sandwich beam with corrugated core under three-point bending is presented.The beam are made of steel and formed by three mutually orthogonal corrugated layers. The finite element analysis (FEA) of the sandwich beam is performed with the use of the FEM system - ABAQUS. The relationship between the applied load and deflection in three-point bending is considered.

  18. Creep properties and microstructure evaluation of weld joint of the pipe made of P92 steel

    Energy Technology Data Exchange (ETDEWEB)

    Kasl, Josef; Jandova, Dagmar; Chvostova, Eva [SKODA VYZKUM s.r.o., Plzen (Czech Republic); Folkova, Eva [SKODA POWER a.s., Plzen (Czech Republic)

    2010-07-01

    One-side weld joint of W type was prepared from P92 type steel using GTAW and SMAW method. Creep test to the rupture of smooth cross-weld samples has been carried out at temperatures ranging from 575 to 650 C and at stresses from 70 to 240 MPa. Fractographic analysis, hardness measurement and detailed study of submicrostructure have been performed using light, scanning and transmission electron microscopy. Changes of microstructure were correlated with the creep strength. Increase in size of secondary phases and cavities formation were evident after creep tests at temperatures above 575 C. Voids were concentrated in the fine prior austenite grain heat affected zones, where fracture occurred. In addition, a sporadic occurrence of individual cavities was found out in the base material and the weld metal after tests at 625 and 650 C. During creep exposures at temperatures above 600 C Laves phase precipitated. (orig.)

  19. Critical buckling strain in high strength steel pipes using isotropic kinematic hardening

    Energy Technology Data Exchange (ETDEWEB)

    Fathi, A.; Roger Cheng, J. J.; Adeeb, Samer [Department of Civil and Environmental Engineering, University of Alberta (Canada); Zhou, Joe [TransCanada Pipelines Ltd. (Canada)

    2010-07-01

    In the natural gas sector, the use of high strength steel pipelines (HSSP) to transport huge volumes over long distances is increasing as it yields important savings in both capital and operational expenditures. In order to design HSSP, the critical buckling strain as to be taken into consideration but the models so far developed have been for isotropic materials while important material anisotropy is observed on HSSP due to their manufacturing process. The paper presents a model to assess the critical buckling strain of HSSP. An isotropic-kinematic hardening material model was developed and isotropic and anisotropic models were used to simulate pressurized and non-pressurized HSSP and were compared to test results. Results showed that the isotropic model is not suitable for predicting the buckling strain of HSSP but that the isotropic-kinematic hardening material model is. A model to better predict the buckling strain of HSSP was developed and successfully tested herein.

  20. Heat Pipe Materials Compatibility

    Science.gov (United States)

    Eninger, J. E.; Fleischman, G. L.; Luedke, E. E.

    1976-01-01

    An experimental program to evaluate noncondensable gas generation in ammonia heat pipes was completed. A total of 37 heat pipes made of aluminum, stainless steel and combinations of these materials were processed by various techniques, operated at different temperatures and tested at low temperature to quantitatively determine gas generation rates. In order of increasing stability are aluminum/stainless combination, all aluminum and all stainless heat pipes. One interesting result is the identification of intentionally introduced water in the ammonia during a reflux step as a means of surface passivation to reduce gas generation in stainless-steel/aluminum heat pipes.

  1. 高强度钻杆钢疲劳性能试验研究∗%Study on fatigue property of High-strength Drill Pipe Steels

    Institute of Scientific and Technical Information of China (English)

    刘飞; 邓天安; 周仕明; 曾德智

    2016-01-01

    In order to solve fatigue fracture of drilling tools, fatigue property of 165ksi and S135 drill pipe steels is studied by rotary bending fatigue test�Based on Basquin model, fatigue limit distribution of middle⁃long life zone is proposed for two high⁃strength drill pipe steels�Research results show that, under confidence level of 95% and reliability of 50%, 90% and 99%, the fatigue limit of 165ksi drill pipe steel is respectively 662�54, 645�92 and 632�28 MPa and that of S135 drill pipe steel is respectively 595�83, 541�87 and 529�73 MPa�In ad⁃dition, a complete stress⁃fatigue life S⁃N curve is obtained for two high⁃strength drill pipe steels�The results can provide basic data and theoretical basis for drill pipe material selection and reliability design of deep wells and ex⁃tradeep wells.%针对钻井过程中钻具疲劳断裂问题,采用旋转弯曲疲劳试验研究了S135和165ksi 2种高强度钻杆钢的疲劳性能。基于Basquin模型得出2种高强度钻杆钢中长寿命区的疲劳极限分布。研究结果表明,取95%的置信水平,则50%、90%和99%可靠度下的165ksi钻杆钢的疲劳极限分别为662�54、645�92和632�28 MPa, S135钻杆钢的疲劳极限分别为595�83、541�87和529�73 MPa,并得出了2种高强度钻杆钢完整的应力⁃疲劳寿命S⁃N曲线。试验结果可以为深井、超深井钻杆选材及可靠性设计提供基础数据和理论依据。

  2. A Simple Experiment to Explore Standing Waves in a Flexible Corrugated Sound Tube

    Science.gov (United States)

    Amorim, Maria Eva; Sousa, Teresa Delmira; Carvalho, P. Simeao; Sousa, Adriano Sampaioe

    2011-01-01

    Sound tubes, pipes, and singing rods are used as musical instruments and as toys to perform amusing experiments. In particular, corrugated tubes present unique characteristics with respect to the sounds they can produce; that is why they have been studied so intensively, both at theoretical and experimental levels. Experimental studies usually…

  3. Effects of Induction Heat Bending Process on Microstructure and Corrosion Properties of ASME SA312 Gr.TP304 Stainless Steel Pipes

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Nam In; Kim, Young Sik [Andong National University, Andong (Korea, Republic of); Kim, Kyung Soo; Chang, Hyun Young; Park, Heung Bae; Sung, Gi Ho [KEPCO Engineering and Construction Company, Seongnam (Korea, Republic of); Sung, Gi Ho [R and D Center, Busan (Korea, Republic of)

    2015-06-15

    The usage of bending products recently have increased since many industries such as automobile, aerospace, shipbuilding, and chemical plants need the application of pipings. Bending process is one of the inevitable steps to fabricate the facilities. Induction heat bending is composed of compressive bending process by local heating and cooling. This work focused on the effect of induction heat bending process on the properties of ASME SA312 Gr. TP304 stainless steel pipes. Tests were performed for base metal and bended area including extrados, intrados, crown up, and down parts. Microstructure was analyzed using an optical microscope and SEM. In order to determine intergranular corrosion resistance, Double Loop Electrochemical Potentiokinetic Reactivation (DL-EPR) test and ASTM A262 practice A and C tests were done. Every specimen revealed non-metallic inclusion free under the criteria of 1.5i of the standard and the induction heat bending process did not affect the non-metallic inclusion in the alloys. Also, all the bended specimens had finer grain size than ASTM grain size number 5 corresponding to the grain sizes of the base metal and thus the grain size of the pipe bended by induction heat bending process is acceptable. Hardness of transition start, bend, and transition end areas of ASME SA312 TP304 stainless steel was a little higher than that of base metal. Intergranular corrosion behavior was determined by ASTM A262 practice A and C and DL-EPR test, and respectively step structure, corrosion rate under 0.3 mm/y, and Degree of Sensitization (DOS) of 0.001 - 0.075 % were obtained. That is, the induction heat bending process didn't affect the intergranular corrosion behavior of ASME SA312 TP304 stainless steel.

  4. Overlay welding for corrugating roll

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    The effects of chemical compositions and microstructures on wearability properties of overlaid corrugating roll were studied, and the factors governing the hardness and the wearability of overlaid layer were explored.The results show that the hardness and wearability of the overlaid layer significantly rise with the increase of the mass fraction of various types of eutectic, but the crack-resistance falls. The chief factor governing the hardness of overlaid layer is the matrix microstructure, especially the amount of austenite; and the second is the amount of carbide. The principal factor governing the wearability of overlaid layer is the amount of special carbide, particularly the amount of eutectic; and the second is the hardness of overlaid layer. Meanwhile, high alloying electrodes may cause the gear-surface hardness of corrugating roll to be higher than 63HRc, and may enhance the wearability of the gear-surface of corrugating roll by a factor of 5.63 and 9.08.

  5. Degradation of the pipe-steel structure upon long-term operation in contact with a hydrogen sulfide-containing medium

    Science.gov (United States)

    Schastlivtsev, V. M.; Tabatchnikova, T. I.; Tereshchenko, N. A.; Yakovleva, I. L.

    2011-03-01

    The phase composition and structure of defect portions of pipelines after long-term service in contact with a hydrogen sulfide-containing medium have been investigated. From structural changes, the process of the initiation of cracks and fracture of a low-carbon ferritic-pearlitic steel containing slag-induced laminations and precipitates of sulfides of the (Fe,Mn)S type has been reconstructed. The conditions under which a block cementite substructure is formed in the course of service and a transformation of the plate-type shape of the carbide phase occurs have been analyzed. It has been established that the dispersed carbides precipitating in this case limit the mobility of dislocations and thereby favor degradation of service properties of the pipe steel.

  6. The design of ellipticity of tension reduce pass for steel pipe%钢管张力减径孔型椭圆度的设计

    Institute of Scientific and Technical Information of China (English)

    于俊春

    2001-01-01

    The paper introduced the ellipticity design method of tension reduce pass of Φ89mm welded steel tube unit which imported from German by Chengde Wanli Steel Pipe Co., Ltd. The design based on ellipticity calculation methods of the traditional circular and ellipse pass. The practice shows that the defects, such as inner polygonal of thick tube and folding ear of thin tube, are eliminated%介绍了承德万利钢管有限公司从德国引进的Φ89mm焊管机组张力减径孔型采用了介于传统椭圆孔型和圆孔型椭圆度计算的设计方法。此法消除了厚壁钢管内多边形和薄壁钢管挤入辊缝的缺陷。

  7. 77 FR 41967 - Certain Circular Welded Carbon Steel Pipes and Tubes From India, Thailand, and Turkey; Certain...

    Science.gov (United States)

    2012-07-17

    ... and Border Protection will continue to collect cash deposits at the rates in effect at the time of... finished conduit. Standard pipe that is dual or triple certified/ stenciled that enters the U.S. as line... hollows for redraws, finished scaffolding, and finished conduit. Standard pipe that is dual or triple...

  8. The New Development of Welded Steel Pipe Technology%焊接钢管技术的新进展

    Institute of Scientific and Technical Information of China (English)

    王晓香

    2011-01-01

    This paper introduced the new development of the international line pipe technology during the recent decadc from several aspects, such as onshore natural gas line pipe, offshore natural gas line pipe, large deformation pipe and ultra-high strength line pipe;the construction and development of the modem information system in welded pipe corporation,and the advancement in production technology and equipment of the high-frequency longitudinal welded pipe, SAWH pipe and SAWL pipe. It suggested that China welded pipe corporations should accelerate the renovation and upgrading the equipment to meet the requirements of the line pipe with high properties, high grade, heavy wall thickness and high precision; updating the NDT equipment thoroughly to ensure it works reliable; to realize aatomatization from the foundation to whole-line through the information renovation, and then enhance competitive strength of China welded pipe corporations.%介绍了近十几年国际管线钢管技术的新进展,包括陆地天然气管道用管、海底天然气管道用管以及大应变钢管和超高强度管线钢管的开发;焊管企业的现代化信息系统的建设及发展;我国高频直缝焊管、螺旋埋弧焊管和直缝埋弧焊管生产技术和装备的技术进步.建议我国焊管企业应加快设备改造和升级,以适应管线管向高性能、高钢级、大壁厚和高尺寸精度发展的要求;对无损探伤设备进行彻底更新,保证其可靠工作;通过信息化改造,实现从基础自动化到全线自动化、信息化的飞跃,进一步增强我国焊管企业的竞争力.

  9. 工字钢悬挑与钢管斜撑支撑体系的研究与应用%On study and application of support system of rolled steel cantilever and tilted-support of steel pipe

    Institute of Scientific and Technical Information of China (English)

    赵宝玉

    2012-01-01

    以山西饭店旧楼改造工程为工程实例,从构造措施、施工方案、材料质量要求、施工安全措施等方面对超长、超高工字钢悬挑与钢管斜撑支撑体系进行了阐述与分析,为旧楼改造提供了新的思路。%Taking the old building reconstruction of Shanxi Restaurant as the engineering case,the paper illustrates and analyzes the support system of the super-long,super-high rolled steel cantilever and the tilted-supported steel pipe from the structure measures,the construction scheme,the requirements for material quality,and the safety measures of the construction,so as to provide the new idea for the old building reconstruction.

  10. Optimization of hot rolling process for API-X60 grade line pipe steel with lower yield/tensile ratio for ERW pipe application

    Energy Technology Data Exchange (ETDEWEB)

    Ro, K.S.; Arikere, B.; Sarkar, B.K.; Nagaraj, N.K.; Al-Shammary, S.; Al-Butairi, A. [Saudi Iron and Steel Co., Al-Jubail (Saudi Arabia)

    2004-07-01

    This paper described trials conducted to achieve a yield-to-tensile ratio lower than 0.85 for API X60 line pipes. The trials were based on the parameters affecting the mechanical and physical properties of hot-rolled coils. The production scale trials were performed by controlling: (1) finish rolling temperature; (2) coiling temperature; (3) cooling rates. The study also aimed to determine the effect of grain size and microstructure on yield-to-tensile ratios. A high reduction at approximately 1050 degrees C was provided at the roughing mill to ensure a transfer bar with a fine recrystallized austenitic grain size. A laminar cooling strategy was used to achieve a smaller grain size as well as to transform the austenites to ferrite and pearlite. A higher cooling rate (CR) was used to increase ferrite nucleation sites. Photomicrographs were used to show differences in grain size, grain shape, and the distribution of pearlite in the samples. A volume fraction analysis showed that the pearlite content varied from 8 per cent to 11 per cent in the trials. Samples for testing were collected from pipes made using a cage-forming process and a linear forming process. Results showed that the average yield strength drop from coil to pipe was 43.2 MPa, with a range of 30 to 90 MPa. Significant differences in yield strength drop were noted for the linear forming and cage forming processes. Results suggested that higher deformation temperatures combined with normal coiling temperatures and consistent water cooling patterns will provide optimum yield and tensile strengths with lower yield ratios. It was concluded that that a yield-to-tensile ratio of 0.84-0.88 can be achieved with API-X60 hot-rolled coils using the new process. 8 refs., 4 tabs., 6 figs.

  11. 77 FR 32508 - Circular Welded Carbon Steel Pipes and Tubes From Turkey: Notice of Preliminary Results of...

    Science.gov (United States)

    2012-06-01

    ... this order, except for line pipe, oil country tubular goods, boiler tubing, cold- drawn or cold-rolled... examined stages in the marketing process and selling functions along the chain of distribution between the...

  12. Development of WELDABLE12CR stainless steel seamless pipe with superior weldability and corrosion resistance for linepipe application; Yosetsusei oyobi taishokusei ni sugureta linepipe yo stainless keimokumukokan WELDABLE12CR no kaihatsu

    Energy Technology Data Exchange (ETDEWEB)

    Miyata, Y.; Kimura, M.; Toyooka, T.; Nakano, Y.; Murase, F. [Kawasaki Steel Corp., Tokyo (Japan)

    1998-06-20

    Severe corrosive circumstance of oil wells and gas wells including high temperature, high CO2 partial pressure, high chlorine ion concentration, and further H2S are becoming more and more serious in recent years. Measures to prevent CO2 corrosion and sulfide stress crack are necessary for pipelines called flowlines and gathering line for transporting oil or gas which has severe corrosivity before treatment. WELDABLE12CR steel pipe which is seamless martensite stainless steel with excellent weldability and corrosion resistance is developed by the present authors. There two kinds of such steel pipes, one is 11Cr steel (0.01C-11Cr-1.5Ni-0.5Cu-0.01N-based steel) that is superior in corrosion resistance to 13Cr steel for oil well so that it can be used in CO2 circumstance, and the other one is 12Cr steel (0.01C-12Cr-5Ni-2Mo-0.01N-based steel) that has excellent SSC-resistance thus being used in the circumstance containing CO2 and a trace quantity of H2S. 5 refs., 4 figs., 3 tabs.

  13. 49 CFR 195.112 - New pipe.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 3 2010-10-01 2010-10-01 false New pipe. 195.112 Section 195.112 Transportation... PIPELINE Design Requirements § 195.112 New pipe. Any new pipe installed in a pipeline system must comply with the following: (a) The pipe must be made of steel of the carbon, low alloy-high strength, or alloy...

  14. 变电构架中Q235~Q420牌号角钢和钢管适用性分析%Applicability analysis of Q235 ~ Q420 angle steels and steel pipes in substation frame

    Institute of Scientific and Technical Information of China (English)

    万红; 彭奕亮; 李洪波; 杨光; 韩选民; 徐茂行

    2011-01-01

    为研究不同牌号角钢和钢管在变电构架中的适用范围,应用有关规范对Q235~Q420轴心受压角钢和钢管、单向偏心受压钢管以及纯弯钢管的承载力比值进行了大量计算分析.结果表明:相对于一般规格轴心受压Q235角钢和钢管,Q345,Q390,Q420钢材的长细比经济适用范围分别为λ≤100,λ≤110和λ≤120;相对于一般规格轴心受压Q345角钢和钢管,Q390和Q420钢材的长细比经济适用范围分别为λ≤40和λ≤70;高强钢应用于单向压弯钢管和纯弯钢管时,其经济性能将得以充分发挥.%To study the applicability of Q235 ~ Q420 angle steels and steel pipes in substation frame, the load carrying capacity ratio of Q235 - Q420 axial compressive angle steels and steel pipes, eccentrically loaded and pure bending steel pipes were analyzed according to some relevant standards. Four kinds of steels have been considered: Q235, Q345, Q390, Q420. The results show that relative to general Q235 axial compressive angle steels and steel pipes,economic application scope of slenderness ratio for Q345 ,Q390 and Q420 steel are λ≤ 100, λ≤ 110 andλ≤ 120 respectively. Relative to general Q345 axial compressive angle steels and steel pipes, economic application scope of slenderness ratio for Q390 and Q420 are λ≤40 and λ≤ 70 respectively. Good economic results will be obtained for high strength steels used in eccentrically loaded and pure bending steel pipes.

  15. 76 FR 72173 - Circular Welded Carbon-Quality Steel Pipe From India, the Sultanate of Oman, the United Arab...

    Science.gov (United States)

    2011-11-22

    ... Steel Development Fund Support K. Special Economic Zones (``SEZ'') Programs 1. Duty-Free Importation of.... Preferential Lending 1. Preferential Export Lending 2. Dubai Commodity Receipts For further...

  16. Corrugated Membrane Fuel Cell Structures

    Energy Technology Data Exchange (ETDEWEB)

    Grot, Stephen [President, Ion Power Inc.

    2013-09-30

    One of the most challenging aspects of traditional PEM fuel cell stacks is the difficulty achieving the platinum catalyst utilization target of 0.2 gPt/kWe set forth by the DOE. Good catalyst utilization can be achieved with state-of-the-art catalyst coated membranes (CCM) when low catalyst loadings (<0.3 mg/cm2) are used at a low current. However, when low platinum loadings are used, the peak power density is lower than conventional loadings, requiring a larger total active area and a larger bipolar plate. This results in a lower overall stack power density not meeting the DOE target. By corrugating the fuel cell membrane electrode structure, Ion Power?s goal is to realize both the Pt utilization targets as well as the power density targets of the DOE. This will be achieved by demonstrating a fuel cell single cell (50 cm2) with a twofold increase in the membrane active area over the geometric area of the cell by corrugating the MEA structure. The corrugating structure must be able to demonstrate the target properties of < 10 mOhm-cm2 electrical resistance at > 20 psi compressive strength over the active area, in combination with offering at least 80% of power density that can be achieved by using the same MEA in a flat plate structure. Corrugated membrane fuel cell structures also have the potential to meet DOE power density targets by essentially packaging more membrane area into the same fuel cell volume as compared to conventional stack constructions.

  17. 基于钢管材料的现代金属家具创新设计%Mordern Metal Furniture Design Innovation Based on Steel Pipe

    Institute of Scientific and Technical Information of China (English)

    潘文芳

    2016-01-01

    The writer recalls the development process of steel pipe furniture, summarizes the innovative methods of modern furniture design, such as technology and process innovation, multifunctional design, composition and proportion of design, visual language design, and proposed the design direction of traditional culture elements combining with modern steel pipe material. The group designed steel pipe furniture quite similar but different from the prototype on the basis of the Ming Dynasty furniture styling and humanistic spirit analysis, through the decorative symbols simplifying and extraction. The traditional cultural elements weakens the cold sense of metal furniture, and enhances the cultural properties and aesthetic tastes. To get series of design, the group referenced modular design thinking, maintained the same frame, and only took the brain shape changed.%回顾钢管家具的发展历程,总结了现代家具的创新设计方法,如技术与工艺的创新,多功能设计,构成与比例的设计,视觉语言的设计,提出传统文化元素与现代钢管材料结合的设计方向。在对明代家具的造型特征和人文精神进行分析的基础上,对明代家具的装饰符号进行抽取和简化,结合钢管的造型特点,设计出与原型神似而形异的钢管家具。融入传统文化元素,弱化了金属家具的冷峻感,增强金属家具的文化属性和审美趣味。借鉴模块化设计思想,保持座面及框架不变,改变搭脑的形态获得系列设计。

  18. Optimum Design of Composite Corrugated Web Beams Using Hunting Search Algorithm

    Directory of Open Access Journals (Sweden)

    Ferhat Erdal

    2017-07-01

    Full Text Available Over the past few years there has been sustainable development in the steel and composite construction technology. One of the recent additions to such developments is the I-girders with corrugated web beams. The use of these new generation beams results in a range of benefits, including flexible, free internal spaces and reduced foundation costs. Corrugated web beams are built-up girders with a thin-walled, corrugated web and wide plate flanges. The thin corrugated web affords a significant weight reduction of these beams, compared with hot-rolled or welded ones. In this paper, optimum design of corrugated composite beams is presented. A recent stochastic optimization algorithm coded that is based on hunting search is used for obtaining the solution of the design problem. In the optimisation process, besides the thickness of concrete slab and studs, web height and thickness, distance between the peaks of the two curves, the width and thickness of flange are considered as design variables. The design constraints are respectively implemented from BS EN1993-1:2005 (Annex-D, Eurocode 3 BS-8110 and DIN 18-800 Teil-1. Furthermore, these selections are also carried out such that the design limitations are satisfied and the weight of the composite corrugated web beam is the minimum.

  19. Utilization of the equipment and program cine- and telerecording complex for the high-frequency steel pipe welding investigation

    Science.gov (United States)

    Konovalov, Nikolai A.; Veselovsky, Vladimir B.; Furmanov, Valeri B.; Kovalenko, Vladimir I.; Lakhno, Nikolay I.; Kovika, Nikolai D.; Novikov, Leonid V.; Scherbina, Vadim N.; Zlydennaya, Lyubov M.

    1995-08-01

    With the aim of technological process automatization and control for high-frequency welding of different diameter pipes, the machine-program complex (APC) was designed. APC gives the opportunity to create the cine- and telerecording of process in production conditions at the mill '159-529' of the Novomoskovsky Tube Rolling Mill, Ukraine). With the help of APC in real functioning mill conditions, the character of flashing zone length changing and the angle of convergence depending on pipe welding speed was investigated. Also the zone of jumpers is defined. The comparison of theoretical and experimental data gave an opportunity to define a welding rate which is optimal for the most qualitative values of welded joints in the range of pipe products of mill '159-529'.

  20. A Simple Experiment to Explore Standing Waves in a Flexible Corrugated Sound Tube

    Science.gov (United States)

    Amorim, Maria Eva; Sousa, Teresa Delmira; Carvalho, P. Simeão; Sousa, Adriano Sampaioe

    2011-09-01

    Sound tubes, pipes, and singing rods are used as musical instruments and as toys to perform amusing experiments. In particular, corrugated tubes present unique characteristics with respect to the sounds they can produce; that is why they have been studied so intensively, both at theoretical and experimental levels.1-4 Experimental studies usually involve expensive and sophisticated equipment that is out of reach of school laboratory facilities.3-6 In this paper we show how to investigate quantitatively the sounds produced by a flexible sound tube corrugated on the inside by using educational equipment readily available in school laboratories, such as the oscilloscope, the microphone, the anemometer, and the air pump. We show that it is possible for students to study the discontinuous spectrum of sounds produced by a flexible corrugated tube and go even further, computing the speed of sound in air with a simple experimental procedure.

  1. Chaotic ray propagation in corrugated layers

    Directory of Open Access Journals (Sweden)

    M. Bottiglieri

    2005-01-01

    Full Text Available The aim of this paper is to study the effects of a corrugated wall on the behaviour of propagating rays. Different types of corrugation are considered, using different distributions of the corrugation heights: white Gaussian, power law, self-affine perturbation. In phase space, a prevalent chaotic behaviour of rays, and the presence of a lot of caustics, are observed. These results entail that the KAM theorem is not fulfilled.

  2. Experiment Research of Domestic 55 Steel Grade SEW Expansion Pipe%国产55钢级SEW膨胀管实物试验研究

    Institute of Scientific and Technical Information of China (English)

    韦奉; 李远征; 何石磊; 张峰

    2016-01-01

    In order to assess the comprehensive mechanical properties of domestic 55 steel grade SEW expansion pipe, the expansion test for domestic 55 grade SEW expansion pipe(No. BX55) was conducted by adopting hydraulic expansion method. Meanwhile, the steel pipe size, mechanical properties, internal pressure up to failure and external collapse-resistant strength after expansion pipe were investigated. The results indicated that the starting pressure of BX55(expansion ration up to 11.5%) is 24 MPa, the marching pressure is 22~25 MPa, and the pressure in expansion process is stable. After expansion, the yield strength is 499 MPa, the tensile strength is 562 MPa, the elongation is 29%, and the impact values (1/2-size, 0℃) of base mental and weld are 66 J and 48 J, respectively. The internal pressure exceeds 87% of API SPEC 5 CT requirement value, and the collapse pressure is 9% above the requirement of API RP 5C3. The test results showed that the comprehensive mechanical properties of domestic 55 steel grade SEW expansion pipe is good.%为了评估国产55钢级SEW膨胀管的综合力学性能,采用液压式膨胀方法对国产55钢级SEW膨胀管(牌号为BX55)进行了实物膨胀试验,并对膨胀后钢管的尺寸、力学性能、抗内压至失效、抗外压挤毁性能进行了研究。结果显示, BX55液压膨胀11.5%的启动压力为24 MPa,行进压力为22~25 MPa,膨胀过程的压力平稳;膨胀后管材的屈服强度为499 MPa,抗拉强度为562 MPa,伸长率29%,母材横向和焊缝中心半尺寸试样0℃夏比冲击功分别为66 J和48 J,抗内压至失效压力超出API SPEC 5CT要求值87%,抗外压挤毁强度高于API RP 5C3标准要求值9%。试验结果表明,国产55钢级SEW膨胀管的综合力学性能优良。

  3. 76 FR 67473 - Stainless Steel Butt-Weld Pipe Fittings from Italy, Malaysia, and The Philippines; Institution of...

    Science.gov (United States)

    2011-11-01

    ...-weld pipe fittings from Italy, Malaysia, and the Philippines (71 FR 71530). The Commission is now...), and part 207, subparts A, D, E, and F (19 CFR part 207), as most recently amended at 74 FR 2847... Philippines (66 FR 11257). Following five-year reviews by Commerce and the Commission, effective December...

  4. 76 FR 36086 - Certain Circular Welded Non-Alloy Steel Pipe From Mexico: Final Results of Antidumping Duty...

    Science.gov (United States)

    2011-06-21

    ... pipes and tubes and are intended for the low pressure conveyance of water, steam, natural gas, and other liquids and gases in plumbing and heating systems, air conditioning units, automatic sprinkler systems... States. For the home market, Mueller identified two channels of distribution: Direct shipments (channel...

  5. 75 FR 27987 - Certain Welded Stainless Steel Pipes From the Republic of Korea: Final Results of Antidumping...

    Science.gov (United States)

    2010-05-19

    ... USA, Inc., and Outokumpu Stainless Pipe, Inc. Scope of the Order The merchandise subject to the... set forth by the American Society for Testing and Materials (ASTM) for the welded form of chromium... consumption on or after the publication date of the final results of this ] administrative review, as provided...

  6. 76 FR 77770 - Certain Circular Welded Non-Alloy Steel Pipe From Mexico: Final Results of Antidumping Duty...

    Science.gov (United States)

    2011-12-14

    ... dual or triple certified/stenciled that enters the U.S. as line pipe of a kind used for oil or gas... reminder to importers of their responsibility under 19 CFR 351.402(f)(2) to file a certificate regarding...

  7. 75 FR 20342 - Certain Circular Welded Non-Alloy Steel Pipe From Mexico: Final Results of Antidumping Duty...

    Science.gov (United States)

    2010-04-19

    ... triple certified/stenciled that enters the U.S. as line pipe of a kind used for oil or gas pipelines is... responsibility under 19 CFR 351.402(f)(2) to file a certificate regarding the reimbursement of antidumping duties...

  8. 77 FR 56809 - Certain Small Diameter Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe From...

    Science.gov (United States)

    2012-09-14

    ... process (hot-finished or cold-drawn), end finish (plain end, beveled end, upset end, threaded, or threaded... pressure applications. Finally, also excluded from the order are redraw hollows for cold-drawing when used in the production of cold-drawn pipe or tube. Although the HTSUS subheadings are provided for...

  9. Experimental study on SCC susceptibility of X60 steel using full pipe sections in near-neutral pH environment

    Energy Technology Data Exchange (ETDEWEB)

    Kim, B.A. [Tokyo Gas Co. Ltd., Tokyo (Japan); Zheng, W.; Williams, G.; Laronde, M.; Gianetto, J.A.; Shen, G.; Tyson, W.R. [Natural Resources Canada, Ottawa, ON (Canada). CANMET Materials Technology Lab; Oguchi, N.; Hosokawa, Y. [Tokyo Gas Co. Ltd., Tokyo (Japan). Pipeline Dept.

    2004-07-01

    Stress corrosion cracking (SCC) can occur in steel pipelines in near-neutral pH environments. The minimum stress levels required to initiate and grow SCC are not well understood. In this study, SCC tests were performed using a pipe section buried in a clay type of soil with a near-neutral pH value. The aim of the study was to aid in safety assessments of existing pipelines buried where large ground subsidences may occur. Pipe specimens with various sizes of fatigue pre-cracks were subjected to cyclic loading tests. The maximum hoop stress level was 105 per cent SMYS with an R-value of 0.5. Crack growth rates from fatigue crack tips were estimated at 10-15 mm/s. Fractographic and metallographic examinations were then conducted to determine the quasi-cleavage character of the transgranular SCC. A direct current potential drop (DCPD) was used to monitor the crack depth during the SCC test. The technique was based on the measurement of local-field electrical resistance of a crack site. The metallographic studies revealed the existence of micro-cracks associated with MnS inclusions in the highly strained field ahead of the initial crack tips. Results of the studies suggested that the high crack growth rates were caused by MnS inclusions. The loading rate was then calculated for each individual crack condition in order to correlate crack growth rates with loading rates. Non-linear finite element method analyses for semi-elliptical cracks based on stress-strain relationships obtained from tensile tests of an X60 steel specimen were then conducted to obtain J-integrals. Results of the study showed that there was a linear relationship between the crack growth rate and the loading rate. It was also concluded that cracking initiation was related to MnS inclusions. 9 refs., 3 tabs., 25 figs.

  10. 75 FR 57449 - Certain Seamless Carbon and Alloy Steel Standard, Line, and Pressure Pipe from the People's...

    Science.gov (United States)

    2010-09-21

    ... America LLC (``Salem Steel''), Toyota Tsusho America, Inc. (``TAI'') and MC Tubular Products, Inc. (``MC... of the investigation. On June 8, 2010, MC Tubular Products, Inc. (``MC Tubular'') and Toyota...

  11. Microstructure and Microsegregation of an Inconel 625 Weld Overlay Produced on Steel Pipes by the Cold Metal Transfer Technique

    Directory of Open Access Journals (Sweden)

    Rozmus-Górnikowska M.

    2014-10-01

    Full Text Available The aim of this work was to investigate the development of microstructure and variations in chemical composition in commercial Inconel 625 coatings on a ferritic-pearlitic steel overlaid by the CMT method.

  12. Pressure drop and stability of flow in Archimedean spiral tube with transverse corrugations

    Directory of Open Access Journals (Sweden)

    Đorđević Milan

    2016-01-01

    Full Text Available Isothermal pressure drop experiments were carried out for the steady Newtonian fluid flow in Archimedean spiral tube with transverse corrugations. Pressure drop correlations and stability criteria for distinguishing the flow regimes have been obtained in a continuous Reynolds number range from 150 to 15 000. The characterizing geometrical groups which take into account all the geometrical parameters of Archimedean spiral and corrugated pipe has been acquired. Before performing experiments over the Archimedean spiral, the corrugated straight pipe having high relative roughness e/d = 0.129 of approximately sinusoidal type was tested in order to obtain correlations for the Darcy friction factor. Insight into the magnitude of pressure loss in the proposed geometry of spiral solar receiver for different flow rates is important because of its effect upon the efficiency of the receiver. Although flow in spiral and corrugated geometries has the advantages of compactness and high heat transfer rates, the disadvantage of greater pressure drops makes hydrodynamic studies relevant. [Projekat Ministarstva nauke Republike Srbije, br. III 42006 i br. TR 33015

  13. Residual stress evaluation by X-Ray diffraction and hole-drilling in an API 5L X70 steel pipe bent by hot induction

    Energy Technology Data Exchange (ETDEWEB)

    Ceglias, Rodrigo Braga; Alves, Juciane Maria; Botelho, Ramon Alves; Baeta Junior, Eustaquio de Souza; Santos, Igor Cuzzuol dos; Moraes, Nicki Robbers Darciano Cajueiro de; Oliveira, Rebeca Vieira de; Diniz, Saulo Brinco; Brandao, Luiz Paulo, E-mail: brandao@ime.eb.br [Instituto Militar de Engenharia (IME), Rio de Janeiro, RJ (Brazil). Secao de Engenharia Mecanica e de Materiais

    2016-09-15

    The API 5L X70 steel is used in high-pressure gas transmission pipelines. Because of this, knowledge of presence of residual stress and their magnitude is important to assess the material integrity in service. For the pipeline manufacturing, tubes need to be curved which is often made using the hot induction bending process. This process can introduce different residual stress depending of tube position. For this research, in order to evaluate the residual stress, was used an API 5L X70 tube that was previously curved by hot induction process. Samples were taken from the extrados, intrados, neutral line and straight section of the curved tube. Residual stresses were studied by two conventional methods: X-Ray Diffraction (XRD) and Hole-Drilling, which are destructive and non-destructive methods, respectively, in order to assess their qualitative responses. Each of these methods presents particular methodologies in sample preparation and material analysis, but also they differ in factors such time consumption and cost of the analysis. The qualitative responses obtained by the two different methods were comparable and satisfactory and pointed out the existence of a compressive residual stress state in steel pipe. (author)

  14. Experimentation and numerical simulation of steel fibre reinforced concrete pipes; Experimentacion y simulacion numerica de tubos de hormigon con fibras

    Energy Technology Data Exchange (ETDEWEB)

    Fuente, A. de la; Domingues de Figueiredo, A.; Aguado, A.; Molins, C.; Chama Neto, P. J.

    2011-07-01

    The results concerning on an experimental and a numerical study related to SFRCP are presented. Eighteen pipes with an internal diameter of 600 mm and fibre dosages of 10, 20 and 40 kg/m3 were manufactured and tested. Some technological aspects were concluded. Likewise, a numerical parameterized model was implemented. With this model, the simulation of the resistant behaviour of SFRCP can be performed. In this sense, the results experimentally obtained were contrasted with those suggested by means MAP reaching very satisfactory correlations. Taking it into account, it could be said that the numerical model is a useful tool for the optimal design of the SFRCP fibre dosages, avoiding the need of the systematic employment of the test as an indirect design method. Consequently, the use of this model would reduce the overall cost of the pipes and would give fibres a boost as a solution for this structural typology. (Author) 27 refs.

  15. Flow induced pulsations generated in corrugated tubes

    NARCIS (Netherlands)

    Belfroid, S.P.C.; Swindell, R.; Tummers, R.

    2008-01-01

    Corrugated tubes can produce a tonal noise when used for gas transport, for instance in the case of flexible risers. The whistling sound is generated by shear layer instability due to the boundary layer separation at each corrugation. This whistling is examined by investigating the frequency, amplit

  16. Flow induced pulsations caused by corrugated tubes

    NARCIS (Netherlands)

    Shatto, D.P.; Belfroid, S.P.C.; Peters, M.C.A.M.

    2007-01-01

    Corrugated tubes can produce a tonal noise when used for gas transport, for instance in the case of flexible risers. The whistling sound is generated by shear layer instability due to the boundary layer separation at each corrugation. This whistling is examined by investigating the frequency, amplit

  17. Market challenges for steel

    Energy Technology Data Exchange (ETDEWEB)

    Lauprecht, W.E.; Bulla, W.

    1981-11-01

    Country-wise division of generation of high-alloyed steels, stainless steel and alloyed steel in Western Europe/the Western World. Review of expanding markets for alloyed steels on sectors like-oil field pipes, offshore structure gas- and oil transport in pipelines, coal conversion, nuclear energy, condenser tubes, solar energy, car industry, environmental protection and chemistry.

  18. Mechanics Property Analysis of X60 Steel Grade Spiral Steel Pipe%X60钢级螺旋焊接钢管力学性能分析

    Institute of Scientific and Technical Information of China (English)

    赵艺

    2013-01-01

    The experiments about tensile and impact toughness properties of the steel grade X60ф323.9mm × 7.1mm spiral submerged arc welded steel pipe in different stages:before coil uncoiling, after forming and hydrostatic pressure. After molding, the yield strength and strength of extension reduce about 4%. Through the hydraulic pressure, the yield strength and strength of extension increase and are higher than the original bending strength values.%对X60钢级ф323.9mm×7.1mm螺旋缝埋弧焊接钢管在板卷的开卷前、成型后及静水压等各个阶段的拉伸、冲击韧性性能进行了试验,通过试验发现成型后屈服强度、抗拉强度降低约4%左右,水压后屈服强度、抗拉强度均提高且高于原卷板强度值。

  19. Predicting the long term corrosion behaviour of pipe steels used at the CCS-site Ketzin, Germany in laboratory CO{sub 2}-saturated saline aquifer CCS-environment

    Energy Technology Data Exchange (ETDEWEB)

    Pfennig, A.; Linke, B. [HTW Univ. of Applied Sciences Berlin, Berlin (Germany); Kranzmann, A. [Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin (Germany)

    2010-07-01

    During Carbon Capture and Storage (CCS) CO{sub 2}-corrosion of pipe steels is a relevant safety issue when emission gases are compressed in deep geological layers. The reliability of the steels 42CrMo4 (1.7225), X46Cr13 (1.4034), X20Cr13 (1.4021) and X35CrMo17 (1.4122) is demonstrated in laboratory experiments under an equivalent corrosive aquifer environment as found at the geological onshore CCS-site at Ketzin, Germany at the in-situ temperature 60 C. (orig.)

  20. 安哥拉地区钢管桩停锤标准设计与实践%Design and Practice of Ceasing driving Standard for Steel Pipe Piles in Angola

    Institute of Scientific and Technical Information of China (English)

    于云山; 孟晓宁

    2014-01-01

    本文简要介绍安哥拉罗安达港钢管桩打桩停锤标准制定及其在施工过程中的实践应用,对该地区钢管桩设计施工过程中遇到的停锤标准问题进行初步探讨。%It is introduced briefly the establishment of ceasing driving standard for steel pipe piles in Luanda harbor of Angola and its application in the construction. And a preliminary research is carried out for the ceasing driving standard of steel pipe piles in the design and the construction.

  1. 钢管超声波自动探伤横向扫查系统的改造%Reform to Steel Pipe Automatic Ultrasonic Flaw Detection Transverse Scanning

    Institute of Scientific and Technical Information of China (English)

    汪超; 张兴权; 刘胜斌

    2014-01-01

    Through analysis on the configuration of steel pipe automatic ultrasonic flaw detection and defects type after pipe expansion in some steel pipe company,it got the reason of weld transverse defects occasionally found out during automatic ultrasonic inspection after pipe expansion,and put forward the reform measures of the existing automatic ultrasonic inspection transverse scanning. That is varying the arrangement of transverse probes and probe frame,adding monitor channel quantity. After reform,the testing system is with high reliability,simple operation,good stability,and the inspection personnel easy to master. The reforms decrease the risk of steel pipe missing detection,and enhance the productivity.%通过分析某钢管公司目前钢管超声波自动探伤设备的配置和钢管在扩径后发现的缺陷类型,找出了钢管扩径后超声波自动检测时偶尔发现焊缝横向缺陷的原因,提出了对现有钢管超声波自动探伤横向扫查系统的改造措施,即改变了横向探头及探头架的布置,增加了检测监视的通道数量。改造后的检测系统可靠性高,操作简便,稳定性好,探伤人员容易掌握。通过对该自动探伤横向扫查的改造,降低了钢管缺陷漏检的风险,提高了生产效率。

  2. Effect of Saturated CO2 on Corrosion Behavior of 13Cr Pipe Steel in High Chloride Environment%高氯环境中饱和CO2对13Cr油管钢腐蚀行为的影响

    Institute of Scientific and Technical Information of China (English)

    雷冰; 马元泰; 李瑛; 王福会; 常泽亮; 谢俊峰; 宋文文; 周理志

    2013-01-01

    The effect of saturated CO2 on corrosion behavior of 13Cr pipe steel in high concentration chloride environment was studied by EIS, polarization test, EN test and SEM. The results indicated that the corrosion rate and corrosion probability of 13Cr pipe steel were accelerated in high chloride environment with the presence of saturated CO2. The 13Cr pipe steel suffered from pitting corrosion in high chloride concentration environment, whilst, from uniform corrosion by the synergistic effect of Cl and CO2. The stability of the passive film of 13Cr pipe steel decreased in high concentration chloride environment with saturated CO2, which can be explained by the dehydroxylation of the outer part of the passive film by carbonic acid and the increase of ionic conductivity of the passive film in aqueous electrolytes.%采用电化学阻抗(EIS)、极化曲线、电化学噪声(EN)和扫描电子显微镜(SEM)研究了高氯环境中饱和CO2对13Cr油管钢腐蚀行为的影响.结果表明:饱和CO2加速材料的腐蚀,增大了腐蚀的发生频率,使材料的腐蚀由点蚀转变为均匀腐蚀.碳酸对钝化膜的去羟基化作用和增大钝化膜的导通率,是材料腐蚀行为变化的原因.

  3. Brownian transport in corrugated channels with inertia

    CERN Document Server

    Ghosh, P K; Marchesoni, F; Nori, F; Schmid, G; 10.1103/PhysRevE.86.021112

    2012-01-01

    The transport of suspended Brownian particles dc-driven along corrugated narrow channels is numerically investigated in the regime of finite damping. We show that inertial corrections cannot be neglected as long as the width of the channel bottlenecks is smaller than an appropriate particle diffusion length, which depends on the the channel corrugation and the drive intensity. Being such a diffusion length inversely proportional to the damping constant, transport through sufficiently narrow obstructions turns out to be always sensitive to the viscosity of the suspension fluid. The inertia corrections to the transport quantifiers, mobility and diffusivity, markedly differ for smoothly and sharply corrugated channels.

  4. Creep performance of welded pipe material made of 7CrMoVTiB10-10 (T/P24) steel

    Energy Technology Data Exchange (ETDEWEB)

    Rantala, Juhani; Auerkari, Pertti; Salonen, Jorma; Holmstroem, Stefan; Nevasmaa, Pekka [VTT Technical Research Centre of Finland, Espoo (Finland); Haekkilae, Juha [Foster Wheeler Energia, Varkaus (Finland)

    2010-07-01

    The creep strength of welded low-alloy ferritic steels is typically somewhat lower than that for parent metal, but this is generally due to an inherent weakness of the heat affected zone and accounted for in the common design codes. However, the parent material strength is much higher in certain modern low alloy steels such as 7CrMoVTiB10-10 (P24), and then it can be a significant challenge to develop weld metals (welding consumables) to match this strength. Acceptable weld performance has been previously demonstrated for thin-wall tubes where sufficient mixing with the base material can occur. The objective of this work was to achieve satisfactory properties for a thick-wall welded pipe by using an Nb-modified consumable to avoid weld metal weakening due to arc losses of Ti of a consumable composition approximately matching the base material. A considerable improvement was indeed noted in comparison with earlier experience using matching electrode composition. All short term test results for weld qualification showed acceptable properties, the cross-weld creep strength remain very close to the -20% band from the parent metal creep strength. However, creep testing at lowest stress levels approaching those expected in service resulted in weld metal failure. Although a clear improvement is evident from the previous generation of weld metals, there appears to be some further scope of development of the welding consumables, to improve the long term creep ductility of the welded joints particularly when applying production-like welding parameters. (orig.)

  5. Ultrasonic Phased Array Sound Field Mapping Through Large-Bore Coarse Grained Cast Austenitic Stainless Steel (CASS) Piping Materials

    Energy Technology Data Exchange (ETDEWEB)

    Cinson, Anthony D.; Crawford, Susan L.; Prowant, Matthew S.; Diaz, Aaron A.; Hathaway, John E.; Anderson, Michael T.

    2012-04-16

    A sound field beam mapping exercise was conducted to further understand the effects of coarse grained microstructures found in CASS materials on phased array ultrasonic wave propagation. Laboratory measurements were made on three CASS specimens with different microstructures; the specimens were polished and etched to reveal measurable grain sizes, shapes and orientations. Three longitudinal, phased array probes were fixed on a specimen's outside diameter with the sound field directed toward one end (face) of the pipe segment over a fixed range of angles. A point receiver was raster scanned over the surface of the specimen face generating a sound field image. A slice of CASS material was then removed from the specimen end and the beam mapping exercise repeated. The sound fields acquired were analyzed for spot size, coherency, and beam redirection. Analyses were conducted between the resulting sound fields and the microstructural characteristics of each specimen.

  6. Explosive welding of pipes

    Energy Technology Data Exchange (ETDEWEB)

    Drennov, O.; Burtseva, O.; Kitin, A. [Russian Federal Nuclear Center, Sarov (Russian Federation)

    2006-08-15

    Arrangement of pipelines for the transportation of oil and gas is a complicated problem. In this paper it is suggested to use the explosive welding method to weld pipes together. This method is rather new. This method can be advantageous (saving material and physical resources) comparing to its static analogs (electron-beam welding, argon-arc welding, plasma welding, gas welding, etc.), in particular, in hard-to-reach areas due to their geographic and climatic conditions. We suggest to perform explosive welding according to the following scheme: the ends of the 2 pipes are connected, the external surfaces are kept at a similar level. A cylindrical steel layer of diameter larger than the pipe diameter is set around the pipe joint and an explosive charge is placed on its external surface. The basic problem is the elimination of strains and reduction of pipe diameter in the area of the dynamic effect. The suggestion is to use water as filler: the volume of pipes in the area adjacent to the zone of explosive welding is totally filled with water. The principle of non-compressibility of liquid under quasi-dynamic loading is used. In one-dimensional gas dynamic and elastic-plastic calculations we determined non-deformed mass of water. Model experiments with pipes having radii R = 57 mm confirmed results of the calculations and the possibility in principle to weld pipes by explosion with use of water as filler.

  7. Aerodynamic sound of flow in corrugated tubes

    OpenAIRE

    2009-01-01

    Aerodynamic sound emitted by flow through a finite length duct with corrugated inner surface is experimentally investigated. As the mechanism of sound generating oscillation, so far popular 'cavity-tone' mechanism was definitely denied. The principal reason is: With corrugation of helical geometry, no characteristic sound came on, while a pair of a nozzle edge and a leading edge both of which are helical, with constant distance, made essentially as loud sound as a pair of normal edges. Other ...

  8. Offshore construction of batter pile of steel pipe rock- socketed pile%海上钢管嵌岩桩斜桩施工技术

    Institute of Scientific and Technical Information of China (English)

    梁昆; 张禹; 陈冬宇

    2014-01-01

    结合境外工程现场实际情况,将JK-8冲击钻钻头改装成圆筒形锤头进行钢管嵌岩斜桩的成孔,打破了嵌岩斜桩只能由顶置式回转钻机或立轴式回转钻机施工的固定模式。该工法适应性好,安全系数高,具有推广价值。%Combined with the practical situation of overseas projects, we changed the JK-8 impact drill bit into a tubular type impact hammer to drilling the steel pipe rock-socketed pile. This technology has broken the fixed pattern of batter pile con-struction using overhead type slewing drilling machine or vertical shafts slewing drilling machine only. The technology has good adaptability, high safety, and promotional value.

  9. Progress in the development of steels satisfying special demands of the markets

    Energy Technology Data Exchange (ETDEWEB)

    Bulla, W.; Lauprecht, W.E.; Diesburg, D.E.

    1981-11-16

    Large-diameter pipes, effect of seawater on steel, reduction of weight (automobile construction) and more stringent demands are discussed in the following chapters: Steels for oil- and gas-field pipes; large-diameter pipes; dual-phase steel; case-hardened steels for gear parts; creep-resistant components; high-alloy stainless steels for the chemical industry, environment and sea water.

  10. Hybrid modes in a square corrugated waveguide

    Energy Technology Data Exchange (ETDEWEB)

    Ohkubo, K.

    2001-06-01

    By using two scalar eigenfunctions, electric and magnetic fields in the rectangular (or square) corrugated waveguide are analyzed. In a rectangular corrugated waveguide, the boundary conditions on two corrugated and two smooth walls can be satisfied to excite the hybrid mode. In a highly oversized waveguide where the wavelength of dominant mode is close to that in vacuum, two smooth walls can be exchanged with the corrugated walls because the boundary condition at this walls is satisfied approximately. The replacement is possible due to almost no penetration of the electromagnetic fields into the gap of the replaced walls when the direction of main electric field is parallel to the gap of replaced walls. This characteristic enables us to rotate the polarization of the hybrid mode in the oversized square waveguide with all four corrugated walls and is applicable to the remote steering antenna for electron cyclotron heating in the ITER. For a beam injection larger than the critical angle in this antenna, excited higher modes are at a considerably different wavelength from that in vacuum and result in the dissatisfaction of boundary conditions due to millimeter-wave penetration into corrugation gaps in replaced walls. (author)

  11. Organizational diagnoses based on green management model: A case study of an Iranian pipe and equipment company in steel industry

    Directory of Open Access Journals (Sweden)

    Jalal Haghighat Monfared

    2012-04-01

    Full Text Available Green management plays an important role having better environment friendly industry and it is one of the prominent methods for reducing future issues surrounding our planet. The present study presents an empirical study of the implementation of green management for a real-world case study of steel industry. The study designs a questionnaire and distributes it among some experts from a steel industry. One of the main objectives of the survey is to investigate whether the firm is in good conditions in terms of green management perspective and the preliminary results of our survey indicate that the company received 340.6 points out 1000 points, which means the present conditions of the firm is quite unfavorable. There are many reasons describing the present conditions of the firm such as the lack of an integrated responsibility, weak management support and involvement, shortage of financial support, etc. The study also provides some guidelines for having better green management outcomes, which are setting better accounting procedures for evaluating the cost/benefit of projects and priding sufficient financial support for projects.

  12. Synthesis and application of hybrid polymer composites based on silver nanoparticles as corrosion protection for line pipe steel.

    Science.gov (United States)

    Atta, Ayman M; El-Mahdy, Gamal A; Al-Lohedan, Hamad A; Ezzat, Abdurrahman O

    2014-05-16

    A facile method was developed to synthesize in high yield dispersed silver nanoparticles (AgNPs) with small particle sizes of less than 10 nm. Silver nitrate was reduced to silver nanoparticles by p-chloroaniline in the presence of polyoxyethylene maleate 4-nonyl-2-propylene-phenol (NMA) as a stabilizer. The produced AgNPs were used to prepare hybrid polymer based on N-isopropylacrylamide (NIPAm), 2-acrylamido-2-methylpropane sulfonic acid (AMPS), N,N-methylenebisacrylamide (MBA) and potassium persulfate (KPS) using a semi-batch solution polymerization method. The prepared AgNPs and hybrid polymer were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) patterns and transmission electron microscopy (TEM). The corrosion inhibition activity of the AgNPs and hybrid polymer towards steel corrosion in the presence of hydrochloric acid has been investigated by polarization and electrochemical impedance spectroscopy (EIS) methods. Polarization measurements indicate that the AgNPs and hybrid polymer acts as a mixed type-inhibitor and the inhibition efficiency increases with inhibitor concentration. The results of potentiodynamic polarization and EIS measurements clearly showed that the inhibition mechanism involves blocking of the steel surface by inhibitor molecules via adsorption.

  13. Engineering Example Analysis of Limit Sliding Resistance of Steel Pipe Micro - pile%钢管微型桩极限抗滑力的工程实例分析

    Institute of Scientific and Technical Information of China (English)

    马周全

    2012-01-01

    Research purposes; Micro - pile construction has been widely used in the reinforcement in the mountains slope (landslide) with the feature of simple, rapid construction, layout flexibility and strong skid resistance. Based on the failure examples of steel pipe micro - pile reinforcement slope, using finite element method to research the limit sliding resistance of steel pipe micro — pile through back analysis. Research conclusions: This study showed that, for the steel pipe micro - pile that using pile - cap - beam combined structure, the landslide - thrust distribution back of the pile is big in the end and small in the middle performance " U" type distribution form; Soil resistance before the pile is big top and small bottom performance inverted triangular distribution. Limit sliding resistance of steel pipe micro - pile composite structures (four row of steel pipe pile + contact beam) is 596 kN, single steel pipe micro — pile average limit sliding resistance for 149 kN. In practical projects, these engineering measures can be used to improve the anti - sliding ability of steel pipe micro - pile such as modify between pile soil, setting support structure before pile, optimize structure distribution form, and so on.%研究目的:微型桩具有施工简便、施工快速、布置灵活、抗滑能力较强的特点,在山区边坡(滑坡)加固中得到了广泛的应用.基于钢管微型桩加固边坡的破坏实例,采用有限元方法进行反分析,对钢管微型桩的极限抗滑力进行研究.研究结论:对于采用了桩顶连系梁的钢管微型桩组合结构而言,桩后滑坡推力呈上部大、中间小、下部大的“U”型分布形式;桩前土体抗力呈上部大下部小的倒三角形分布.钢管微型桩组合结构(四排钢管桩+连系梁)的极限抗滑力为596 kN,单根钢管微型桩的平均极限抗滑力为149 kN.在实际工程中,可采用改良桩间土、桩前设置支撑结构、优化结构布置形式等工

  14. 海洋腐蚀环境及船用不锈钢管选材备考(下)%Review on Stainless Steel Pipe Selecting Materials Used in Ocean Corrosion Environment and Ship(Ⅱ)

    Institute of Scientific and Technical Information of China (English)

    何德孚; 王晶滢

    2016-01-01

    The marine corrosion environment was analyzed from the composition of water and sea water corrosion factors. According to the standard of marine stainless steel pipe,it analyzed and assessed the material selection of stainless steel pipe used for ocean petroleum and petrochemical for different use and environment,and analyzed the application case of stainless steel pipe used for marine at home and abroad,finally,it discussed the development tendency of corrosion resistance alloy. The research results showed that Cl- pitting corrosion and crevice corrosion are the root cause of the marine environment corrosion hazard,304L steel is not with the ocean corrosion resistance performance,316L steel can only be used in water after deoxidization under a certain environment and temperature;Application of stainless steel pipe in natural seawater should adopt cathodic protection measures,it should consider the composition of internal oil and gas medium and corrosion characteristics in materials selecting for all kinds of pipeline in oil recovery platform production operation ship.%从海水的成分和海水腐蚀因素对海洋腐蚀环境进行了分析,根据海洋船舶不锈钢管材的标准,分析并评估了海洋石油石化用不锈钢管在不同用途和环境下的选材思路,列举并分析了国内外海洋用不锈钢管的应用案例,最后对船舶用耐蚀合金的发展趋势进行了讨论。研究结果表明, Cl-孔蚀和缝隙腐蚀是海洋环境腐蚀危害的根本原因,304L钢不具备耐海洋腐蚀的性能,316L钢只能在一定环境和温度下在脱氧后的海水中使用;在自然海水中应用不锈钢管必须采用阴极保护措施;采油平台等油气生产作业船舶中各类管道的选材应先考虑其内部的油气介质成分及其腐蚀特征。

  15. Review on Stainless Steel Pipe Selecting Materials Used in Ocean Corrosion Environment and Ship(Ⅰ)%海洋腐蚀环境及船用不锈钢管选材备考(上)

    Institute of Scientific and Technical Information of China (English)

    何德孚; 王晶滢

    2016-01-01

    从海水的成分和海水腐蚀因素对海洋腐蚀环境进行了分析,根据海洋船舶不锈钢管材标准,分析并评估了海洋石油石化用不锈钢管在不同用途和环境下的选材思路,列举并分析了国内外海洋用不锈钢管的应用案例,最后对船舶用耐蚀合金的发展趋势进行了讨论.研究结果表明,Cl-孔蚀和缝隙腐蚀是海洋环境腐蚀危害的根本原因,304L钢不具备耐海洋腐蚀的性能,316L钢只能在一定环境和温度下在脱氧后的海水中使用;在自然海水中应用不锈钢管必须采用阴极保护措施;采油平台等油气生产作业船舶中各类管道的选材应先考虑其内部的油气介质成分及其腐蚀特征.%The marine corrosion environment was analyzed from the composition of water and sea water corrosion factors. According to the standard of marine stainless steel pipe, it analyzed and assessed the material selection of stainless steel pipe used for ocean petroleum and petrochemical for different use and environment, and analyzed the application case of stainless steel pipe used for marine at home and abroad, finally, it discussed the development tendency of corrosion resistance alloy. The research results showed that Cl- pitting corrosion and crevice corrosion are the root cause of the marine environment corrosion hazard, 304L steel is not with the ocean corrosion resistance performance, 316L steel can only be used in water after deoxidization under a certain environment and temperature; Application of stainless steel pipe in natural seawater should adopt cathodic protection measures, it should consider the composition of internal oil and gas medium and corrosion characteristics in materials selecting for all kinds of pipeline in oil recovery platform production operation ship.

  16. 46 CFR 98.25-55 - Cargo piping.

    Science.gov (United States)

    2010-10-01

    ... 46 Shipping 4 2010-10-01 2010-10-01 false Cargo piping. 98.25-55 Section 98.25-55 Shipping COAST... Cargo piping. (a) Piping shall be of seamless steel meeting the requirements of § 56.60-1 of subchapter F (Marine Engineering) of this chapter. The piping shall be of not less than Schedule 40...

  17. Assessment of the integrity of welded pipes

    OpenAIRE

    Šarkoćević, Živče; Arsić, Miodrag; Sedmak, Aleksandar; MEĐO, Bojan; Mišić, Milan; id_orcid 0000-0003-0550-1851

    2014-01-01

    The subject of the paper is analysis of the integrity of welded pipes made of API J55 steel by high frequency contact welding (HF). Experimental research on the mechanical properties of the base material was conducted on pipes withdrawn from exploatation after 70 000 hours at service. Defect influence of the surface crack on the integrity of pipes was tested using hydrostatic pressure of pipes with axial surface crack in the base material. Fracture behaviour was tested using modified compact ...

  18. Effects of thermal aging on fracture toughness and Charpy-impact strength of stainless steel pipe welds

    Energy Technology Data Exchange (ETDEWEB)

    Gavenda, D.J.; Michaud, W.F.; Galvin, T.M.; Burke, W.F.; Chopra, O.K. [Argonne National Lab., IL (United States)

    1996-05-01

    Degradation of fracture toughness, tensile, and Charpy-impact properties of Type 304 and 304/308 SS pipe welds due to thermal aging was studied at room temperature and 290 C. Thermal aging of SS welds results in moderate decreases in charpy-impact strength and fracture toughness. Upper-shelf energy decreased by 50-80 J/cm{sup 2}. Decrease in fracture toughness J-R curve or J{sub IC} is relatively small. Thermal aging had no or little effect on tensile strength of the welds. Fracture properties of SS welds are controlled by the distribution and morphology of second-phase particles. Failure occurs by formation and growth of microvoids near hard inclusions; such processes are relatively insensitive to thermal aging. The ferrite phase has little or no effect on fracture properties of the welds. Differences in fracture resistance of the welds arise from differences in the density and size of inclusions. Mechanical-property data from the present study are consistent with results from other investigations. The existing data have been used to establish minimum expected fracture properties for SS welds.

  19. X60管线钢在盐碱性土壤中的腐蚀行为与机理%Corrosion behaviors and mechanism of X60 pipe steel in saline and alkali soil

    Institute of Scientific and Technical Information of China (English)

    黄亮亮; 孟惠民; 黄晓林; 陈建民; 胡景克; 王育青

    2013-01-01

    基于土壤性质检测,室内模拟实验,实际管道防腐层绝缘性测试、杂散电流测试,爆管处腐蚀形貌比较,管道埋地实际状况分析,研究了X60管线钢在黄河下游冲击平原土壤中的腐蚀行为.结果表明:黄河下游冲击平原土壤具有强碱、高含盐(主要为高NaCl)、高腐蚀性质;X60管线钢均匀腐蚀轻微,但会发生严重的坑腐蚀,腐蚀过程是:X60管线钢在水含量高甚至饱和的高含NaCl土壤中发生Fe氧化腐蚀反应,钢表面先形成含水FeOOH内腐蚀产物膜,腐蚀产物膜虽对基体具有一定的保护作用,但因Cl-渗入内腐蚀产物膜产生局部破坏,导致严重的坑腐蚀,并可能发展为爆管破坏.%In this paper, the corrosion behavior of X60 pipe steel is studied in the soil of alluvial plain downstream of the Yellow River based on soil property test, indoor simulation experiment, actual pipeline coating insulation test, stray current test and comparison of corrosion morphology at pipe bursting location, and actual buried situation of pipeline. Results show that the soil of alluvial plain downstream of the Yellow River is strong basic, high salt content (mainly including NaCl) and highly corrosive soil. For X60 pipe steel, uniform corrosion is slight but pit corrosion is serious, the corrosion process is that X60 pipe steel undergoes iron oxidation reaction in the soil with high water content even saturated water content and high NaCl content, an FeOOH inner corrosion product film containing water will firstly form on the steel surface and have certain protective functions against base material, but local damage may occur for inner corrosion product film due to Cl-penetration, and thus resulting in serious pit corrosion, which may develop into pipe bursting damage.

  20. A Computational approach in optimizing process parameters of GTAW for SA 106 Grade B steel pipes using Response surface methodology

    Science.gov (United States)

    Sumesh, A.; Sai Ramnadh, L. V.; Manish, P.; Harnath, V.; Lakshman, V.

    2016-09-01

    Welding is one of the most common metal joining techniques used in industry for decades. As in the global manufacturing scenario the products should be more cost effective. Therefore the selection of right process with optimal parameters will help the industry in minimizing their cost of production. SA 106 Grade B steel has a wide application in Automobile chassis structure, Boiler tubes and pressure vessels industries. Employing central composite design the process parameters for Gas Tungsten Arc Welding was optimized. The input parameters chosen were weld current, peak current and frequency. The joint tensile strength was the response considered in this study. Analysis of variance was performed to determine the statistical significance of the parameters and a Regression analysis was performed to determine the effect of input parameters over the response. From the experiment the maximum tensile strength obtained was 95 KN reported for a weld current of 95 Amp, frequency of 50 Hz and peak current of 100 Amp. With an aim of maximizing the joint strength using Response optimizer a target value of 100 KN is selected and regression models were optimized. The output results are achievable with a Weld current of 62.6148 Amp, Frequency of 23.1821 Hz, and Peak current of 65.9104 Amp. Using Die penetration test the weld joints were also classified in to 2 categories as good weld and weld with defect. This will also help in getting a defect free joint when welding is performed using GTAW process.

  1. PPOOLEX experiments with two parallel blowdown pipes

    Energy Technology Data Exchange (ETDEWEB)

    Laine, J.; Puustinen, M.; Raesaenen, A. (Lappeenranta Univ. of Technology, Nuclear Safety Research Unit (Finland))

    2011-01-15

    This report summarizes the results of the experiments with two transparent blowdown pipes carried out with the scaled down PPOOLEX test facility designed and constructed at Lappeenranta University of Technology. Steam was blown into the dry well compartment and from there through either one or two vertical transparent blowdown pipes to the condensation pool. Five experiments with one pipe and six with two parallel pipes were carried out. The main purpose of the experiments was to study loads caused by chugging (rapid condensation) while steam is discharged into the condensation pool filled with sub-cooled water. The PPOOLEX test facility is a closed stainless steel vessel divided into two compartments, dry well and wet well. In the experiments the initial temperature of the condensation pool water varied from 12 deg. C to 55 deg. C, the steam flow rate from 40 g/s to 1 300 g/s and the temperature of incoming steam from 120 deg. C to 185 deg. C. In the experiments with only one transparent blowdown pipe chugging phenomenon didn't occur as intensified as in the preceding experiments carried out with a DN200 stainless steel pipe. With the steel blowdown pipe even 10 times higher pressure pulses were registered inside the pipe. Meanwhile, loads registered in the pool didn't indicate significant differences between the steel and polycarbonate pipe experiments. In the experiments with two transparent blowdown pipes, the steamwater interface moved almost synchronously up and down inside both pipes. Chugging was stronger than in the one pipe experiments and even two times higher loads were measured inside the pipes. The loads at the blowdown pipe outlet were approximately the same as in the one pipe cases. Other registered loads around the pool were about 50-100 % higher than with one pipe. The experiments with two parallel blowdown pipes gave contradictory results compared to the earlier studies dealing with chugging loads in case of multiple pipes. Contributing

  2. STUDY OF CARRYING CAPACITY OF A CORRUGATED METAL CONSTRUCTION BY CRITERION OF YIELD HINGE DEVELOPMENT

    Directory of Open Access Journals (Sweden)

    Y. Y. Luchko

    2015-10-01

    Full Text Available Purpose. This research is aimed to: 1 calculation of equivalent forces caused by rolling stock in winter and summer seasons at different parameters of the irregularities of railway track; 2 research of bearing capacity of corrugated metal constructions (CMC in terms of development of plastic hinge in the top of the metal pipe due to irreversible residual deformation of the vertical and horizontal diameters of the pipe. Methodology. The calculation of equivalent forces is carried out according to the method of calculating the railway track on strength and stability. Further a mathematical algorithm was developed in the software environment of Mathcad 14, with which the calculations were made about the formation of a plastic hinge at the top of the pipe for different values of the irregularities of the railway track and the degree of compaction of soil backfill. In these studies, the calculations were carried out at the design value of the compaction degree of soil backfill and magnitude of dynamic loading on railway rolling stock. Findings. Analysis of multivariate calculations of testing the condition of occurrence of plastic hinge at the top of the pipe arch has revealed that the first plastic hinge, which occurs in the set of CMC is revealed only when there is a simultaneous unfavorable influence of two factors (causes. These are the factors: the assumption of the development of the track irregularities out of the allowable values without the implementation of measures to eliminate or limit the speed of trains (the first cause; reduction of compaction of soil backfill below the 90 % (the second cause. In case of absence of one of the causes the origin of the plastic hinge will not happen. Originality. It was the first time, when the bearing capacity of corrugated metal construction with large diameter (more than 6 m with account of factors complex: the degree of compaction of soil backfill, the magnitude of the dynamic loads from rolling stock

  3. Health Safety of Main Water Pipe Materials Supplied in China Market

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    To assess the health safety of copper, steel and plastic water pipes by field water quality investigations.Methods Four consumers were randomly selected for each type of water pipes. Two consumers of every type of the water pipes had used the water pipes for more than 1 year and the other 2 consumers had used the water pipes for less than 3 months.The terminal volume of tap water in copper and steel water pipes should be not less than 0.1 liter, whereas that in plastic water pipes should be not less than 1 liter. Results The mean values of the experimental results in the second field water quality investigation of the copper and steel water pipes met the Sanitary Standards for Drinking Water Quality. The items of water sample of the plastic water pipes met the requirements of the Sanitary Standards for Drinking Water Quality. Conclusion Copper, steel, and plastic pipes can be used as drinking water pipes.

  4. Behaviour of steel pipe exposed to fouling by heavy oil during core-annular flow; Comportamento de tubo de aco exposto a sujeira de oleo pesado durante escoamento nucleo-anular

    Energy Technology Data Exchange (ETDEWEB)

    Barbosa, Adriana; Bannwart, Antonio C. [Universidade Estadual de Campinas, SP (Brazil). Faculdade de Engenharia Mecanica. Dept. de Engenharia de Petroleo

    2004-07-01

    The use of water-assisted technologies such as core-annular flow to the pipelines of viscous oils has been proposed as an attractive alternative for production and transportation of heavy crudes in both onshore and offshore scenarios. Usually, core-annular flow can be created by injecting a relatively small water flow rate laterally in the pipe, so as to form a thin water annulus surrounding the viscous oil, which is pumped through the center. The reduction in friction losses obtained thanks to lubrication by water is significant, since the pressure drop in a steady state core flow becomes comparable to water flow only. For a complete assessment of core flow technology, however, unwanted effects associated with possible oil adhesion onto the pipe wall should be investigated, since these may cause severe fouling of the wall and pressure drop increase. It has been observed that oil adhesion on metallic surfaces may occur for certain types of crude and oilphilic pipe materials. In this work we present results of pressure drop monitoring during 35 hour-operation of a heavy oil-water core annular flow in a 26.08 mm. i.d. horizontal steel pipe. The oil used is described in terms of its main components and the results of static wet ability tests are also presented for comparison (author)

  5. Development of P110 Grade Plain-end Pipe Steel for Oil Casing%P110钢级光管产品研制开发*

    Institute of Scientific and Technical Information of China (English)

    王金海; 尚明

    2013-01-01

      Using 25Mn2V steel and taking the process of BOF→LF+VD→Continuous Casting→Rolling→Heat treatment, designing and optimizing the chemical composition and heat treatment process to control carbon content between 0.23%and 0.26%, and using high quality graphite lubricant andΦ180 mm round billet in hot rolling procedure, P110 grade casing pipes ofΦ177.8 mm×10.36 mm specification were developed and produced. The yield strength of the product is 903.8 MPa, the property qualification rate is 100%, UT inspection meets the needs of L2 level and the physical dimensions and external quality are fine. The product qualities meet the requirements of API 5CT standard and customers.%  采用25Mn2V钢、BOF→LF+VD→连铸→轧制→调质处理工艺,通过设计优化钢的化学成分及热处理工艺等,控制C含量在0.23%~0.26%,热轧使用高质量石墨润滑剂、Φ180 mm圆管坯,开发生产了Φ177.8 mm×10.36 mm规格P110钢级套管,产品屈服强度903.8 MPa,性能合格率100%,超声波探伤L2合格,几何尺寸、外表质量良好,产品质量满足API 5CT规范及用户要求。

  6. Mechanical properties degradation in a Cr-Mo low-alloy steel pipe after prolonged use for gas transport in a power plant station

    Directory of Open Access Journals (Sweden)

    Mihai, D.

    2002-12-01

    Full Text Available Some prolonged exposure effects at the high temperatures and pressures characteristic to the steam transport in power station, have been revealed in a 12HMF GOST (13CrMo44 DIN Cr-Mo low alloy steel pipes, at both macro and microstructural level, by mechanical tests and optical microscopy. After 128625 functioning hours, a marked mechanical degradation was noticed by the values of tensile strength, hardness and toughness that decreased with 14-16 %, 45-48 % and 47-59 %, respectively. This lose of mechanical properties was correlated on one hand to the coalescence of ferrite grains and pearlite islets and on the other hand to a decrease in the anisotropy of the grains morphology.

    Se han determinado algunos efectos de la exposición prolongada a temperaturas y presiones altas, características del transporte del vapor en una central térmica, en las conducciones de acero 12HMF GOST (13CrMo44 DIN Cr-Mo de baja aleación, a nivel macro y microestructural a través de ensayos mecánicos y microscopia óptica. Tras 128.625 h de servicio, se ha notado una notable degradación mecánica en los valores de la resistencia a la rotura, de la dureza y de la resilencia, que han disminuido entre un 14-16 %, un 45-48 % y un 47-59 %, respectivamente. La degradación mecánica se correlacionó, por una parte, con la coalescencia de los granos de ferrita y de las islas de perlita y, por otra, con el decrecimiento en la anisotropía de la morfología de los granos.

  7. Chaotic Motion of Corrugated Circular Plates

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Large deflection theory of thin anisotropic circular plates was used to analyze the bifurcation behavior and chaotic phenomena of a corrugated thin circular plate with combined transverse periodic excitation and an in-plane static boundary load. The nonlinear dynamic equation for the corrugated plate was derived by employing Galerkin's technique. The critical conditions for occurrence of the homoclinic and subharmonic bifurcations as well as chaos were studied theoretically using the Melnikov function method. The chaotic motion was also simulated numerically using Maple, with the Poincaré map and phase curve used to evaluate when chaotic motion appears. The results indicate some chaotic motion in the corrugated plate. The method is directly applicable to chaotic analysis of an isotropic circular plate.

  8. Designing and constructing corrugated glass facades

    Directory of Open Access Journals (Sweden)

    Rob Nijsse

    2015-05-01

    Full Text Available Flat glass panels are in use since the time of the Roman Empire. In the ruins of the city of Pompeii, destroyed by the Vulcan Vesuvius in 79 DC, a glass panel in a bronze frame of 300 × 600 mm was found. In this article we describe a mayor improvement in the structural behaviour of glass panels by making the glass curved, or more accurately, corrugated. Both the in- and out-plane loading meet far more resistance against deformation, and the corrugated glass panels have a largely increased bearing capacity with the same thickness of glass the flat panel has. Also architecturally the appearance of a corrugated glass panel in facades is far more appealing.

  9. Design of Corrugated Plates for Optimal Fundamental Frequency

    Directory of Open Access Journals (Sweden)

    Nabeel Alshabatat

    2016-01-01

    Full Text Available This paper investigates shifting the fundamental frequency of plate structures by corrugation. Creating corrugations significantly improves the flexural rigidities of plate and hence increases its natural frequencies. Two types of corrugations are investigated: sinusoidal and trapezoidal corrugations. The finite element method (FEM is used to model the corrugated plates and extract the natural frequencies and mode shapes. The effects of corrugation geometrical parameters on simply supported plate fundamental frequency are studied. To reduce the computation time, the corrugated plates are modeled as orthotropic flat plates with equivalent rigidities. To demonstrate the validity of modeling the corrugated plates as orthotropic flat plates in studying the free vibration characteristics, a comparison between the results of finite element model and equivalent orthotropic models is made. A correspondence between the results of orthotropic models and the FE models is observed. The optimal designs of sinusoidal and trapezoidal corrugated plates are obtained based on a genetic algorithm. The optimization results show that plate corrugations can efficiently maximize plate fundamental frequency. It is found that the trapezoidal corrugation can more efficiently enhance the fundamental frequency of simply supported plate than the sinusoidal corrugation.

  10. Research on 16Mo3 (16M Steel Pipes Overlaid with Haynes Nicro625 Alloy Using MIG (131 Method / Badania Rur Ze Stali 16Mo3 (16M Napawanych Metodą MIG (131 Stopem Haynes Nicro625

    Directory of Open Access Journals (Sweden)

    Golański G.

    2015-12-01

    Full Text Available The paper presents the research on the microstructure and mechanical properties of a pipe made of 16Mo3 steel, overlaid with superalloy based on Haynes NiCro625 nickel. The overlay weld was overlaid using the MIG (131 method. The performed macro - and microscopic tests have shown the correct structure of the overlay weld without any welding unconformities. The examined overlay weld was characterized by a dendritic structure of the primary crystals accumulating towards the heat removal. It has been proved that the content of iron in the surface zone does not exceed 7%, and the steel-superalloy joint shows the highest properties in comparison with the materials joined.

  11. Effect of Corrugation Angle on Heat Transfer Studies of Viscous Fluids in Corrugated Plate Heat Exchangers

    Directory of Open Access Journals (Sweden)

    B Sreedhara Rao

    2015-04-01

    Full Text Available In the present investigation heat transfer studies are conducted in corrugated plate heat exchangers (PHEs having three different corrugation angles of 300, 400 and 500. The plate heat exchangers have a length of 30 cm and a width of 10 cm with a spacing of 5 mm. Water and 20% glycerol solution are taken as test fluids and hot fluid is considered as heating medium. The wall temperatures are measured along the length of exchanger at seven different locations by means of thermocouples. The inlet and outlet temperatures of test fluid and hot fluid are measured by means of four more thermocouples. The experiments are conducted at a flowrate ranging from 0.5 lpm to 6 lpm with the test fluid. Film heat transfer coefficient and Nusselt number are determined from the experimental data. These values are compared with different corrugation angles. The effects of corrugation angles on heat transfer rates are discussed.

  12. 稳市场控产量调结构保盈利促进钢管行业健康平稳发展%Stabilizing Market, Controlling Output, Adjusting Structure and Maintaining Profit to Promote Healthy and Stable Development for Steel Pipe Industry

    Institute of Scientific and Technical Information of China (English)

    严泽生

    2012-01-01

    In this article, it reviewed the running situation, import & export status of China steel pipe industry, as well as steel pipe market price in 2011; analyzed the operation characteristics of China steel pipe industry; pointed out main problems which exist in steel pipe industry, and predicted the coming stage market. Steel pipe industry underwent development slump period caused from several aspects, such as global economy development continued depression, Europe and America debt crisis, stable increasing speed of China domestic economy, as well as market demand shrinkage etc. Facing serious situation, every enterprise actively adopts various measures, eliminates unfavorable effect to realize industry development goal and boost the healthy and stable development in steel pipe industry.%回顾了2011年我国钢管行业运行情况、进出口态势以及钢管市场的价格,分析了2011年我国钢管行业运行特点,指出了我国钢管行业目前存在的主要问题,并对后期市场进行了预测.报告指出:受世界经济持续低迷,欧美债务危机以及国内经济增速维稳,市场需求萎缩等因素的影响,钢管行业经历了发展低速期.在严峻的形势面前,各企业积极采取各种措施,努力化解不利影响,为实现行业发展目标,促进钢管行业健康平稳发展做出了积极努力.

  13. Optimizing Casimir torque between corrugated metallic plates

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, Robson B. [Universidade Federal Fluminense, Niteroi, RJ (Brazil); Maia Neto, Paulo A. [Instituto de Fisica, Universidade Federal do Rio de Janeiro, RJ (Brazil)

    2013-07-01

    Full text: The Casimir effect plays a major role in micro- and nano-electromechanical systems (MEMS and NEMS). Besides the normal Casimir force between metallic or dielectric plates, the observation of the lateral Casimir force between corrugated plates opens novel possibilities of micro-mechanical control. The lateral force results from breaking the translational symmetry along directions parallel to the plates by imprinting periodic corrugations on both metallic plates. As the rotational symmetry is broken by this geometry, a Casimir torque arises when the corrugations are not aligned. We calculate the Casimir torque between two parallel metallic plates with surface profiles in the form of 'fans' with arbitrary relative spatial orientation. As compared to the case of anisotropic dielectric plates, the torque per unit area is increased by up to three orders of magnitude for a given separation distance. The experiment proposed here can be performed with torsion pendulum techniques for separation distances as large as 1 μm. From the point of view of fundamental physics, this torque makes possible a precise experimental investigation of the non-trivial geometry dependence of the Casimir effect. We follow the scattering approach and calculate the Casimir energy up to second order in the corrugation amplitudes, taking into account nonspecular reflections, polarization mixing and the finite conductivity of the metals. We investigate the experimental conditions that optimize the effect. (author)

  14. Coupled Transport Phenomena in Corrugated Photocatalytic Reactors

    Institute of Scientific and Technical Information of China (English)

    Adam A. Donaldson; ZHANG Zisheng

    2011-01-01

    Corrugated reactors are known for their use in applications requiring UV-exposure, whereby media flowing within the corrugated channel react with a photo-active catalyst impregnated on the surface (i.e. TiO2). The performance in these systems is dependent on catalyst properties and reactivity for a given light source, in conjunc-tion with the coupled transport of reactants within the media and photons falling incident to the catalyst surface. Experimental and computational analyses of local mass transfer and radiation pattems for a broad range of corrugation angles, depths, and non-idealities introduced during manufacture (i.e. fold curvature) are thus integrated to the design and optimization of these systems. This work explores techniques for determining incident energy distribu-tions on the surface of corrugated reactor geometries with non-ideal cross-sectional profiles, and the local and overall mass transfer rates obtained using computational fluid dynamics and experimental analysis. By examining the reaction kinetics for the photo-degradation of 4-chlorophenol over a TiO2 catalyst, the effects of surface area, energy incidence with photon recapture, and local mass transfer on overall reactor performance are presented to highlight ootimization concerns for these tvoes of reactors.

  15. Aeronautical tubes and pipes

    Science.gov (United States)

    Beauclair, N.

    1984-12-01

    The main and subcomponent French suppliers of aircraft tubes and pipes are discussed, and the state of the industry is analyzed. Quality control is essential for tubes with regard to their i.d. and metallurgical compositions. French regulations do not allow welded seam tubes in hydraulic circuits unless no other form is available, and then rustproofed steel must be installed. The actual low level of orders for any run of tubes dictates that the product is only one of several among the manufacturers' line. Automation, both in NDT and quality control, assures that the tubes meet specifications. A total of 10 French companies participate in the industry, serving both civil and military needs, with some companies specializing only in titanium, steel, or aluminum materials. Concerns wishing to enter the market must upgrade their equipment to meet the higher aeronautical specifications and be prepared to furnish tubes and pipes that serve both functional and structural purposes simultaneously. Additionally, pipe-bending machines must also perform to tight specifications. Pipes can range from 0.2 mm exterior diameter to 40 mm, with wall thicknesses from 0.02 mm to 3 mm. A chart containing a list of manufacturers and their respective specifications and characteristics is presented, and a downtrend in production with reduction of personnel is noted.

  16. 利用相控阵技术对于厚壁钢管的探伤方法研究%Research of thick-walled steel pipe testing method using phased array technology

    Institute of Scientific and Technical Information of China (English)

    陈树

    2016-01-01

    For the non-destructive testing of thick-walled steel pipe, in general use ray testing or ultrasonic testing. But ray testing or A ultrasonic testing spent more time and low efifciency. Advanced ultrasonic phased array testing technology can improve efifciency. The feasibility and reliability of the thick-walled steel pipe testing was veriifed by drawing a DAC curve of test block comparison method.%对于厚壁钢管的无损探伤,一般采取射线探伤或超声波探伤。但射线探伤和A超探伤所耗费的时间比较长,效率不高。我们可以通过研究超声波中较为先进的相控阵探伤技术来提高效率。对此我们通过试块对比法绘制DAC曲线来验证相控阵技术在钢制厚壁圆管的探伤中的可行性和可靠性。

  17. Effect of Mixture Composition Design on High-performance Steel Pipe Concrete%混合料组成设计对高性能钢管混凝土的影响

    Institute of Scientific and Technical Information of China (English)

    卢海; 钱可毅; 周登文; 李东莲

    2013-01-01

    High-performance concrete is a kind of concrete which uses conventional materials and processes of production, have every required mechanical properties of concrete structure, high durability, high resistance and high dimensional stability. It can be used to steel pipe arch bridge to fill steel pipe. This paper explores the high-performance concrete material composition by using "uniformly dispersed, neat comparable" features of the orthogonal design.%  高性能混凝土采用常规材料和工艺生产,具有混凝土结构所要求各项力学性能,具有高耐久性、高工作性和高体积稳定性的混凝土,可用钢管拱桥填充钢管。本文利用正交设计的“均匀分散,齐整可比”对高性能混凝土材料组成进行探索。

  18. Hardness and microstructural characterization of API 5L X70 steel pipes welded by HF/ERW process; Caracterizacao microestrutural e de dureza em tubos de aco API 5L X70 soldados pelo processo HF/ERW

    Energy Technology Data Exchange (ETDEWEB)

    Calcada, Mauricio Vieira; Voorwald, Herman Jacobus Cornelis; Nascimento, Marcelino Pereira do [UNESP, Guaratingueta, SP (Brazil). Faculdade de Engenharia

    2010-07-01

    The materials that stand in the manufacture of steel pipes are called API, that should have, high mechanical resistance, high corrosion resistance, high fatigue resistance, good weldability, and other properties. Thus, the purpose of this project was to evaluate the microstructure and hardness of welded joints by the HF/ERW process of API 5L X70 steel pipes. The microstructural analysis was performed using a surface finish with grit sizes from 220 to 25 {mu}m e polishing with diamond paste from 9 {mu}m to 0.05 {mu}m; the revelation was made with 3% Nital attack. The Vickers hardness was performed across the welded joint by 33 points to indentation. The results were: 80.5 {+-} 3.4% of ferrite and 19.5 {+-} 3.4% of perlite for microanalysis. As for hardness, the values were: 215.69 HV10 for weld line, 218.65 HV10 for ZTA and 218.95 HV10 for base metal. (author)

  19. ABSTRACTS WELDEL PIPE AND TUBE

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    ABSTRACTS WELDEL PIPE AND TUBE Vol.24 No.3 May.2001 Huang Jingan(1) Strengthen, Intercourse, Coordination and Promote the Development Together Liang Aiyu(11) The Production and the Development of the Water supply pipe for City Construction From the aspects of the quality, appearance, environment protection, economic analysis etc., This article evaluates the galvanized pipe, plastic steel complex pipe, plastic aluminum pipe, stainless pipe for city water supply. In accordance with the requirements of the city construction programming and development, it is considered that the plastic aluminum pipe and plastic steel pipe instead of galvanization pipe is the trend of the development. The author also gives some constructive proposals for reference. Subject Terms:galvanized pipe complex pipe stainless pipe city water supply evaluation Zhao Rongbin,Li Guangjun(14) The TIG welding of Protected Tantalum-pipe for sheathed thermocouples used in corrosive environment The protected Tantalum-pipe welding of sheathed therocouples was investigated by TIG. The welding process and its key parameters were introduced. Welding quality influenced by processing was discussed. Subject Terms:welding protected Tantalum-pipe corrosion He Defu et al(18) Design and Research for An Automatic MIG Welding Machine of Catalyst Converter of Automobile Two different schemes for automatic MIG welding of catalyst converter of automobile have been compared and analysed. A design of automatic MIG welding machine used for catalyst converter of automobile has been suggested in this paper. Subject Terms:environmental protection automobile tri-catalyst converter MIG welding automatic welding PLC Fang Chucai(24) Cold Crack Analysis of Low Alloy High Strength Steel Weld Seam Heat Affected Area During the welding of low alloy high strength (X65 and above), the fine crack occurs in the weld (especially inner weld) and the low plastic hard brickle structure occurs in the Heat Affected Area (HAZ) sometime. This

  20. Deformation and Failure of the Steel Pipe under Impact Load%钢管在冲击荷载作用下的变形与失效破坏

    Institute of Scientific and Technical Information of China (English)

    田镇华; 石少卿; 崔廉明; 罗伟铭

    2014-01-01

    为研究钢管在弹体侵彻过程中的变形特点,基于ANSYS/LS-DYNA软件,采用Johnson-Cook模型,模拟了半球形弹体以不同速度正向冲击钢管时的非线性动力响应情况。结果表明:弹体速度越小,钢管的抗侵彻性能越好;弹体速度越接近临界破坏速度,钢管降低弹体速度的能力就越明显;弹体冲击钢管时,钢管上表面比下表面更容易产生大变形,消耗更多的弹体动能,并在抗侵彻过程中伴有局部凹陷、蝶形变形和贯穿现象。实验结果可为圆柱壳结构钢管在冲击荷载作用下的耗能分析提供参考。%In order to study the deformation of the steel pile under projective penetration, the nonlinear dynamic response pro-cess of the hemispherical projectile with different speed shocking into the steel pipe was numerically simulated based on the soft-ware ANSYS/LS-DYNA and Johnson-Cook model. The results demonstrate that the lower the projectile velocity is,the better the pipe steel anti-penetration performance is;when the speed is closer to the critical speed, the ability to reduce the projectile velocity is more obvious;the upper surface of the steel pipe is more prone to large deformation and consumption of kinetic energy projectile than the lower surface associated with the local dent, dish-shaped deformation and penetration phenomenon in the process of anti-penetration to prevent the bullet further penetration. The research results can be applied to analysis energy dissipation of the cylin-drical shell structure under penetration load.

  1. Technical Study of Slotted Pipe Working

    Institute of Scientific and Technical Information of China (English)

    Yang Helai; Su Feng

    1996-01-01

    @@ Introduction Slotted pipe is a kind of tool used in the oilfield for drilling wells to proof sand. There are many difficulties in working out several thousands seams which are about 0.3mm to 0.6 mm wide on a 10 meter long alloy steel pipe,and the types are various, such as straight and trapezoid.

  2. Technology for Sinking the Ultra-long-weight Steel Pipe Piles of "HaiLi 801" Whole Rotating Piping Ship%全旋转打桩船"海力801"超长超重钢管桩沉桩技术

    Institute of Scientific and Technical Information of China (English)

    王永东; 杨胜龙

    2011-01-01

    结合象山港公路大桥的钢管桩桩基施工,介绍"海力801"全旋转打桩船采用S-280型双作用液压锤和GPS卫星定位技术,沉放超长、超重、大直径钢管斜桩的施工技术.施工效果良好,可在大型海上、跨江桥梁工程和港口工程中推广应用.%Combining the construction of the steel pipe pile foundation of Xiangshan Port Highway Bridge, this paper introduces the “HaiLi 801” whole rotating piling ship adopts S - 280 type dual acting hydraulic hammer and GPS satellite positioning technology, and the construction technology of sinking ultra-long-weight and large diameter steel pipe piles.The construction has good effect can be applied for large marine project, river-crossing bridge project and harbor engineering.

  3. Causes Analysis on Fracture of a Q235B Steel Circulating Water Main Pipe%Q235B钢循环水母管断裂原因分析

    Institute of Scientific and Technical Information of China (English)

    刘倩倩; 句光宇; 王志武

    2016-01-01

    某发电公司1000 MW燃煤发电机组在运行中,Q235B 钢循环水母管发生断裂。通过宏观检验、化学成分分析、力学性能测试、金相检验、扫描电镜及能谱分析等方法,对循环水母管的断裂原因进行了分析。结果表明:循环水母管焊缝部位存在未焊透现象及焊渣、焊瘤等夹杂物,焊接质量低、显微组织异常导致焊缝处承载能力差;在腐蚀环境存在的情况下,裂纹在焊渣处形成并快速扩展,导致循环水母管断裂失效。%A circulating water main pipe of Q235B steel in a 1 000 MW coal-fired power generation of a power plant fractured during operation.The fracture causes of the circulation water main pipe were analyzed by means of macroscopic inspection,chemical compositions analysis,mechanical properties testing,metallographic inspection, scanning electron microscope analysis,energy spectrum analysis and so on.The results show that:incomplete penetration phenomenon and inclusions,such as welding slag,welding beading and so on,existed in the welding seam of the circulating water pipe;low welding quality and abnormal microstructure caused poor bearing capacity of the welding seam.In the corrosion environment,cracks generated in the area of welding slag and expanded rapidly, resulting in the fracture failure of the circulating water main pipe.

  4. Corrugation of relativistic magnetized shock waves

    CERN Document Server

    Lemoine, M; Gremillet, L

    2016-01-01

    As a shock front interacts with turbulence, it develops corrugation which induces outgoing wave modes in the downstream plasma. For a fast shock wave, the incoming wave modes can either be fast magnetosonic waves originating from downstream, outrunning the shock, or eigenmodes of the upstream plasma drifting through the shock. Using linear perturbation theory in relativistic MHD, this paper provides a general analysis of the corrugation of relativistic magnetized fast shock waves resulting from their interaction with small amplitude disturbances. Transfer functions characterizing the linear response for each of the outgoing modes are calculated as a function of the magnetization of the upstream medium and as a function of the nature of the incoming wave. Interestingly, if the latter is an eigenmode of the upstream plasma, we find that there exists a resonance at which the (linear) response of the shock becomes large or even diverges. This result may have profound consequences on the phenomenology of astrophys...

  5. Iron Line Variability of Discoseismic Corrugation Modes

    CERN Document Server

    Tsang, David

    2013-01-01

    Using a fast semi-analytic raytracing code, we study the variability of relativistically broadened iron lines due to discoseismic oscillations concentrated in the inner-most regions of accretion discs around black holes. The corrugation mode, or c-mode, is of particular interest as its natural frequency corresponds well to the ~0.1-15Hz range observed for low-frequency quasi-periodic oscillations (LFQPOs) for lower spins. Comparison of the oscillation phase dependent variability and QPO-phase stacked iron line observations will allow such discoseismic models to be confirmed or ruled out as a source of particular LFQPOs. The spectral range and frequency of the variability of the iron line due to corrugation modes can also potentially be used to constrain the black hole spin if observed with sufficient temporal and spectral resolution.

  6. 49 CFR 236.17 - Pipe for operating connections, requirements.

    Science.gov (United States)

    2010-10-01

    ... 49 Transportation 4 2010-10-01 2010-10-01 false Pipe for operating connections, requirements. 236... Rules and Instructions: All Systems General § 236.17 Pipe for operating connections, requirements. (a) Steel or wrought-iron pipe one inch or larger, or members of equal strength, shall be used for operating...

  7. Finite Temperature Casimir Effect for Corrugated Plates

    Institute of Scientific and Technical Information of China (English)

    ZHAO Yan; SHAO Cheng-Gang; LUO Jun

    2006-01-01

    @@ Using the path-integral method, the corrections to the Casimir energy due to the combined effect of surface roughness and the finite temperature are calculated. For the specific case of two sinusoidally corrugated plates,the lateral Casimir force at finite temperature is obtained. The amplitude of the lateral Casimir force has a maximum at an optimal wavelength of λ≈ 2H with the mean plate distance H. This optimal parameter relation is almost independent of temperature.

  8. Light as a key driver of freshwater biofouling surface roughness in an experimental hydrocanal pipe rig.

    Science.gov (United States)

    Ravizza, Matilde; Giosio, Dean; Henderson, Alan; Hovenden, Mark; Hudson, Monica; Salleh, Sazlina; Sargison, Jane; Shaw, Jennifer L; Walker, Jessica; Hallegraeff, Gustaaf

    2016-07-01

    Biofouling in canals and pipelines used for hydroelectric power generation decreases the flow capacity of conduits. A pipeline rig was designed consisting of test sections of varying substrata (PVC, painted steel) and light levels (transparent, frosted, opaque). Stalk-forming diatoms were abundant in both the frosted and transparent PVC pipes but negligible in the painted steel and opaque PVC pipes. Fungi were slightly more abundant in the painted steel pipe but equally present in all the other pipes while bacterial diversity was similar in all pipes. Photosynthetically functional biofouling (mainly diatoms) was able to develop in near darkness. Different biological fouling compositions generated differing friction factors. The highest friction factor was observed in the transparent pipe (densest diatom fouling), the lowest peak friction for the opaque PVC pipe (lowest fouling biomass), and with the painted steel pipe (high fouling biomass, but composed of fungal and bacterial crusts) being intermediate between the opaque and frosted PVC pipes.

  9. 低中压锅炉用电阻焊钢管的研制%The Development of the Welded Steel Pipe for Low and Medium Pressure Boiler

    Institute of Scientific and Technical Information of China (English)

    史旭峰

    2001-01-01

    Along with the hot-rolled strip quality and the level of ERW pipe manufacture improve in domestic,the factors manufacturing welded pipe for low and medium pressure boiler have possessed.It is introduced that the technology manufacturing welded pipe for low and medium pressure boiler with ERW pipe and then to be normalizing heat-treated by medium frequency induction heating.Developed welded pipe for boiler has well mechanical properties and cold-forming technology performance,the weld quality is better than the base and the size are accurate,the pipe quality fully accord with the require for the pipe of low and medium pressure boiler.%随着我国热轧卷板质量及ERW制管水平的提高,生产低中压锅炉用电阻焊钢管的条件已经成熟。介绍了采用ERW钢管再经中频感应全管体热处理生产低中压锅炉用电阻焊钢管的工艺,研制的焊接锅炉钢管具有良好的机械性能、冷作工艺性能,焊缝质量优于钢管母材,几何尺寸精度高,实物质量指标完全符合低中压锅炉用钢管的要求。

  10. 78 FR 20615 - Drill Pipe From the People's Republic of China: Preliminary Results of Countervailing Duty...

    Science.gov (United States)

    2013-04-05

    ... International Trade Administration Drill Pipe From the People's Republic of China: Preliminary Results of... review of the countervailing duty (CVD) order on drill pipe from the People's Republic of China (PRC...-4793. Scope of the Order The scope of the order consists of steel drill pipe and steel drill collars...

  11. Numerical simulation of the formation of short pitch corrugation

    Energy Technology Data Exchange (ETDEWEB)

    Mueller, S. [ABB Research Center, Heidelberg (Germany); Knothe, K. [Technical Univ. Berlin (Germany)

    2000-07-01

    The formation of periodic wear patterns on the running surface of the rail has been observed for more than a hundred years. These wear patterns are the reason for unwelcome effects like noise and damage to the track. A high number of publications was concerned with the problem and most rail corrugation types can be explained to date. Only the mechanism which leads to so called short pitch corrugation is not understood yet. Therefore, based on previous work a linear wheel-track model has been developed to understand the formation of short pitch corrugation on tangent track. Numerical simulations have been undertaken with this model to analyse the corrugation process. Based on numerical results it is tried to explain why the corrugation pitch observed in practice vary little with train speed and it is shown how wheel-rail parameters influence the proneness to corrugation. (orig.)

  12. Investigation on Mechanical Property of Seamless Pipe

    Institute of Scientific and Technical Information of China (English)

    ZHAO Li-ming; YANG Xiao-yong; LIU Ye

    2004-01-01

    The mechanical properties of the steel pipe rolled with continuously casting round billet after determining the chemical composition in steel were studied. The results show that the total reduction ratio should be higher than 5.2 when the line pipes of grade B, grade 20 and other general seamless pipe were rolled with continuously casting round billet. And the total reduction ratio should be higher than 10.2 and the grain size should be controlled more than grade 7 for casing of oil countryside tubular goods (OCTG).

  13. Spinning pipe gas lens revisited

    CSIR Research Space (South Africa)

    Mafusire, C

    2008-01-01

    Full Text Available The graded index (GRIN-like) medium generated by gas inside a heated steel pipe when rotated about its longitudinal axis has the ability to focus a laser beam. While the effective focal length of such a system has previously been studied...

  14. Silicon Carbide Corrugated Mirrors for Space Telescopes Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Trex Enterprises Corporation (Trex) proposes technology development to manufacture monolithic, lightweight silicon carbide corrugated mirrors (SCCM) suitable for...

  15. Survival of indicator organisms, e.g. E. coli in drinking water pipes

    DEFF Research Database (Denmark)

    Albrechtsen, Hans-Jørgen; Silhan, J.; Corfitzen, Charlotte B.

    2006-01-01

    The survival of E. coli was investigated in used drinking water pipes from households. The investigation showed that E. coli survived longer in plastic pipes than in cupper pipes and galvanized steel pipes. The investigation also showed longer survival at cold water temperatures (15?C) than at hot...

  16. INVESTIGATION INTO THE SPRINGBACK OF PIPE BENDING USING INDUCTION HEATING

    Institute of Scientific and Technical Information of China (English)

    1998-01-01

    Stresses and deformation states of pipe bending are investigated under loading or unloading with various pipe materials, size, bending radius and deformation temperature. A theorem of springback of large diameter pipe bending is presented. The experiments are carried out with pipe materials of 20, 10CrMo910 and 12Cr1MoV steel. Results of computations are in good agreement with experiments.

  17. 钢骨架聚乙烯塑料复合管内金属体规范接地的必要性%Necessity of Specified metal body grounding for steel skeleton PE plastic composite pipe

    Institute of Scientific and Technical Information of China (English)

    项立榕

    2016-01-01

    本文针对新型管材钢骨架聚乙烯塑料复合管金属的属性以及管道应用中存在缺失接地措施的现象,结合多部国家电气相关规范的要求,提出钢骨架聚乙烯塑料复合管内金属体规范接地的必要性。同时,利用复合管钢骨架的自然条件,给出相应的接地解决办法,对避免和减少在爆炸和火灾危险环境应用可能造成的巨大损失,及管道行业的安全可持续发展意义重大,为开辟和扩大钢骨架聚乙烯塑料复合管的应用范围提供了重要技术支撑,是具有极大应用潜力及经济效益的一项措施。%According to material properties of new type steel skeleton polyethylene plastic composite pipe,and the existing phenomenon of missing grounding measures on pipeline application,combined with requirements in some related national electrical specifications,the ne-cessity of metal body specified grounding in steel skeleton polyethylene plastic composite tube was proposed. At the same time,by the natu-ral conditions of composite tube steel skeleton,corresponding grounding solution approaches were put forward. It can avoid and reduce huge loss which might caused in explosion or fire dangerous environment,and has much help for save and sustainable development of pipeline in-dustry. It provides important technical support to explore and expand the application of steel skeleton polyethylene plastic composite pipe, and is a measure of great potential and economic benefits.

  18. Applications of the essay at slow deformation velocity in pipes of stainless steel AISI-304; Aplicaciones del ensayo a velocidad de deformacion lenta en tuberias de acero inoxidable AISI-304

    Energy Technology Data Exchange (ETDEWEB)

    Zamora R, L.; Mora R, T. De la [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2004-07-01

    Nowadays is carried out research related with the degradation mechanisms of structures, systems and/or components in the nuclear power plants, since many of the involved processes are those responsible for the dependability of these, of the integrity of the components and of the aspects of safety. The purpose of this work, was to determine the grade of susceptibility to the corrosion of a pipe of Austenitic stainless steel AISI 304, in a solution of Na CI (3.5%) to the temperatures of 60 and 90 C, in two different thermal treatments - 1. - Sensitive 650 C by 4 hours and cooled in water. 2. Solubilized to 1050 C by 1 hour and cooled in water.

  19. 钢管折叠门及铰链式插销设计%The Design of Steel-pipe Pull-down Door and Hinge-type latch

    Institute of Scientific and Technical Information of China (English)

    吴福明; 赵天婵

    2000-01-01

    介绍了一种钢管折叠门及铰链式插销的设计。该设计解决了门关闭时整体刚度差、门打开时存在死点的问题,可借助铰链式插销锁紧折叠门。%This article introduce a design of steel-pipe Pull-down door and hinge-type latch. This design preferably solves the technical problems when do designing the door in pre-design, such as integral rigidity being not very good, exciting fatal points when opening the door and so on. We can conveniently lock the pull-down doors by the hinge-type latch. The effect has been proved well by trial-manufacture and putting to use.

  20. 拱构型门式新型钢管脚手架应用技术研究%Research on application technique of arch portal new steel-pipe scaffold

    Institute of Scientific and Technical Information of China (English)

    黄成立

    2012-01-01

    Combining with factual examples, the paper introduces the application of the arch portal new steel-pipe scaffold in high-rise build- ings, illustrates the respective design schemes and erection process, and points out the operation points of all steps, and provides the reference methods for the application of the new frame body in projects.%结合具体实例,针对拱构型门式新型钢管脚手架在高层建筑中的应用进行了介绍,分别阐述了相应设计方案及搭设过程,指出了各环节中操作要点,为一种新架体在工程中应用提供了借鉴方法。

  1. 76 FR 11758 - Drill Pipe From the People's Republic of China: Countervailing Duty Order

    Science.gov (United States)

    2011-03-03

    ... chemistry of the steel (i.e., carbon, stainless steel, or other alloy steel), and without regard to length or outer diameter. Also included are unfinished drill collars (including all drill collar green tubes) and unfinished drill pipe (including drill pipe green tubes, which are tubes meeting the...

  2. Mechanical behavior and numerical analysis of corrugated wire mesh laminates

    Energy Technology Data Exchange (ETDEWEB)

    Choi, Jeong Ho; Shankar, Krishna; Tahtali, Murat [UNSW, ADFA, Canberra (Australia)

    2012-01-15

    The objective is to show a possibility of corrugated wire mesh laminate (CWML) structure for bone application. CWML is a part of open-cell structures with low density and high strength built with bonded mesh layers. Specimens of CWML made of 316 stainless steel woven meshes with 0.22 mm wire diameter and 0.95 mm mesh aperture, bonded by transit liquid phase (TLP) at low temperatures, were fabricated and tested under quasi-static conditions to determine their compressive behavior with varying numbers of layers of the sample. The finite element software was used to model the CWML and studied their response to mechanical loading. Then, the numerical model was confirmed by the tested sample. Consequently, CWML specimens were reasonably matched with the human tibia bone ranged over apparent density from 0.05 to 0.08 g/cm{sup 3} in Young's modulus and from 0.05 to 0.11 g/cm{sup 3} in compressive yield strength. The CWML model can have the potential for bone application.

  3. Longitudinal Strain Capacity of GMAW Welded High Niobium (HTP) Grade X80 Steel Pipes%GMAW焊接的HTP高铌X80管线钢管的纵向应变容量

    Institute of Scientific and Technical Information of China (English)

    马小芳

    2013-01-01

    对低C高Nb微合金化的HTP工艺X80管线钢管GMAW焊接纵向环焊缝力学性能和断裂性能做了定量分析,试验使用X80级1219 mm×22 mm UOE直缝埋弧焊管,在弯曲宽板试样的焊接中心线和HAZ表面开缺口试验,对母材和焊缝的拉伸性能、屈服强度过匹配、 V形缺口夏比冲击韧性、 CTOD韧性、宽板拉伸试验结果进行了分析。结果表明,-20℃下,高Nb HTP管线钢管可以达到很大的纵向后屈服应变,同时证明了8%的过匹配是比较合理的要求。%This paper presents the results of an experimental study aimed at quantifying the mechanical and fracture properties of GMAW girth welds in an HTP low carbon high Nb micro-alloyed,1 219 mm by 22 mm wall longitudinal welded Grade X80 steel pipes. The weld centerline and HAZ surface notched curved wide plate tensile tests have demonstrated that overmatched girth welds in high Nb HTP steel pipes can accommodate significant longitudinal post yield strains at -20 ℃. It was also demonstrated that a minimum yield strength overmatch of 8%can be used as a rational requirement.

  4. Steel pipe's fixed-length cutting control system based on fuzzy self-adaptive PID%基于模糊自适应PID的钢管定长切割控制系统

    Institute of Scientific and Technical Information of China (English)

    盛强

    2011-01-01

    Aiming at the weak points of traditional steel pipe's fixed-length cutting control method on flying-saw machine,a control strategy based on the fuzzy self-adaptive PID method was proposed. The inputs required by the control model are fixed-length cutting error and the error change rate,and the model gives the correct additional setpoint for the three parameters of PID control individually. Thus the on-line automatic adjustment of the PID parameters was achieved. The fuzzy self-adaptive PID control was compared with traditional PID by simulation through Matlab. The results indicate that the steel pipe's fixed-length cutting dynamic control performs much better by using the fuzzy self-adaptive PID control strategy.%针对钢管定尺飞锯传统定长切割控制策略存在的问题,提出了采用模糊自适应PID的控制策略.控制器输入取钢管的定长切割偏差e和偏差变化率ec,输出取PID控制器3个参数的修正量,从而实现了PID参数的在线自整定.采用Matlab语言,进行了常规PID控制与模糊自适应PID控制动态性能的仿真比较.研究结果表明,采用模糊自适应PID控制可明显提高定尺飞锯定长切割控制系统的动态性能.

  5. 工程用35CrMo钢钻杆螺纹断裂失效分析%Failure Analysis of the Fracture Drill Pipe thread of 35 CrMo Steel used in engineering

    Institute of Scientific and Technical Information of China (English)

    王洪礼; 王凌; 刘立新

    2014-01-01

    The chemical composition, Vickers hardness,Rockwell hardness,microstructure and micrograph of fracture surface of a failed drill pipe thread which was made of 35CrMo steel used in engineering was analyzed by Q8 spark emission spectrometer, Rockwell apparatus,Vickers hardness tester and Optical microscopy.The results showed that the chemical composition of fracture drill pipe thread is normal, and the microstructure of the fracture drill pipe thread were abnormal resulted from improper heat treament and have important theory significance and academic valve.%应用Q8火花直读发射光谱仪、维氏硬度计、数显洛氏硬度计和金相显微镜,对工程用35CrMo钢钻杆螺纹断裂件的化学成分、维氏硬度、洛氏硬度、断口宏观形貌和微观组织进行了分析。结果表明,断裂钻杆的化学成分符合标准要求;热处理工艺不稳定,出现非正常组织为钻杆断裂失效的主要原因,研究为进一步优化钻杆热处理工艺提供了重要依据,具有重要的理论意义及工程应用价值。

  6. Application of Large Diameter Steel Pipe Spigot Joint in Water Pipeline%大直径钢管承插式连接在输水管道中的应用

    Institute of Scientific and Technical Information of China (English)

    夏连宁

    2015-01-01

    结合北美成熟使用近60年的承插式柔性接口和美国水行业协会(AWWA)标准对钢管承插式接口的要求, 详细介绍了承插式接口连接的标准和规范、 管端承口和插口的设计和加工制作方法, 以及制造和安装时应注意的问题. 指出: 采用胶圈密封时, 承插连接的钢管选用螺旋埋弧焊管;在非开挖工程中采用帕姆洛克(Permalok)承插式钢管连接, 该承插式快速丝扣刚性连接钢管不需要现场焊接, 钢管选用直缝焊管.%Combined with spigot joint of non-restrained gasket connection application in North America nearly 60 years and the requirements of AWWA standard for steel pipe spigot joint, it detailedly introduced the standard and norm, the design, fabrication and installation for the joints of rolled groove type and Carnegie type,and some matters needing attention. It pointed that it should use SAW pipe for rubber gasket sealing, and adopt Permalok fast joint on longitudinal welded pipe in the trenchless application with no field welding.

  7. Carneiro hidráulico com tubulação de alimentação em aço galvanizado e em PVC Hydraulic ram pump perfomance with PVC and steel pipes

    Directory of Open Access Journals (Sweden)

    Caroline Abate

    2002-03-01

    Full Text Available A recente crise da energia convencional tem ocasionado a exploração de fontes alternativas de energia. O bombeamento de água utilizando carneiro hidráulico é amplamente empregado em propriedades onde a energia elétrica é escassa ou inexistente. Procurando dar subsídios técnicos para a utilização do PVC nos sistemas de alimentação de um carneiro hidráulico, foi desenvolvido um experimento com objetivo de avaliar o desempenho de um carneiro hidráulico quando alimentado por uma tubulação de PVC e outra de aço galvanizado, sob três alturas de queda (2,1, 3,8 e 4,7 m. Foi utilizada a equação de D'Aubussion's para a avaliação do rendimento, calculado a partir de leituras de altura de recalque, vazão de escape, vazão de recalque e altura de alimentação. Pode-se conseguir o máximo rendimento com o carneiro hidráulico utilizando-se de tubulação de PVC com até 4,2 m de desnível; além desse valor a tubulação de aço galvanizado é mais eficiente.The recent conventional energy crisis is leading to the exploration of alternative energy sources. The pumping of water using ram pumps is widely used in farms where electric energy is scarce or inexistent. This experiment was carried out to evaluate the performance of an hydraulic ram pump utilizing two kinds of supply pipes (PVC and steel using three different supply heads (2.1, 3.8 and 4.7. Delivery head, delivery discharge, waste discharge and supply head were utilized to calculate the yield of the hydraulic ram by the equation of D'Aubussion. The maximum yield of the hydraulic ram was obtained for the PVC pipe for the 4.2 m head; for heads higher than 4.2 m the steel pipe was more efficient.

  8. Piping Flexibility

    Science.gov (United States)

    1978-01-01

    A NASA computer program aids Hudson Engineering Corporation, Houston, Texas, in the design and construction of huge petrochemical processing plants like the one shown, which is located at Ju'aymah, Saudi Arabia. The pipes handling the flow of chemicals are subject to a variety of stresses, such as weight and variations in pressure and temperature. Hudson Engineering uses a COSMIC piping flexibility analysis computer program to analyze stresses and unsure the necessary strength and flexibility of the pipes. This program helps the company realize substantial savings in reduced engineering time.

  9. Piping Analysis

    Science.gov (United States)

    1980-01-01

    Burns & McDonnell provide architectural and engineering services in planning, design and construction of a wide range of projects all over the world. In design analysis, company regularly uses COSMIC computer programs. In computer testing piping design of a power plant, company uses Pipe Flexibility Analysis Program (MEL-21) to analyze stresses due to weight, temperature, and pressure found in proposed piping systems. Individual flow rates are put into the computer, then computer calculates the pressure drop existing across each component; if needed, design corrections or adjustments can be made and rechecked.

  10. Heat pipes

    CERN Document Server

    Dunn, Peter D

    1994-01-01

    It is approximately 10 years since the Third Edition of Heat Pipes was published and the text is now established as the standard work on the subject. This new edition has been extensively updated, with revisions to most chapters. The introduction of new working fluids and extended life test data have been taken into account in chapter 3. A number of new types of heat pipes have become popular, and others have proved less effective. This is reflected in the contents of chapter 5. Heat pipes are employed in a wide range of applications, including electronics cooling, diecasting and injection mo

  11. Water electrolyte transport through corrugated carbon nanopores.

    Science.gov (United States)

    Moghimi Kheirabadi, A; Moosavi, A

    2014-07-01

    We investigate the effect of wall roughness on water electrolyte transport characteristics at different temperatures through carbon nanotubes by using nonequilibrium molecular dynamics simulations. Our results reveal that shearing stress and the nominal viscosity increase with ion concentration in corrugated carbon nanotubes (CNTs), in contrast to cases in smooth CNTs. Also, the temperature increase leads to the reduction of shearing stress and the nominal viscosity at moderate degrees of wall roughness. At high degrees of wall roughness, the temperature increase will enhance radial movements and increases resistance against fluid motion. As the fluid velocity increases, the particles do not have enough time to fully adjust their positions to minimize system energy, which causes shearing stress and the nominal viscosity to increase. By increasing roughness amplitude or decreasing roughness wavelength, the shearing stress will increase. Synergistic effects of such parameters (wall roughness, velocity, ion concentration, and temperature) inside corrugated CNTs are studied and compared with each other. The molecular mechanisms are considered by investigating the radial density profile and the radial velocity profile of confined water inside modified CNT.

  12. Simulative computation of rolling force in cold pilgering process of high-accuracy stainless steel pipe%高精度不锈钢管轧制过程轧制力仿真计算

    Institute of Scientific and Technical Information of China (English)

    成海宝; 赵铁勇; 郝瑾; 纪松山; 展京乐; 张杰

    2012-01-01

    针对钢管冷轧过程轧制力的影响因素多、计算复杂的问题,本文以舍瓦金提出的轧制力计算方法为依据,利用Fortran语言开发了轧制力计算模拟程序,该程序可用来分析送进量、压下量、孔型参数等对轧制力分布的影响.并以轧制奥氏体不锈钢管1Cr18Ni9Ti为例,研究了送进量和管坯厚度对轧制力分布的影响.%Since there are lots of factors which affect the rolling force in the steel pipe cold-rolling processes, and the calculation process of the rolling force is complex, a simulation program for rolling force calculation was developed with Fortran language, according to Shevakii proposed calculation method. The program can be used to analyze the influence of feeding quantity, reduction and die parameters on rolling force distribution. Finally, taking the austenitic stainless steel lCrl8Ni9Ti as example, the influence of feeding and hollow thickness on the rolling force distribution is studyed.

  13. Demonstration and Validation of Controlled Low-Strength Materials for Corrosion Mitigation of Buried Steel Pipes: Final Report on Project F09-A17

    Science.gov (United States)

    2015-12-01

    812 Park Drive Warner Robins , GA 31088 James B. Bushman and Bopinder S. Phull Bushman and Associates P. O. Box 425 Medina, OH 44258 Final report...Under Project F09-AR17, “Dilute Flowable Backfill Validation for Corrosion Mitigation of Buried Piping at Fort Hood , TX” ERDC/CERL TR-15-33 ii...Appendix C: Fort Hood Demonstration Equipment and Materials for ROI Analysis

  14. 钢质压力管道模态的有限元分析%The Finite Element Analysis Method Steel Pressure Pipe Modal

    Institute of Scientific and Technical Information of China (English)

    毛民·阿斯哈尔; 任国栋

    2013-01-01

    Describe the ansys software functionality as well as the pressure piping modal theory calculation and use ansys software for modal analysis method, came to the conclusion with the main steps of the software analysis modal. Therefore,the vibration control of pressure pipe away from the natural frequency is in order to avoid leaving the piping system failure occurs failure resonance.%  主要介绍了ansys软件的功能以及压力管道的模态理论计算方法,最后提出了使用ansys软件进行模态分析方法,并得出用该软件分析模态的主要步骤。并且使得在工作中压力管道的震动控制一定要远离固有频率,以避免发生共振而使管道系统发生破坏失效。

  15. Effects of Induction Heat Bending and Heat Treatment on the Boric Acid Corrosion of Low Alloy Steel Pipe for Nuclear Power Plants

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Ki-Tae; Kim, Young-Sik [Andong National University, Gyeongbuk (Korea, Republic of); Chang, Hyun-Young; Park, Heung-Bae [KEPCO EandC, Gyeongbuk (Korea, Republic of); Sung, Gi-Ho; Shin, Min-Chul [Sungil SIM Co. Ltd, Busan (Korea, Republic of)

    2016-11-15

    In many plants, including nuclear power plants, pipelines are composed of numerous fittings such as elbows. When plants use these fittings, welding points need to be increased, and the number of inspections also then increases. As an alternative to welding, the pipe bending process forms bent pipe by applying strain at low or high temperatures. This work investigates how heat treatment affects on the boric acid corrosion of ASME SA335 Gr. P22 caused by the induction heat bending process. Microstructure analysis and immersion corrosion tests were performed. It was shown that every area of the induction heat bent pipe exhibited a high corrosion rate in the boric acid corrosion test. This behavior was due to the enrichment of phosphorous in the ferrite phase, which occurred during the induction heat bending process. This caused the ferrite phase to act as a corrosion initiation site. However, when re-heat treatment was applied after the bending process, it enhanced corrosion resistance. It was proved that this resistance was closely related to the degree of the phosphorus segregation in the ferrite phase.

  16. New Technology Application of HUC Combined Steel Slab Piles in the Construction of Some Underground Pipe Gallery%HUC组合钢板桩新工艺在某地下综合管廊施工中的应用

    Institute of Scientific and Technical Information of China (English)

    郁雷

    2014-01-01

    基坑支护必须遵循在确保周围环境安全和基坑开挖安全的前提下做到经济合理、快速施工、方便施工的原则。结合昆山花桥国际商务城规三路、薛赵路、绿地大道综合管廊市政工程中新型HUC组合钢板桩的成功应用,通过力学计算选择了合适的HUC组合钢板桩型号,并对HUC组合钢板桩深基坑施工技术进行了详细介绍,突破了深基坑安全高效且施工成本低的限制。%Foundation excavation must follow the principle that economically rational, rapid construction, convenient construction in the precondition for ensuring the safety of excavation and foundation excavation under the safety of surrounding environment. According to the successful application of a new type of HUC combined steel sheet pile in Kunshan Huaqiao International Business City Planning Comprehensive Pipe Gallery Three Road, Xue Zhaolu Road, green space in the municipal engineering for example, calculated by mechanics, the author chooses HUC combined steel sheet piles of appropriate size. And the HUC combined steel sheet piles of deep foundation excavation construction technology is introduced in detail, which breaks through the safety of foundation excavation with high efficiency and low construction cost constraints.

  17. HPE液压垂直插入机施作钢管柱施工技术%HPE Hydraulic Vertical Inserting Machine Applied Construction Technology of Steel Pipe Column

    Institute of Scientific and Technical Information of China (English)

    朱元生

    2012-01-01

    This paper,based on the South Station in Wuhan Metro Steel Pipe Column construction practice,discusses in detail the vertical insertion of the HPE hydraulic facilities for steel column construction process principles,processes,operating points and quality control requirements.Test data proves that the advanced technology is reliable,can assure quality,solving problems in the traditional steel column installation such as no assurance of the security of artificial positioning,the complex construction process,long duration,high cost,and reduces the construction period of South Station by five months,to break the constraints bottleneck of duration%结合武汉地铁中南路站钢管柱施工实践,详细论述了HPE液压垂直插入机施作钢管柱施工技术的工艺原理、工艺流程、操作要点和质量控制要求。检测数据证明,该技术先进可靠,能保证质量,突破了传统钢柱安装人工定位存在的安全不能保障、施工工序复杂、工期比较长、成本较高等诸多难题,并使中南路车站施工工期提前了5个月,打破了工期制约的瓶颈。

  18. Multiple blowdown pipe experiments with the PPOOLEX facility

    Energy Technology Data Exchange (ETDEWEB)

    Puustinen, M.; Laine, J.; Raesaenen, A. (Lappeenranta Univ. of Technology, Nuclear Safety Research Unit (Finland))

    2011-03-15

    This report summarizes the results of the experiments with two steel blowdown pipes carried out with the scaled down PPOOLEX test facility designed and constructed at Lappeenranta University of Technology. Steam was blown into the dry well compartment and from there through the blowdown pipes to the condensation pool. The main purpose of the experiment series was to study chugging phenomena (rapid condensation) while steam is discharged through two parallel blowdown pipes into the condensation pool filled with sub-cooled water. Particularly, the aim was to study if the pipe material (polycarbonate) used in the earlier experiment series with two blowdown pipes has had an effect on the general chugging behaviour and measured loads. In the experiments the initial temperature of the pool water was 20 deg. C. The steam flow rate ranged from 220 g/s to 2 350 g/s and the temperature of incoming steam from 148 deg. C to 207 deg. C. The formation and collapse of steam bubbles and the movement of the steam/water interface inside the pipes was non-synchronous. There could be even a 70 ms time difference between the occurrences of steam bubble collapses at the outlets of the two pipes. There was no clear pattern in which pipe the steam bubble first starts to collapse. Several successive bubbles could collapse first in either pipe but then the order changed for a single or several cycles. High pressure loads were measured inside the blowdown pipes due to rapid condensation of the steam volumes in the pipes and resulting water hammer effects. The loads seemed to be higher in pipe 1 than in pipe 2. An explanation for this could be a possible unequal distribution of steam flow between the two pipes. The pipe material has an effect on the condensation phenomena inside the blowdown pipes. A huge difference in the measured pressure curves inside the pipes could be observed compared to the experiments with the polycarbonate pipes. With the same test conditions the amplitude of the

  19. Application of the Electricity Motor Driving Pipe End Beveling Machine in Cr-Mo Heat-resistant Alloy Steel Pipe Groove Processing%电动管端坡口机在铬钼耐热钢管坡口加工中的应用

    Institute of Scientific and Technical Information of China (English)

    何文洲

    2014-01-01

    管道在安装前都需要进行坡口加工,坡口加工质量优劣直接影响焊接质量。对常用坡口加工机具及其加工质量进行了比较分析,阐述了电动管端坡口机的结构组成和工作原理。应用效果显示:电动管端坡口机在铬钼耐热合金钢管焊接工序中加工出来的坡口平整光亮,保证了焊接质量,省时高效,避免了采用其他方式加工坡口造成的各种质量问题。而且针对钢质管道安装维修特点,提出采用直流电机和便携式锂离子电源,省时高效、经济环保。%Before pipeline installation, the pipe need bevel process, and bevel machining quality directly affects welding quality. In this article, it made a comparative analysis on the common bevel processing equipment and its processing quality, and expatiated the structure and working principle of electricity motor driving pipe end beveling machine. The application results indicated that the bevel is smooth and bright by using electricity motor driving pipe end beveling machine in Cr-Mo heat-resistant alloy steel pipe welding process. It ensures the welding quality, time-saving and efficient, avoiding various quality problems caused by other methods of processing bevel. According to the characteristics of the pipeline installation and maintenance, it put forward using DC motor and portable lithium-ion power resource, it is with time-saving and efficient, economic and environmental protection.

  20. External Corrosion of Pipes in District Heating Systems; Utvaendig korrosion paa fjaerrvaermeroer

    Energy Technology Data Exchange (ETDEWEB)

    Sund, Goeran [Det Norske Veritas, Stockholm (Sweden)

    2002-07-01

    Corrosion damages of pipes in district heating systems can occur both external and internal. The aim with this work has been to clarify external corrosion damages of pipes, and try to correlate the damages to the corrosivity of different soils and waters. For the analysis the Swedish District Heating Association's district heating system statistics has been used. The district heating system statistics shows that the cost for corrosion damages is high, and pipes older than 20 years have increased risk for corrosion. The knowledge about corrosion concerning steel poles and water pipes in soils can not be applied to external corrosion of steel pipes in district heating systems. The corrosion rate of steel poles in soils is low. The corrosion of steel pipes in district heating systems can locally give high rates, up to 0,5 mm/year. The mechanism for this type of corrosion is different compared to the corrosion mechanism of poles in soils. The temperature is higher and aggressive water, with road-salt and chloride content, falls in drops on the steel pipe, and impurities evaporate on the steel surface. These factors increase the corrosion rate. If the material thickness is 5 mm, fracture can occur in the pipe within ten years. The number of copper pipe corrosion damage is limited. The most determining corrosion factors of copper pipes are pH-value and impurities as chloride and sulphate in the water. Stainless steel pipes of type 304 can not be used in soils due to the risk of local corrosion. Higher alloyed stainless steels, with molybdenum and higher chromium content should be used. It is concluded that failures can occur due to external corrosion of steel pipes. This failure is expensive and can lead to human damage. One way to eliminate failures of steel pipes is to carry out risk analysis.

  1. Mathematical Model for Thin-walled Corrugated Tube under Axial Compression

    Directory of Open Access Journals (Sweden)

    Eyvazian Arameh

    2016-01-01

    Full Text Available In this research, theoretical investigation of corrugated aluminum tubes is performed to predicting the energy absorption characteristics. Aim to deform plastic tubes in predetermined intervals, corrugations are introduced on its surface. Theoretical relations are presented for predicting the energy absorption and mean crushing load of corrugated tubes. Other than that, corrugation helps to control the failure mode.

  2. Effective Thermal Conductivity of Corrugated Insulating Materials

    Science.gov (United States)

    Yamada, Etsuro; Kato, Masayasu; Tomikawa, Takayuki; Takahashi, Kaneko

    The effective thermal conductivity of corrugated insulating materials which are made by polypropylene or polycarbonate have been measured by employing steady state comparison method for several specimen having various thickness and specific weight. The thermal conductivity of them evaluated are also by using the thermal resistance models, and are compared with above measured values and raw materials' conductivity. The main results obtained in this paper are as follows: (1) In regard to the specimen in this paper, the effective thermal conductivity increases with increasing temperature, but the increasing rate of them is small. (2) There are considerable differences between the measured values and the predicted ones that are estimated by using the thermal resistance model in which heat flow by conduction only. This differences increase with increasing specimens' thickness. This difference become extinct by considering the coexistence heat flow of conduction and radiation in the air phase of specimen. (3) The thermal resistance of specimen increases linearly with increasing specimens' thickness.

  3. Progress in Spiral Saw Steel Pipe Manufacturing Technology Promotes Construction of Oil/Gas Long-Distance Pipelines in West China

    Institute of Scientific and Technical Information of China (English)

    Huang Zhiqian

    1997-01-01

    @@ Introduction Since the tremendous development of oil and gas exploration achieved in West China at the beginning of 1990's, it is demanded to build several long-distance oil/gas pipelines to transmit the crude oil and natural gas from Tarimu Basin, Tuha Basin, Junggar Basin as well as Shaan-Gan-Ning Basin to the cities of Urumuqi,Klamayi, Xi'an and Beijing (details see Table 1). The total length of pipelines is more than 3 200 km, and the natural conditions along the pipelines are very harsh. This raises a challenge to the Chinese pipe manufacturing industry.

  4. Welding technologies for martensitic 9% Cr steels (P91, P92) with a view to cyclic strength of welds in high-pressure pipes carrying 600 degC steam. Experience with the welding of P91 in a current project; Schweisstechnische Verarbeitungshinweise fuer martensitische 9% Cr-Staehle (P91, P92) mit Blick auf die Zeitstandfestigkeit von Schweissnaehten in Hochdruckleitungen mit 600graedigem Dampf. Erfahrungen mit der Verarbeitung von P91 aus einem laufenden Projekt

    Energy Technology Data Exchange (ETDEWEB)

    Wachter, Otto [E.ON, Hannover (Germany); Bader, Mirko [E.ON Engineering GmbH, Gelsenkirchen (Germany)

    2010-07-01

    During the manufacturing of a HP-pipeline with the steel P91 severe deviations occurred on the site of a CCGT-plant in the heat treatment of the welds. By means of scientific performed investigations on P92, steel similar to P91, it is shown the detrimental outcome on the creep strength. The remedial actions were described. The significance of a reliable, completely documented heat treatment in connection with the proof of the uniformity of the tempering by hardness measurements supported by an adequate, independent inspection is underlined. Practical indications for the heat treatment concerning complex piping design and mobile hardness measurements for small piping systems complete the presentation.

  5. Corrugation Stuffed Shield for Spacecraft and Its Performance

    Institute of Scientific and Technical Information of China (English)

    LIU You-ying; WANG Hai-fu

    2006-01-01

    A corrugation stuffed shield system protecting spacecrafts against meteoroid and orbital debris (M/OD) is presented. The semi-empirical ballistic limit equations (BLEs)defining the protection capability of the shield system are given, an d the shielding performance is also discussed. The corrugation stuffed shield (CSS) is more effective than stuffed Whipple shield for M/OD protection,and its shielding performance will be improved significantly as increasing the impact angle. Orbital debris up to 1cm in diameter can be shielded effectively as increasing the impact angle to 25° at the corrugated angle of 30°. The results are significant to spacecraft design.

  6. CONTRIBUTIONS ON THE DESIGN OF UNCONVENTIONAL CORRUGATED BOARD STRUCTURES

    Directory of Open Access Journals (Sweden)

    NEIDONI Nadina

    2015-06-01

    Full Text Available The paper depicts a few contributions on the design of several unconventional corrugated board structures. In general, cardboard and corrugated cardboard is strongly linked to packaging. However, limiting these materials to their primary use does nothing else but to restrict the possibilities of using them in other interesting areas. Consequently, new structures built from cardboard have been imagined and in the paper there are presented a few unconventional uses of the corrugated fiberboard, namely as furniture elements, along with the technology used in the design and the manufacturing process.

  7. Software Design and Application of Ultrasonic Automatic Flaw Detection System of Welded Steel Pipes%焊接钢管超声波自动探伤系统中的软件设计与应用

    Institute of Scientific and Technical Information of China (English)

    常少文

    2011-01-01

    The software design of pipe ultrasonic automatic flaw detection system, and its application on welded steel pipes production were introduced. It combined traditional ultrasonic inspection technology with some advanced technologies, such as industrial control computer, virtual instrument, intelligent flaw detection, etc. With the careful programming flaw detection operation, it could evaluate correctly and select strictly for complex flaw echo, its error in alarm could be effectively avoided. The review of flaw echo waveform overcame insufficiency of flaw category identification in ultrasonic automatic inspection, and achieved misinformation rate being smaller than 2%, and fail to report rate being zero.%分析了焊接钢管超声波自动探伤系统的软件设计以及在焊接钢管检测中的应用状况.把传统的超声波检测技术和先进的工业控制计算机、虚拟仪器和智能化探伤等技术相结合,配合精心编制的探伤操作程序,可做到对复杂缺陷回波的准确评价和严格筛选,有效地避免了系统的误报警.缺陷波形回放功能克服了超声波自动探伤中的缺陷种类难以识别的不足,并做到误报率<2%,漏报率为0.

  8. A Multifrequency Notch Filter for Millimeter Wave Plasma Diagnostics based on Photonic Bandgaps in Corrugated Circular Waveguides

    Directory of Open Access Journals (Sweden)

    Wagner D.

    2015-01-01

    Full Text Available Sensitive millimeter wave diagnostics need often to be protected against unwanted radiation like, for example, stray radiation from high power Electron Cyclotron Heating applied in nuclear fusion plasmas. A notch filter based on a waveguide Bragg reflector (photonic band-gap may provide several stop bands of defined width within up to two standard waveguide frequency bands. A Bragg reflector that reflects an incident fundamental TE11 into a TM1n mode close to cutoff is combined with two waveguide tapers to fundamental waveguide diameter. Here the fundamental TE11 mode is the only propagating mode at both ends of the reflector. The incident TE11 mode couples through the taper and is converted to the high order TM1n mode by the Bragg structure at the specific Bragg resonances. The TM1n mode is trapped in the oversized waveguide section by the tapers. Once reflected at the input taper it will be converted back into the TE11 mode which then can pass through the taper. Therefore at higher order Bragg resonances, the filter acts as a reflector for the incoming TE11 mode. Outside of the Bragg resonances the TE11 mode can propagate through the oversized waveguide structure with only very small Ohmic attenuation compared to propagating in a fundamental waveguide. Coupling to other modes is negligible in the non-resonant case due to the small corrugation amplitude (typically 0.05·λ0, where λ0 is the free space wavelength. A Bragg reflector for 105 and 140 GHz was optimized by mode matching (scattering matrix simulations and manufactured by SWISSto12 SA, where the required mechanical accuracy of ± 5 μm could be achieved by stacking stainless steel rings, manufactured by micro-machining, in a high precision guiding pipe. The two smooth-wall tapers were fabricated by electroforming. Several measurements were performed using vector network analyzers from Agilent (E8362B, ABmm (MVNA 8-350 and Rohde&Schwarz (ZVA24 together with frequency multipliers. The

  9. MIDAS/Gen和STAAD在独立避雷针设计中的比较%Analysis Comparison of the Independent Steel Pipe Lightning Rod between MIDAS/Gen and STAAD

    Institute of Scientific and Technical Information of China (English)

    国伟; 穆德君; 盖超

    2013-01-01

      为研究单杆式钢管独立避雷针在MIDAS/Gen和STAAD 2种软件下计算结果的差别,对实际工程中的40 m避雷针建立了模型,并对模型进行了施加横向均布荷载的受力性能分析。分析结果表明,2种软件对于顶端竖向单元所受横向均布荷载具有不同的处理方式,在弯矩、应力及位移的计算结果上存在一定的误差,MIDAS/Gen的计算值均比STAAD略大,且在避雷针结构的钢管厚度及管径变化时会发生应力突变。因此,在独立避雷针的设计工作中,MIDAS/Gen的结构分析更为安全和保守,可以为STAAD的计算结果提供很好的参考价值。%In order to study the differences of the analysis result between MIDAS/Gen and STAAD about the independent steel pipe lightning rod, models of a 40 m-lightning rod was built according to the practical project in two software, which apply the transverse distributed loads to the model. The analysis results indicated that the two software consider the transverse distributed loads applied to the top vertical element with different modes, the result of MIDAS/Gen is little bigger than STAAD about the calculation of bending moment, stress and displacement, and stress mutation occurs when the thickness and diameter of steel pipe changed suddenly. Therefore, in the design of the independent lightning rod, the structural analysis of MIDAS/Gen is more conservative and safer compared with STAAD, good referenced value could be offered to STAAD by MIDAS/Gen on the aspect of analysis results.

  10. Piping Connector

    Science.gov (United States)

    1994-01-01

    In Stennis Space Center's Component Test Facility, piping lines carry rocket propellants and high pressure cryogenic fuels. When the lines are chilled to a pretest temperature of 400 degrees below zero, ordinary piping connectors can leak. Under contract to Stennis, Reflange, Inc. developed the T-Con connector, which included a secondary seal that tolerates severe temperature change. Because of the limited need for the large and expensive T-Con product, Reflange also developed the less costly E-Con, a smaller more compact design with the same technical advantages as the T-Con.

  11. Prediction of sound reflection by corrugated porous surfaces.

    Science.gov (United States)

    Allard, J-F; Dazel, O; Gautier, G; Groby, J-P; Lauriks, W

    2011-04-01

    The coupled mode (CM) and finite-element methods (FEMs) are developed and used to predict the acoustic reflection coefficient of a semi-infinite porous medium with closely spaced two-dimensional (2D) periodical corrugations. These methods are also applied to predict the reflection coefficient of a periodic array of porous corrugations installed on an acoustically rigid surface. It is shown that the predictions by the both methods agree closely. The reflection coefficient and Brewster angle of total refraction for the corrugated semi-infinite medium predicted with these methods are compared against that predicted by the Biot/Tolstoy/Howe/Twersky and extended Twersky models. A similar analysis is carried out for porous corrugations set on a rigid backing. The behavior of the reflection coefficient and the pole in the expression for the reflection coefficient located close to grazing incidence is studied.

  12. A comparative study of corrugated horn design by evolutionary techniques

    Science.gov (United States)

    Hoorfar, A.

    2003-01-01

    Here an evolutionary programming algorithm is used to optimize the pattern of a corrugated circular horn subject to various constraints on return loss, antenna beamwidth, pattern circularity, and low cross polarization.

  13. 9Cr2Mo钢高频焊管轧辊开裂原因分析%Analysis on Cracking Reason of 9Cr2Mo Steel High Frequency Welded Pipe Roller

    Institute of Scientific and Technical Information of China (English)

    何水平; 于安永; 石磊; 李雪峰

    2012-01-01

    The cracking phenomenon was found in 9Cr2Mo steel high frequency welded pipe roller when cleaning after heat treatment. Through analysis by fracture appearance, metallographic structure, mechanical properties and etc, it found some round cracking original exist in the center of fracture surface close to inside surface, the content of Ni and H is high in roller material, much more inclusion, serious dendritic segregation, and low impact value of roller. The inspection results showed that the H content of 9Cr2Mo steel roller is high, which caused hydrogen induced crack, and then induced brittle fracture under the action of stress.%针对9Cr2Mo钢高频焊管轧辊在热处理后清洗时发生开裂的现象,通过断口形貌、金相组织、化学成分、力学性能等方法进行分析,发现断面中心靠近内表面的部位有圆形裂纹源,轧辊材料中Ni和H含量偏高,夹杂物数量较多,枝晶偏析严重,轧辊的冲击值较低.检测结果表明:9Cr2Mo钢轧辊的H含量较高,导致轧辊内部产生氢致裂纹,进而在应力的作用下发生了脆性断裂.

  14. 热浸渗铝X70管线钢扩渗工艺研究%Research on Hot Diffusion Aluminizing Process of X70 Pipe Line Steel

    Institute of Scientific and Technical Information of China (English)

    黄敦伟; 胡爱萍; 张宏伟; 孔德军

    2013-01-01

    The relationship between hot diffusion aluminizing temperature,infiltration time and thickness of aluminized coating of X70 pipe line steel was researched by quadratic orthogonal regression testing method.The regression equation of the alloying layer thickness was established.The optimum process for hot diffusion aluminizing treatment was gotten.The surface and interface morphologies of X70 pipeline steel after the aluminizing treatment were observed,and Fe and Al content change by the carbonitride layer were analyzed.The element diffusion mechanism of hot dipping alumetizing process was discussed.The results show that alloying layer thickness is increased with the rising of insulation temperture and the extending of diffusion time.The ideal inoulation temperature is 950 ℃ and time is insulation 6 h.%采用二次正交回归试验方法,研究了X70管线钢热扩渗铝保温温度、扩渗时间与渗铝层厚度的关系,建立了渗层回归方程,得到X70管线钢最优的热扩渗铝工艺参数.观察了X70管线钢热浸渗铝处理后的表面、界面微观形貌,分析了Fe和Al的含量沿渗层的变化情况,并对热浸渗铝过程中的元素扩散机理进行了探讨.结果表明:渗铝层厚度随保温温度的升高和扩渗时间的延长而增大,适宜的保温温度为950℃,扩渗时间为6h.

  15. Stylus type MEMS texture sensor covered with corrugated diaphragm

    Science.gov (United States)

    Tsukamoto, Takashiro; Asao, Hideaki; Tanaka, Shuji

    2017-09-01

    In this paper, a stylus type MEMS texture sensor covered with a corrugated palylene diaphragm, which prevent debris from jamming into the sensor without significant degradation of sensitivity and bandwidth, was reported. A new fabrication process using a lost-foil method to make the corrugated diaphragm on a 3-axis piezoresistive force sensor at wafer level has been developed. The texture sensor could detect the surface microstructure as small as about 10 \

  16. Fiber Bragg Grating Pressure Sensor Based on Corrugated Diaphragm

    Institute of Scientific and Technical Information of China (English)

    FU Hai-wei; FU Jun-mei; QIAO Xue-guang

    2004-01-01

    A kind of fiber Bragg grating pressure sensor based on corrugated diaphragm is proposed. The relationship between the central wavelength of reflective wave of FBG and pressure is given, and the expression of the pressure sensitivity coefficient is also given. Within the range from results agree with the theoretical analysis. It is indicated that the expected pressure sensitivity of the sensor can be obtained by optimizing the size and mechanical parameters of the corrugated diaphragm.

  17. Competition and Co-operation in the Corrugated Paper

    OpenAIRE

    Nilsson, Carl-Henric; Axelson, Johan; Emanuelsson, Martin

    2000-01-01

    This paper describes how the five Swedish corrugated box manufacturers, while still in fierce competition, got together in 1999 to fight a new logistic system, plastic crates, which threatened to overtake a substantial part of the Swedish market for transport packaging. It explains the background of SWIF 2000, the competitive response by the five Swedish corrugated box manufacturers, how the strategy was developed, and what made the competitors work together. Many driving forces influence com...

  18. Arterial gas occlusions in operating heat pipes

    Science.gov (United States)

    Saaski, E. W.

    1975-01-01

    The effect of noncondensable gases on high performance arterial heat pipes has been investigated both analytically and experimentally. Models have been generated which characterize the dissolution of gases in condensate and the diffusional loss of dissolved gases from condensate in arterial flow. These processes, and others, have been used to postulate stability criteria for arterial heat pipes. Experimental observations of gas occlusions were made using a stainless steel heat pipe equipped with viewing ports, and the working fluids methanol and ammonia with the gas additives helium, argon, and xenon. Observations were related to gas transport models.

  19. Impact of Corrugated Paperboard Structure on Puncture Resistance

    Directory of Open Access Journals (Sweden)

    Vaidas Bivainis

    2015-03-01

    Full Text Available Thanks to its excellentprotective properties, lightness, a reasonable price, and ecology, corrugated paperboardis one of the most popular materials used in the production of packaging for variousproducts. During transportation or storage, packaging with goods can be exposedto the mass of other commodities, dropping from heights and transportationshock loads, which can lead to their puncture damage. Depending on the purposeand size of the packaging, the thickness, grammage, constituent paper layers,numbers of layers and type of fluting of corrugated paperboard used in itsproduction differ. A standard triangular prism, corrugated paperboard fixationplates and a universal tension-compression machine were used to investigate theimpact of corrugated paperboard structure and other parameters on the punctureresistance of the material. The investigation determines the maximum punctureload and estimates energy required to penetrate the corrugated paperboard. Itwas found that the greatest puncture resistance is demonstrated by paperboardwith a larger number of corrugating flutings and the board produced from harderpaper with a smaller amount of recycled paper. It was established that thegrammage of three-layered paperboard with two different fluting profiles has thegreatest impact on the level of static puncture energy.DOI: http://dx.doi.org/10.5755/j01.ms.21.1.5713

  20. Heat transfer enhancement in two-start spirally corrugated tube

    Directory of Open Access Journals (Sweden)

    Zaid S. Kareem

    2015-09-01

    Full Text Available Various techniques have been tested on heat transfer enhancement to upgrade the involving equipment, mainly in thermal transport devices. These techniques unveiled significant effects when utilized in heat exchangers. One of the most essential techniques used is the passive heat transfer technique. Corrugations represent a passive technique. In addition, it provides effective heat transfer enhancement because it combined the features of extended surfaces, turbulators and artificial roughness. Therefore, A Computational Fluid Dynamics was employed for water flowing at low Reynolds number in spiral corrugated tubes. This article aimed for the determination of the thermal performance of unique smooth corrugation profile. The Performance Evaluation Criteria were calculated for corrugated tubes, and the simulation results of both Nusselt number and friction factor were compared with those of standard plain and corrugated tubes for validation purposes. Results showed the best thermal performance range of 1.8–2.3 for the tube which has the severity of 45.455 × 10−3 for Reynolds number range of 100–700. The heat transfer enhancement range was 21.684%–60.5402% with friction factor increase of 19.2–36.4%. This indicated that this creative corrugation can improve the heat transfer significantly with appreciably increasing friction factor.

  1. Analysis and Optimisation of Carcass Production for Flexible Pipes

    DEFF Research Database (Denmark)

    Nielsen, Peter Søe

    on reels. Flexible pipes are constructed in a layer structure in which each layer adds specific properties to the pipe such as; collapse strength, fluid integrity, bursting strength, tensile strength etc. The inner-most layer of a flexible pipe is the carcass; a flexible interlocking stainless steel......Un-bonded flexible pipes are used in the offshore oil and gas industry worldwide transporting hydrocarbons from seafloor to floating production vessels topside. Flexible pipes are advantageous over rigid pipelines in dynamic applications and during installation as they are delivered in full length...... structure that provides mechanical and collapse strength for the flexible pipe. The manufacturing process of carcass is a combination of roll forming stainless steel strips and helical winding the profiles around a mandrel interlocking the profiles with themselves. The focus of the present project...

  2. Application of PeakVue Technology on Diagnosing Faults of Bearings in Steel Pipe Rolling Mill%PeakVue 技术在诊断钢管轧机轴承故障上的应用

    Institute of Scientific and Technical Information of China (English)

    田冶; 孙玉成; 毕辛; 崔通乐; 胡军; 于国江

    2014-01-01

    介绍了应用 PeakVue 技术诊断钢管轧机减速机轴承的工作状态。通过对 F2减速机轴承进行振动监测,以及对 PeakVue 峰值的研究,准确诊断出 F2减速机轴承的劣化及损坏程度,并依此制订出此轴承的寿命周期曲线。%The operating state of the reducer bearings of the steel pipe rolling mill diagnosed by the PeakVue technology is introduced. Based on the vibration monitoring for bearings of the F2 reducer and the study on the peak values of PeakVue, the damaged or degraded condition of the F2 reducer bearings is accurately diagnosed, and thus the life cycle curve of bearings is formulated based on the diagnosis.

  3. Analysis Based on the Large Span Concrete Structure Fastener Type Steel Pipe Formwork Support%基于大跨砼结构中扣件式钢管模板支架的分析

    Institute of Scientific and Technical Information of China (English)

    陈洁; 徐龄伟; 马丽娟

    2012-01-01

      [abstract] The city overpass and elevated road, elevated Brid-ges and the span larger building facilities are increasing, this is sustainable development inevitable result of the city of diver-sity and national basic building. Based on the author related conditions, the paper makes analysis of the large span concrete structure fastener type steel pipe formwork support design and application, and the research for further promotion of this technique has certain significance.%  城市中的立交桥等高架道路、高架桥梁和那些跨度比较大的建筑设施正在增多,这是城市多元化和国家基础性建筑可持续发展的必然结果。文中基于笔者相关工况,分析了大跨砼结构中扣件式钢管模板支架设计与应用,这一研究对于进一步推广这一技术具有一定的意义。

  4. The Design Research of a New-Type Steel Pipe Communication Tower%一种新型钢管通信塔的设计实践研究

    Institute of Scientific and Technical Information of China (English)

    于送洋

    2012-01-01

    Communication Tower ofLuchao Port in Donghai Bridge in Shanghai is a steel pipe tower with a new structural type. The height of the tower is 90.75 meters, all is assembled with tubes. The shape of the tower is differrent from the conventional tower it looks like a people erecting next to the East China Sea Bridge. There are four different sections of the total structure of the tower. In the design stage, some achievement after the research and optimization about the type of the tower, the calculation of the wind force, the analysis of the structure and the conformation of the joints are got.%上海东海大桥芦潮港综合通信塔采用了一种新型钢管结构的塔型.塔高90.75m,全钢管结构,全塔结构分为四个区段.此塔造型采用了有别于常规塔型的结构形式,立面外形成人字形竖立在东海大桥旁,在设计过程中,对结构形式、风荷载计算、结构分析及节点构造等进行了研究和优化,取得了较为理想的成果.

  5. 304L无缝钢管二辊斜轧穿孔裂纹的形成原因%Causes of Crack Formation in 304L Seamless Steel Pipe during Double-Roll Cross Piercing Process

    Institute of Scientific and Technical Information of China (English)

    王宝顺; 邵羽; 李三; 赵芳馨; 沈红英; 朱新强

    2013-01-01

    The mechanism of cracking in 304L seamless steel pipe during double-roll cross piercing processing was analyzed by optical microscopy, thermal-calculation ulation software and scanning electron microscopy. The results show that about 3 vol. % S ferrite phase in the billet and the heterogenous deformation of billet during the piercing process were the main causes of cracking. In addition, the difference of deformability between S ferrite phase and y phase caused both the tensile stress and the shear stress at the interface of two phases higher than the fracture strength of billet, which promoted the formation and growth of the cracks.%采用光学显微镜、热力学计算软件、扫描电镜等分析了304L无缝钢管二辊斜轧穿孔工艺中荒管内部产生裂纹的原因.结果表明:穿孔用钢坯中存在3%左右(体积分数)的δ铁素体相,穿孔工艺中不均匀变形是裂纹产生的主要原因;由于δ相和γ相变形能力不一致,在两相界面上产生超过金属断裂强度的拉应力和切应力则促进了裂纹的形成与扩展.

  6. 46 CFR 119.430 - Engine exhaust pipe installation.

    Science.gov (United States)

    2010-10-01

    ... exhaust systems must ensure minimum risk of injury to personnel. Protection must be provided in compliance... in bulkhead penetration glands for dry exhaust systems. A wet exhaust pipe may be welded to a steel... 46 Shipping 4 2010-10-01 2010-10-01 false Engine exhaust pipe installation. 119.430 Section...

  7. Silo with a Corrugated Sheet Wall

    Science.gov (United States)

    Németh, Csaba; Brodniansky, Ján

    2013-09-01

    Silos and tanks are currently being used to create reserves of stored materials. Their importance is based on balancing the production and consumption of bulk materials to establish an adequate reserve throughout the year. The case study introduced within the framework of this paper focuses on thin-walled silos made of corrugated sheets and on an approach for designing these types of structures. The storage of bulk materials causes compression or tensile stresses in the walls of a silo structure. The effect of a frictional force in the silo walls creates an additional bending moment in a wave, which ultimately affects the resulting bending moments. Several mathematical and physical models were used in order to examine various types of loading and their effects on a structure. Subsequently, the accuracy of the computational models was verified by experimental measurements on a grain silo in Bojničky, Slovakia. A comparison of the experimental and mathematical models shows a reasonable match and confirms the load specifications, while indicating that the mathematical model was correct.

  8. 近景摄影测量技术在钢岔管水压试验变形检测中的应用%Application of the Close-range Photogrammetry in Deformation Measuring in Steel Branch Pipe Hydrostatic Test

    Institute of Scientific and Technical Information of China (English)

    张怀仁; 陆鹏飞; 滕飞

    2015-01-01

    The close-range photogrammetry can be used to measure the coordinates of observation points quickly, accu-rately and in real-time without contact.Thus, an industrial photogrammetry system is adopted in the hydrostatic test of steel branch pipe to measure the coordinates of key points of the pipe under different pressure conditions.The deforma-tion can be calculated by those coordinate data.Then, the deformation of steel branch pipe under different pressure con-ditions can be analyzed.With the test data obtained from this technique, the design of steel branch pipe can be im-proved in quality reliability.%为监测钢岔管在不同压力状态下的变形量并了解其变形规律,根据近景摄影测量技术可以在非接触的情况下快速、准确、实时地测定待测点的坐标的特点,利用工业摄影测量系统进行现场测量,获取待测岔管特征点位在不同压力状态下的坐标数据,通过坐标系的建立求得岔管特征点位的变形值。结果表明,根据该方法获得的数据进行钢岔管设计,其制造质量可靠,满足工程要求。

  9. 波浪腹板构件的设计原理与工程应用%Design Principle and Application of Components with Sinusoidal Corrugated Web

    Institute of Scientific and Technical Information of China (English)

    郭彦林; 刘锋; 兰涛; 姜子钦; 陈航

    2012-01-01

    波浪腹板工形构件是由上下翼缘板与波浪腹板通过高频连续焊接而成的新型型材,适用于门式刚架轻型房屋钢结构中的梁、柱构件,吊车梁,多层钢结构框架中的主、次梁等以受弯为主的构件.以3个实际工程的结构设计为背景,介绍了波浪腹板构件的设计原理以及在门式刚架轻型房屋钢结构、多层钢结构框架和大跨度钢结构中的应用,指出了设计过程中应注意的问题.%Sinusoidal corrugated web member is' a new kind of structure of flange and sinusoidal corrugated web connected with high frequency continuous welding. This structure is suitable for beam and column components in portal frame light-weight building, crane beam, main and secondary beam in multi-story steel frame, and so on. Taking three examples from practical engineering structures, this paper presents the design principle and application of light-weight buildings with portal frame, multi -story steel frame and large span steel structure with sinusoidal corrugated web members, especially in details.

  10. 76 FR 38691 - Certain Pipe and Tube From Brazil, India, Korea, Mexico, Taiwan, Thailand, and Turkey

    Science.gov (United States)

    2011-07-01

    ...)] Certain Pipe and Tube From Brazil, India, Korea, Mexico, Taiwan, Thailand, and Turkey Institution of five-year review concerning the countervailing duty order on welded carbon steel pipe and tube from Turkey and the antidumping duty orders on certain pipe and tube from Brazil, India, Korea, Mexico,...

  11. Storage analysis of steel pipes used in pipelines; Analise do sistema de estocagem de tubos de aco para dutos de transporte

    Energy Technology Data Exchange (ETDEWEB)

    Provenzano, Carlos E.C.; Silva, Breno S.; Fernandes, Lincoln F.; Santos Junior, Sergio J.F. [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil); Louzada, Carlos H.C.M.

    2005-07-01

    New pipelines, request the use of great amount of tubes stored during its construction. Therefore, the cost generated by the storage areas motivates the reconsideration of the stockpiling system. Large areas demand high costs related to its acquisition or rent. The use of small areas can reduce the immediate cost with rent, but also can increase the total cost due to damage of the tubes or increase the risk at the storage conditions. The same considerations could be made for inadequate use of support materials on the stockpiling piles, regarding the quality or amount used. This work presents the modelling of the pyramidal stockpiling system of steel tubes and evaluations to a better configuration. (author)

  12. A Novel Pre-cooling System for a Cryogenic Pulsating Heat Pipe

    Science.gov (United States)

    Xu, Dong; Liu, Huiming; Gong, Linghui; Xu, Xiangdong; Li, Laifeng

    To reduce the influence of the pipe material on the measurement of effective thermal conductivity, the pipe of a cryogenic pulsating heat pipe is generally made of stainless steel. Because of the low thermal conductivity of stainless steel, the pre-cooling of the evaporator in cryogenic pulsating heat pipe using helium as working fluid at 4.2 K is a problem. We designed a mechanical-thermal switch between the cryocooler and the evaporator, which was on during the pre-cooling process and off during the test process. By using the pre-cooling system, the cool down time of the cryogenic pulsating heat pipe was reduced significantly.

  13. Chlorine decay in drinking-water transmission and distribution systems: pipe service age effect.

    Science.gov (United States)

    Al-Jasser, A O

    2007-01-01

    Water quality can deteriorate in the transmission and distribution system beyond the treatment plant. Minimizing the potential for biological regrowth can be attained by chlorinating the finished water. While flowing through pipes, the chlorine concentration decreases for different reasons. Reaction with the pipe material itself and the reaction with both the biofilm and tubercles formed on the pipe wall are known as pipe wall demand, which may vary with pipe parameters. The aim of this paper was to assess the impact of the service age of pipes on the effective chlorine wall decay constant. Three hundred and two pipe sections of different sizes and eight different pipe materials were collected and tested for their chlorine first-order wall decay constants. The results showed that pipe service age was an important factor that must not be ignored in some pipes such as cast iron, steel, cement-lined ductile iron (CLDI), and cement-lined cast iron (CLCI) pipes especially when the bulk decay is not significant relative to the wall decay. For the range of the 55 years of pipe service age used in this study, effective wall decay constants ranged from a decrease by -92% to an increase by +431% from the corresponding values in the recently installed pipes. The effect of service age on the effective wall decay constants was most evident in cast iron pipes, whereas steel pipes were less affected. Effective chlorine wall decay for CLCI and CLDI pipes was less affected by service age as compared to steel and cast iron pipes. Chlorine wall decay constants for PVC, uPVC, and polyethylene pipes were affected negatively by pipe service age and such effect was relatively small.

  14. Pressure tubes as GRP coiled pipes in hydropower constructions; Druckrohre als GFK-Wickelrohre im Wasserkraftwerksbau

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2009-06-15

    The times when steel was the material of choice in power plant construction are long gone. GFRP is a high-tech material for pipe construction which had a lightning career in hydropower engineering during the past few years. It has excellent construction and performance characteristics and is a good supplement or replacement material for steel. The GFRP coiled pipe system (FLOWTITE) produced by Amitech Germany at Mochau is a special type of pipe which is described in this article. (orig.)

  15. The Optimization Program of Steel Plate Feeding Device for LASW Pipe Production Line%直缝埋弧焊管生产线钢板上料装置优选方案

    Institute of Scientific and Technical Information of China (English)

    李钢; 张增全; 韩保材; 汤跃先; 汤圣先

    2015-01-01

    In this article, it described the main structure and constitute of 3 kinds of commonly used feeding device of JCOE/UOE LSAW pipe production line, including the combined converyor of roller and chain, chain conveyor and vacuum suction cups hanging conveyer, and compared the main structure and constitute with several aspects, such as equipment structure and operation, operation and maintenance workload, equipment investment, installed capacity, production running cost, plate scratch, etc. The results indicated that vacuum suction cups hanging conveyer device is with some advantages, such as simple structure, easy operation, low workload for operation and maintenance, small investment, small installed capacity, low production running cost, and production rhythm can completely meet the design requirements, which is the best optimization program for LASW pipe production line steel plate feeding device.%对JCOE/UOE直缝埋弧焊管生产线上通常采用的三种上料装置, 即平辊和链条组合输送装置、 链条输送装置以及真空吸盘吊输送装置的主要结构和组成进行了描述, 并从设备结构与操作、运行与维护工作量、 设备投资、 装机容量、 生产运行成本、 钢板划伤等主要方面进行了对比. 结果表明, 采用真空吸盘吊输送装置具有设备结构简单、 操作方便、 运行与维护的工作量相对较低、 资金投入相对较少、 装机容量小、 生产运行成本低、 生产节奏完全能满足设计要求等优点, 是直缝埋弧焊管生产线钢板上料的最佳优选方案.

  16. Cracking Analysis of Nuclear Class 316L Stainless Steel Pipe with Screwed Hole for Radiographic Test%核级316L不锈钢管道射线插塞孔开裂原因分析

    Institute of Scientific and Technical Information of China (English)

    薛长江; 洪源平; 戴恒才; 操丰; 方江; 丁有元

    2016-01-01

    In order to find out the reason of cracking on one nuclear class 316L stainless steel pipe with screwed hole for radiographic test , the analyses of macrostructure/microstructure ,chemical composition ,mechanical properties ,Vickers‐hardness ,mor‐phology of fracture ,corrosion products and stress distribution of the screwed hole on the cracking pipe were done .The results show that the crack propagates along the grain boundary and the material in the fracture exhibits a rock candy pattern and a large amount of corrosion products with polygonal crystals ,which indicates that the cause of failure is attributed to inter‐granular stress corrosion cracking (IGSCC ) induced by interaction of stagnant water of pressured water reactor and material .The main reason of strain‐hardening is the interference fit between the plug and screwed hole which suffering higher welding residual stress .More non‐destructive tests on the similar struc‐ture in the in‐service NPPs and less uses in new NPPs are strongly suggested .%为查明某核电厂核级316L奥氏体不锈钢管道射线插塞孔裂纹显示的成因,对含插塞孔不锈钢管段的宏/微观形貌、化学成分、力学性能、维氏硬度、断口形貌、腐蚀产物、应力分布等进行了分析。结果表明:裂纹以沿晶方式扩展,断口呈冰糖块脆性断裂花样并伴有大量氧化腐蚀产物,属于典型的压水堆一回路水介质条件下由插塞孔局部应变‐硬化导致的晶间应力腐蚀开裂。引起应变‐硬化的主要原因是插塞孔和插塞的过盈配合以及射线插塞孔密封焊缝焊接残余应力过高。建议加强在役机组同类结构的检查,减少新建机组类似结构的使用。

  17. Automatic guided wave communication system using steel pipes as communication channel for flood detection in steel offshoreoilrigs; Sistema automatico de comunicacion de ondas guiadas para la deteccion de tubos de refuerzo inundados en plataformas petroleras costa fuera

    Energy Technology Data Exchange (ETDEWEB)

    Mijarez Cstro, Rito; Martinez Ramirez, Fernando [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2010-10-09

    An automatic guided wave Pulse Position Modulation (PPM) system, using steel tubes as communication channel, for detecting flooding in the hollow sub-sea structures of offshore oilrigs is presented. The system employs two smart piezoelectric based sensors and modulators and a demodulator based on a piezoelectric transducer, a Digital Signal Processor (DSP) and a microcontroller. Experiments performed in the laboratory, in a tubular steel heliport structure and the base of a deck of an oilrig under construction, have successfully distinguished automatically guided wave encoded information. [Spanish] Este articulo presenta un trabajo de investigacion en el cual se desarrolla un sistema automatico de comunicacion de ondas guiadas por modulacion por posicion de pulsos (PPM), orientado a la deteccion de miembros inundados en los tubos de refuerzo de las plataformas petroleras costa fuera. El sistema utiliza de manera novedosa tubos de acero como medio de comunicacion y emplea dos sensores/moduladores inteligentes compuestos de cristales piezoelectricos, electronica basada en un microcontrolador y baterias. La instrumentacion del demodulador consta de un transductor piezoelectrico de ultrasonido, un procesador digital de senales (DSP) y un microcontrolador, el cual lleva a cabo de manera automatica la deteccion de ondas guiadas. Los experimentos se realizaron en aire, en laboratorio, en una estructura tubular de acero del helipuerto y en la base de una plataforma bajo construccion.

  18. 1998 Annual Study Report. Standardization of methods for evaluating characteristics of high-strength, large-diameter steel pipes for superhigh-pressure natural gas pipelines; 1998 nendo seika hokokusho. Chokoatsu tennen gas pipeline yo kokyodo daikei kokan no tokusei hoho no hyojunka

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1999-03-01

    The pipelines for safely transmitting superhigh-pressure natural gas should have excellent characteristics. The steel pipe is required to have a sufficient toughness, more concretely Charpy impact-absorbing energy, to prevent propagating shear fracture characteristic of natural gas pipelines. Recently, the natural gas pipeline is increasingly required to have higher design pressures (15 Mpa or higher) and grade (X80 or higher). In order to develop the techniques for simulating crack propagation in the propagating shear fracture of natural gas pipe lines as part of the programs to cope with these trends, the 1998 efforts were directed to reviewing the research results obtained so far and analysis of the problems to be solved and tasks to be taken, based on which the analytical procedure for gas releasing phenomena during the fracture process was basically developed, the material characteristic data were collected by the laboratory scale toughness tests, and the preliminary tests with rupture disks were conducted to verify the above analytical procedure. These efforts have established the bases for evaluating the characteristics of high-strength, large-diameter steel pipes in the light of safety against fracture, and greatly advanced the program towards the final target of developing the international specification drafts for toughness. (NEDO)

  19. Effect of temperature and pipe material on biofilm formation and survival of Escherichia coli in used drinking water pipes

    DEFF Research Database (Denmark)

    Silhan, J.; Corfitzen, Charlotte B.; Albrechtsen, Hans-Jørgen

    2006-01-01

    Segments of used drinking water pipes of galvanised steel (GS), cross-linked polyethylene (PEX), copper pipes (Cu) or new medium-density polyethylene (PE) were investigated for the formation of biofilm and survival of E coli in biofilm and in the water phase. Pipes were filled with water and incu...... survived longer at both temperatures in the glass control bottles than in the drinking water pipes. Despite the obvious biofilm formation, E coli was not detected in the biofilm at any of the investigated surfaces.......Segments of used drinking water pipes of galvanised steel (GS), cross-linked polyethylene (PEX), copper pipes (Cu) or new medium-density polyethylene (PE) were investigated for the formation of biofilm and survival of E coli in biofilm and in the water phase. Pipes were filled with water...... confirmed the general trends observed by HPC. Higher temperature was seen to be an important factor reducing E coli survival in the water phase in drinking water pipes. At 1 VC E coli survived more than 4 d in GS and Cu pipes and 8 d in PE-pipes, but was not detected after 48 h at 35 degrees C. The E coli...

  20. Nonlinear vibration of corrugated shallow shells under Uniform load

    Institute of Scientific and Technical Information of China (English)

    YUAN Hong; LIU Ren-huai

    2007-01-01

    Based on the large deflection dynamic equations of axisymmetric shallow shells of revolution,the nonlinear forced vibration of a corrugated shallow shell under uniform load is investigated.The nonlinear partial differential equations of shallow shell are reduced to the nonlinear integral-differential equations by the method of Green's function. To solve the integral-differential equations,expansion method is used to obtain Green's function.Then the integral-differential equations are reduced to the form with degenerate core by expanding Green's function as series of characteristic function.Therefore,the integral-differential equations become nonlinear ordinary differential equations with regard to time. The amplitude-frequency response under harmonic for is obtained by considering single mode vibration.As a numerical example,forced vibration phenomena of shallow spherical shells with sinusoidal corrugation are studied.The obtained solutions are available for reference to design of corrugated shells

  1. A corrugated termination shock in pulsar wind nebulae?

    CERN Document Server

    Lemoine, M

    2016-01-01

    Successful phenomenological models of pulsar wind nebulae assume efficient dissipation of the Poynting flux of the magnetized electron-positron wind as well as efficient acceleration of the pairs in the vicinity of the termination shock, but how this is realized is not yet well understood. The present paper suggests that the corrugation of the termination shock, at the onset of non-linearity, may lead towards the desired phenomenology. Non-linear corrugation of the termination shock would convert a fraction of order unity of the incoming ordered magnetic field into downstream turbulence, slowing down the flow to sub-relativistic velocities. The dissipation of turbulence would further preheat the pair population on short length scales, close to equipartition with the magnetic field, thereby reducing the initial high magnetization to values of order unity. Furthermore, it is speculated that the turbulence generated by the corrugation pattern may sustain a relativistic Fermi process, accelerating particles close...

  2. MONITORING OF TRACK SECTIONS WITH LONG-PITCH CORRUGATION

    Directory of Open Access Journals (Sweden)

    Jan Valehrach

    2016-09-01

    Full Text Available The focus of this paper lies on monitoring of the track sections with rail corrugations caused by wheel sliding. Short waves on the running surface of the rail head on low rail are typical for this defect. Long-pitch corrugation is a significant cause of vibration and noise pollution in the railway infrastructure. Therefore it is very important to understand the formation and development of this imperfection of the rails. Measurements were carried out in curves of small radii on several tracks in the Czech Republic. In addition to the measurement of the surface of the rail head a number of supplementary parameters was evaluated for each section, such as curve radius, superelevation, track gauge etc. and the speed of passing trains as well. This paper describes rail corrugation defect and its development. Our early results are presented in the Conclusions.

  3. Experimental investigation of heat transfer and friction factor in a corrugated plate heat exchanger

    National Research Council Canada - National Science Library

    Shive Dayal Pandey, V.K. Nema

    2011-01-01

    Experiments are conducted to determine the heat transfer characteristics for fully developed flow of air and water flowing in alternate corrugated ducts with an inter-wall spacing equal to the corrugation height...

  4. CENTRIFUGAL MODEL TEST OF SLOPE REINFORCED BY SMALL-DIAMETER STEEL PIPE ROW PILES%小直径钢管排桩加固边坡的离心模型试验

    Institute of Scientific and Technical Information of China (English)

    向波; 马建林; 何云勇; 朱林; 张正义

    2012-01-01

    As a new retaining structure, the small-diameter steel pipe anti-sliding pile is used extensively for slope reinforcement and landslide control, but its some behaviors, such as anti-sliding characteristics, force mechanism and failure mode, etc., need to be further studied. Combining with a specific engineering, centrifugal model tests of small- diameter steel pipe row piles are used to investigate the effects of slope failure mode, stress condition, pile spacing and connection beams on slope anti-sliding capacity. The results show that the model slope in each group suffers overall structure failure, and sliding surface can be observed clearly only in slopes without reinforcement. The anti-sliding mechanism of this kind of structures represents the geological improvement by high-pressure grouting and cooperative anti-sliding activity by piles and rock-soil composite structure. The main failure mode of this kind of structure is overall instability caused by axial tension and compression. The anti-sliding capacity of row piles is affected dramatically by pile spacing. The relationship between the ratio of pile spacing to pile diameter(L/φ) and factor of safety of slope is apower function, and the value of L/φ of this type of row piles is recommended to be 6 - 12. Soil pressures behind piles increase with the increasing depth first and then decrease, and they approximately present a triangular distribution above the sliding surface. For the triple-row pile structure with connection beams, the bearing capacity of pile B decreases with the increase of acceleration, while that of pile C is on the contrary. The factor of safety of slope increases by 38.3% under the action of connection beams.%小直径钢管抗滑桩作为一种新型支挡结构广泛应用于边坡加固和滑坡治理中,但其抗滑特性、受力机制及破坏模式等还有待于深入研究.结合工程背景,开展小直径钢管排桩离心模型试验,研究排桩加固边坡破坏模式、

  5. Heat pipes

    CERN Document Server

    Dunn, Peter D

    1982-01-01

    A comprehensive, up-to-date coverage of the theory, design and manufacture of heat pipes and their applications. This latest edition has been thoroughly revised, up-dated and expanded to give an in-depth coverage of the new developments in the field. Significant new material has been added to all the chapters and the applications section has been totally rewritten to ensure that topical and important applications are appropriately emphasised. The bibliography has been considerably enlarged to incorporate much valuable new information. Thus readers of the previous edition, which has established

  6. Numerical modeling of manufacturing process of corrugated plate

    Directory of Open Access Journals (Sweden)

    Khodos Ol'ga Aleksandrovna

    2014-09-01

    Full Text Available The rigidity increase of structures consisting of plates and shells is a relevant task. One way to obtain plates with enhanced stiffness performance is the corrugation, i.e. change of its topography elevation. Depending on the method, corrugation provides a plate with additional rigidity in one or several directions without weight gain. The most common way to get corrugated plates is pressure forming. The problem of finding the most energy saving method is very relevant. In this regard, a possible approach is to use buckling of thin cylinder. The idea of this technique comes from the fact that as a result of stability loss of cylindrical shell in compression along its elements, the cylinder walls are deformed periodically. The article considers the problem of corrugated plates manufacturing using smooth sheet metal. The method of manufacture is based on irreversible process of cylindrical buckling of a shell previously obtained from a worksheet. Such a deformation process may be useful if the energy spent on its implementation is smaller than the energy in standard process of forming. The task of defining the stiffness of a corrugated plate is quite difficult because it is difficult to experimentally measure the tension, bending and coupled stiffness. The numerical simulation of three ways to manufacture corrugated cylindrical shell made of smooth sheet by elastic-plastic deformation process are offered: the first way is to deform the cylindrical shell under the action of axial load on the butt end, and the second way is the influence of strutting internal pressure. In the third way the cylindrical shell is made of the leaf using the special techniques. In order to compare the effectiveness of the options presented for each case the internal energy is calculated. It is shown that the energy expenditure in buckling method is the smallest.

  7. 夹杂物对油井管钢氢致开裂腐蚀的影响%Influence of Inclusions on Hydrogen Induced Cracking of Oil Well Pipe Steel

    Institute of Scientific and Technical Information of China (English)

    艾芳芳; 徐小连; 陈义庆; 钟彬; 李琳; 高鹏; 解德刚

    2012-01-01

    对油井管钢进行了pH 2.0溶液浸泡的氢致开裂(HIC)试验。考察了油井管钢的抗HIC性能,分析了不同种类夹杂物对钢板HIC性能的影响。结果表明,在强酸性腐蚀环境中,夹杂物越多,钢对HIC越敏感。诱发油井管钢氢致开裂的夹杂物主要为MnS夹杂物、Al2O3夹杂物和硅铝酸盐复合夹杂物,其中长条状MnS夹杂物危害最大。夹杂物诱发裂纹的初期形貌为夹杂周围出现空洞,空洞的扩展成为氢致裂纹。%Hydrogen induced cracking(HIC) tests in pH 2.0 corrosion solutions and inclusion analysis of oil well pipe steels were carried out.The mechanism of inclusion influence was discussed.The results showed that HIC sensitivity of the sample with more inclusions was the biggest in strong acidic solution.The inclusions which induced HIC were MnS inclusion,Al2O3 inclusion and SiO2-Al2O3 inclusion.Among the three kinds of inclusions,the strip-shaped MnS inclusion had the greatest harmfulness.The initial patter of HIC caused by inclusions was cavities around inclusions,and then cavities developed into cracks.

  8. 大直径微型钢管桩桩基托换技术在地铁施工中的应用%Application of Large-diameter Micro Steel Pipe Pile Underpinning Technology in Construction of Metro Works

    Institute of Scientific and Technical Information of China (English)

    谢永盛

    2012-01-01

    广州地铁二、八号线延长线洛溪站—南洲站盾构区间从彩虹花园密集桩群中通过,大量桩基侵入盾构掘进区域,需对彩虹花园进行加固处理,但加固施工空间狭小。为了解决彩虹花园加固处理难题,采用350 mm大直径微型钢管桩进行桩基托换,盾构到达原桩位置时采取停机截桩方案进行加固处理。加固过程中建筑物沉降稳定,未出现任何裂缝,结构完好,达到预期加固效果,可供相似工程进行参考。%Luoxi stationNanzhou station shield tunneling section on the extended section of No. 2 and No. 8 line of Guangzhou Metro passes through the pile group of Caihong Garden. Many piles intrude into the clearance of the shield bored tunnel, therefore Caihong Garden should be reinforced. Furthermore, the operation space for the reinforcement is small. Micro steel pipe piles with 350 mm diameter are adopted to underpin the pile foundation. When the shield arrives at the position of the existing piles, the piles are cut and reinforcement is made. During the reinforcement, the settle ment of the buildings is stable and expected reinforcement effect is achieved.

  9. Research on PLC controlling system for high strength plastics-steel composite pipe based on DC resistance welding%基于直流电阻焊的高强度钢塑管道PLC控制系统

    Institute of Scientific and Technical Information of China (English)

    廖继明; 熊健; 杨继文; 姜正

    2011-01-01

    This paper designed and realized high strength plastics-steel composite PLC controlling system with the precision of 0.001 s, utilizing the principle of mid-frequency inverter resistance welding,in accordance with the problems that composite pipe produced by AC resistance welding can't meet the application in high-quality project in face of the increasingly stringent technological and environmental indexes.The strength of welding point enhanced about 20 kg and the capability of anti-extrusion improved approximately 3.0 Mpa in contrast with AC welding.The experimental results indicated that the system in the abominable electromagnetic environment is reliable,strongly universal,accurate control and convenient operation.%针对日益严格的技术、环境指标和交流焊接生产的管道无法应用于高品质工程的问题,利用中频逆变直流电阻焊原理,设计并实现了控制精度为0.001 s的高强度钢塑复合管道PLC控制系统.经过系统组态、焊接电路的设计和改进,与交流电阻焊相比较,直流焊焊点强度提高约20 kg,抗挤压能力提高约3.0 MPa.试验结果表明,通过采取抗干扰措施,系统运行稳定可靠、通用性强、控制精确、操作方便.

  10. Finite-element analysis of flawed and unflawed pipe tests

    Energy Technology Data Exchange (ETDEWEB)

    James, R.J.; Nickell, R.E.; Sullaway, M.F. (ANATECH Research Corp., La Jolla, CA (USA))

    1989-12-01

    Contemporary versions of the general purpose, nonlinear finite element program ABAQUS have been used in structural response verification exercises on flawed and unflawed austenitic stainless steel and ferritic steel piping. Among the topics examined, through comparison between ABAQUS calculations and test results, were: (1) the effect of using variations in the stress-strain relationship from the test article material on the calculated response; (2) the convergence properties of various finite element representations of the pipe geometry, using shell, beam and continuum models; (3) the effect of test system compliance; and (4) the validity of ABAQUS J-integral routines for flawed pipe evaluations. The study was culminated by the development and demonstration of a macroelement'' representation for the flawed pipe section. The macroelement can be inserted into an existing piping system model, in order to accurately treat the crack-opening and crack-closing static and dynamic response. 11 refs., 20 figs., 1 tab.

  11. Analytical Evaluation of Fibre-Reinforced Plastic Corrugated Sheet

    Directory of Open Access Journals (Sweden)

    C. K. Gautam

    1998-01-01

    Full Text Available Fibre-reinforced' composites playa lead role as advanced materials in modem day structures.This paper reports fabrication and testing offibre-reinforced corrugated sheet employing 4-point bend loading. An in-depth analysis has been carried out using ANSYS, a finite element method package.The theoretical results obtained are compared with the experimental values. The values ofboth inputsshowed similar results. conforming at a particular boundary condition. However, more similarexperiments "on such fibre-reinforced plastic corrugated sheets have been suggested for -better comparison.

  12. Corrugated capillary as THz Cherenkov Smith-Purcell radiator

    Science.gov (United States)

    Lekomtsev, K. V.; Aryshev, A. S.; Tishchenko, A. A.; Ponomarenko, A. A.; Sukharev, V. M.; Terunuma, N.; Urakawa, J.; Strikhanov, M. N.

    2016-07-01

    In this article we discussed Particle In Cell electromagnetic simulations and mechanical design of dielectric capillaries that produce THz Cherenkov Smith-Purcell radiation (ChSPR), arising when a femtosecond electron multi-bunch beam propagates through corrugated and non-corrugated dielectric capillaries with metallic radiation reflectors. We investigated the influence of the four-bunch beam on the SPR field spectrum and on the ChSPR power spectrum, and the influence of the non-central beam propagation on the ChSPR power spectrum. We also discussed the design and assembly of the capillaries, constructed as sets of cylindrical rings.

  13. 管汇材料35 CrMo钢冲蚀磨损性能研究∗%Erosion-wear Property of the 35CrMo Steel for Manifold Pipe Material

    Institute of Scientific and Technical Information of China (English)

    孟杏; 樊建春; 刘书杰; 杨向前; 刘藩琪; 冯桓榰; 代濠源

    2016-01-01

    35CrMo材料作为常用的管汇材料,研究其冲蚀磨损性能对于保证钻井作业安全十分重要。采用自主研发的冲蚀磨损试验机在压力105 MPa、介质冲击速率30 m/s的条件下,对35CrMo材料制作的试样进行了冲击磨损试验,分析了冲击角度、冲蚀介质和冲击时间对冲蚀磨损量的影响。分析结果表明:35CrMo合金钢的最大冲蚀量出现在冲击角度为30°~45°时,冲击角度较小时,微切削起主要作用,随着角度的增大,锻造作用造成的塑性变形机制引起磨损加重;陶粒支撑剂对材料的冲蚀磨损远大于覆膜砂,并且随着冲蚀介质支撑剂粒径的增大,材料的磨损量也增加;在试验设定的时间段内,随着冲蚀时间的延长,冲蚀磨损量几乎呈线性增加。所得结论对预估材料的冲蚀磨损剩余寿命有一定的参考作用。%Study on the erosion wear properties of 35CrMo steel, commonly used as a manifold pipe material, is critical for ensuring drilling safety. The samples made by the 35CrMo steel have been conducted impact wear tes⁃tat the pressure of 105 MPa and medium impact velocity of 30 m/s using self⁃developed erosion test machine, and the effect of the impact angle, erosion medium and impact time on the erosion loss has been analyzed. The results show that the maximum erosion loss of 35CrMo alloy steel occurs at the impact angle of 30°~45°. The micro⁃cutting plays a major roleon the erosion loss at small impact angle. With the increase of the impact angle, the plastic de⁃formation mechanism caused by forging increase the wear loss. The ceramic proppant material has a much greater⁃erosion wear performance than the coated sand. The erosion loss increases with the proppant particle size. Within the period of test time, with the extension of erosion time, the erosion loss increased almost linearly. The conclu⁃sion could provide some reference for estimating the erosion

  14. Study of fatigue behavior of longitudinal welded pipes

    Science.gov (United States)

    Simion, P.; Dia, V.; Istrate, B.; Hrituleac, G.; Hrituleac, I.; Munteanu, C.

    2016-08-01

    During transport and storage of the various fluids, welded pipes are subjected to cyclic loading due to pressure fluctuations that often exceed the prescribed values for normal operation. These cyclic loading can significantly reduce the life of the pipes; as a result the design should be based on the fatigue strength not only on static resistance. In general the fatigue strength of pipes is dependent by strength, pipe geometry and surface quality. In case of the electric longitudinal welded pipes, the fatigue strength is significantly limited by concentration of residual stress and the size of existing defects in the weld seam. This paper presents the fatigue behaviour of the electric welded pipes by high frequency, under conditions that simulate real operating conditions pipes. Fatigue testing was performed on welded pipes made of micro alloyed carbon steels. Some of these pipes were previously subjected to a heat treatment of normalization, in order to also determine the influence of heat treatment on the fatigue strength of welded pipes. To determine and correlate the different factors affecting the fatigue strength, welded pipes were also subjected to various tests: tensile tests, impact tests, measurement of micro hardness, microstructural analysis by optical microscopy and scanning electron microscopy.

  15. Predictions for fatigue crack growth life of cracked pipes and pipe welds using RMS SIF approach and experimental validation

    Energy Technology Data Exchange (ETDEWEB)

    Arora, Punit, E-mail: punit@barc.gov.in [Bhabha Atomic Research Centre, Department of Atomic Energy, Maharashtra, Mumbai 400 085 (India); Singh, P.K.; Bhasin, Vivek; Vaze, K.K.; Ghosh, A.K. [Bhabha Atomic Research Centre, Department of Atomic Energy, Maharashtra, Mumbai 400 085 (India); Pukazhendhi, D.M.; Gandhi, P.; Raghava, G. [Structural Engineering Research Centre, Chennai 600 113 (India)

    2011-10-15

    The objective of the present study is to understand the fatigue crack growth behavior in austenitic stainless steel pipes and pipe welds by carrying out analysis/predictions and experiments. The Paris law has been used for the prediction of fatigue crack growth life. To carry out the analysis, Paris constants have been determined for pipe (base) and pipe weld materials by using Compact Tension (CT) specimens machined from the actual pipe/pipe weld. Analyses have been carried out to predict the fatigue crack growth life of the austenitic stainless steel pipes/pipes welds having part through cracks on the outer surface. In the analyses, Stress Intensity Factors (K) have been evaluated through two different schemes. The first scheme considers the 'K' evaluations at two points of the crack front i.e. maximum crack depth and crack tip at the outer surface. The second scheme accounts for the area averaged root mean square stress intensity factor (K{sub RMS}) at deepest and surface points. Crack growth and the crack shape with loading cycles have been evaluated. In order to validate the analytical procedure/results, experiments have been carried out on full scale pipe and pipe welds with part through circumferential crack. Fatigue crack growth life evaluated using both schemes have been compared with experimental results. Use of stress intensity factor (K{sub RMS}) evaluated using second scheme gives better fatigue crack growth life prediction compared to that of first scheme. Fatigue crack growth in pipe weld (Gas Tungsten Arc Welding) can be predicted well using Paris constants of base material but prediction is non-conservative for pipe weld (Shielded Metal Arc Welding). Further, predictions using fatigue crack growth rate curve of ASME produces conservative results for pipe and GTAW pipe welds and comparable results for SMAW pipe welds. - Highlights: > Predicting fatigue crack growth of Austenitic Stainless Steel pipes and pipe welds. > Use of RMS-SIF and

  16. A corrugated termination shock in pulsar wind nebulae?

    Science.gov (United States)

    Lemoine, Martin

    2016-08-01

    Successful phenomenological models of pulsar wind nebulae assume efficient dissipation of the Poynting flux of the magnetized electron-positron wind as well as efficient acceleration of the pairs in the vicinity of the termination shock, but how this is realized is not yet well understood. This paper suggests that the corrugation of the termination shock, at the onset of nonlinearity, may lead towards the desired phenomenology. Nonlinear corrugation of the termination shock would convert a fraction of order unity of the incoming ordered magnetic field into downstream turbulence, slowing down the flow to sub-relativistic velocities. The dissipation of turbulence would further preheat the pair population on short length scales, close to equipartition with the magnetic field, thereby reducing the initial high magnetization to values of order unity. Furthermore, it is speculated that the turbulence generated by the corrugation pattern may sustain a relativistic Fermi process, accelerating particles close to the radiation reaction limit, as observed in the Crab nebula. The required corrugation could be induced by the fast magnetosonic modes of downstream nebular turbulence; but it could also be produced by upstream turbulence, either carried by the wind or seeded in the precursor by the accelerated particles themselves.

  17. Molecule scattering from solid surfaces : Orientation and surface corrugation effects

    NARCIS (Netherlands)

    Vicanek, M; Schlatholter, T; Heiland, W

    1997-01-01

    Various effects connected with orientation and surface corrugation in molecule scattering from solid surfaces are investigated by means of classical trajectories simulations for H-2 impinging on Pd(110). Primary excitation of the projectiles is modeled according to the situation in molecular beam ex

  18. First ERW Ф610 Steel Tube Production Line Brought on Stream

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    @@ The first domestic ERWФ610 high-frequency straight-seam steel pipe production line was built in Shanghai Zhongyou TIPO Steel Pipe Co Ltd recently.This steel pipe production line initiated inside China has drawn the attention from many enterprises including PetroChina and CNOOC. It is known that the first batch of products have been transported to the construction site of the West -East Gas Transmission Project.

  19. Leading- and next-to-leading-order lateral Casimir force on corrugated surfaces

    CERN Document Server

    Cavero-Pelaez, Ines; Parashar, Prachi; Shajesh, K V

    2008-01-01

    We derive explicit analytic expressions for the lateral force for two different configurations with corrugations, parallel plates and concentric cylinders. By making use of the multiple scattering formalism, we calculate the force for a scalar field under the influence of a delta-function potential that has sinusoidal dependence in one direction simulating the corrugations. By making a perturbative expansion in the amplitude of the corrugation we find the leading order for the corrugated concentric cylinders and the next-to-leading order for the corrugated parallel plates.

  20. SIMULATION AND ANALYSIS OF FLOW PATTERN IN CROSS-CORRUGATED PLATE HEAT EXCHANGERS

    Institute of Scientific and Technical Information of China (English)

    ZHANG Guan-min; TIAN Mao-cheng; ZHOU Shou-jun

    2006-01-01

    Using numerical methodology, the flow fields between two corrugated plates with different values of the corrugation inclination angle β were simulated.The simulation results directly indicate that β affects the flow pattern between corrugated plates, and the results are in good agreement with the experimental results reported by interrelated literature.The results show that the flow pattern between the two plates changes from "double cross-flow" to "zigzag flow" with the increase in β.The reason for the effect on the flow pattern between the two corrugated plates was discussed from the view of the variation of momentum in the direction of corrugation with the variation in β.

  1. Fundamentals of piping design

    CERN Document Server

    Smith, Peter

    2013-01-01

    Written for the piping engineer and designer in the field, this two-part series helps to fill a void in piping literature,since the Rip Weaver books of the '90s were taken out of print at the advent of the Computer Aid Design(CAD) era. Technology may have changed, however the fundamentals of piping rules still apply in the digitalrepresentation of process piping systems. The Fundamentals of Piping Design is an introduction to the designof piping systems, various processes and the layout of pipe work connecting the major items of equipment forthe new hire, the engineering student and the vetera

  2. In-Orbit Construction with a Helical Seam Pipe Mill

    Science.gov (United States)

    Gilhooley, N.

    The challenges of building large structures in space, and in particular a torus habitat, require novel processes. One potential method is to manufacture helical seam (also called spiral) pipe in orbit using a pipe mill. These machines turn rolls of steel or alloy into fully formed, welded and inspected pipe, pressure vessels and silos of various diameters. Pipe mills are highly automated and efficient in a factory environment and are increasingly being used for in-situ repair. By constructing in-orbit (on-orbit assembly) the launch vehicle can supply full payloads of compact, robust rolls of material; and the installation design is less restricted by fairing constraints and modular limitations. The use of a pipe mill is discussed as a possible construction method, for comparison an example design envelope is shown and further pipe mill products are considered.

  3. Characterizing the Performance of Pipe Bombs.

    Science.gov (United States)

    Oxley, Jimmie C; Smith, James L; Bernier, Evan T; Sandstrom, Fredrick; Weiss, Gregory G; Recht, Gunther W; Schatzer, David

    2017-05-24

    Pipe bombs of steel or PVC fragment in reproducible patterns when similarly configured. The power of the explosion correlates with number, mass, and size of the fragments recovered, where a large number of small, low-mass fragments indicate a high-power event and vice versa. In discussing performance, describing pipe fragmentation pattern by fragment weight distribution mapping (FWDM) or fragment surface area distribution mapping (FSADM) was useful. When fillers detonated, detonation velocities of ~4.4 mm/μs were measured. In such cases, side walls of the pipe were thrown first; the average fragment velocity was ~1000 km/s. In deflagrations, the end cap was first thrown; fragment velocities were only ~240 km/s. Blast overpressures varied; at 10 feet, 2 × 12 inch steel pipes containing ~550 g of detonable mixture produced overpressures of 5-6 psi; similar nondetonating pipes produced less than 2 psi. Maximum fragment throw distances were 250-300 m, with an average of ~100 m. © 2017 American Academy of Forensic Sciences.

  4. Condensation of refrigerants flowing inside smooth and corrugated tubes

    Energy Technology Data Exchange (ETDEWEB)

    Hinton, D.L. [Tennessee State Univ., Nashville, TN (United States); Conklin, J.C.; Vineyard, E.A. [Oak Ridge National Lab., TN (United States)

    1995-07-01

    Because heat exchanger thermal performance has a direct fluence on the overall cycle performance of vapor-compression refrigeration machinery,enhanced heat transfer surfaces are of interest to improve the efficiency of heat pumps and air conditioners. We investigated R-22 and a nonazeotropic refrigerant mixture (NARM) of 75% R-143a and 25% R-124 (by mass) to study their thermal performance in a condenser made of conventional smooth tubes and another condenser made of corrugated, or spirally indented, tubes. We investigated the condensing heat transfer and pressure drop characteristics in an experimental test loop model of a domestic beat pump system employing a variable speed compressor. The refrigerant circulates inside the central tube and the water circulates in the annulus. At refrigerant mass fluxes of approximately 275--300 kg/m{sup 2}s, the measured irreversible pressure drop of the corrugated surface was 23% higher than that of the smooth surface for the R-22. At refrigerant mass fluxes of 350-370 kg/m{sup 2}s, the irreversible pressure drop of the corrugated surface was 36% higher than that of the smooth surface for the NARM. The average heat transfer coefficient for the corrugated surface for R-22 was roughly 40% higher than that for the smooth tube surface at refrigerant mass fluxes of 275--295 kg/m{sup 2}s. The average heat transfer coefficient for the corrugated surface for the NARM was typically 70% higher than that for the smooth tube surface at refrigerant mass fluxes of 340--385 kg/m{sup 2}s.

  5. Casing free district heating pipes; Mantelfria fjaerrvaermeroer

    Energy Technology Data Exchange (ETDEWEB)

    Saellberg, Sven-Erik; Nilsson, Stefan [Swedish National Testing and Research Inst., Goeteborg (Sweden)

    2005-07-01

    Previous studies have shown that polyurethane insulation (PUR foam) on district heating pipes acts as protection against water if it is of good quality, i.e. free from cracks, cavities and other defects. On the other hand water vapour easily diffuses through PUR foam. However this is not a problem as long as the steel pipe is warmer than the surface layer, since the high temperature will prevent the vapour from condensating. What will happen with the insulation of a casing free district heating pipe where the ground water level occasionally reaches above the pipe has not been studied in detail. The current project has studied to what extent moisture enters the PUR foam insulation of two approximately one meter long district heating pipes without casing which have been in the ground for four years. Occasionally, the ground-water has entirely covered the pipes. In addition, the foam has been studied with respect to damage from the surrounding backfill material. Test specimens were taken out of the casing free pipes and were analysed with respect to moisture content. Additional measurements were done with a moisture indicator, and the electric resistance between the steel pipes and the four surveillance wires in each pipe was measured. The results from the various measurement techniques were the compared. The results show that the PUR foam remains dry as long as the service pipe is hot if no defects, such as crack and cavities, are present. Close to the service pipe, the foam actually dries out over time. The moisture content of the middle layer remains more or less constant. Only the colder parts on the outside exhibit an increase in moisture content. It was also seen that defects may lead to water ingress with subsequent humidification of the foam. However, the damaged foam area is limited. This is not the case for a regular pipe with a vapour tight casing, where experience show that moisture tend to spread along the pipe. The pipes were buried in sand and no

  6. 临沂机场航站楼钢管桁架施工技术%CONSTRUCTION TECHNIQUE FOR PIPE TRUSS OF LINYI AIRPORT TERMINAL BUILDING

    Institute of Scientific and Technical Information of China (English)

    李太权; 苏建成; 邱国峰

    2012-01-01

    临沂机场新航站楼结构形式为平面钢管桁架,通过大跨度平面钢管桁架中相贯线切割小、钢管冷弯控制和桁架组拼完成了钢管构件加工.通过方案比选,采用了设置临时支架、起重机换位吊装法,保证了吊装质量及进度.%New terminal building of Linyi Airport adopts plane steel pipe truss structure and the process of steel pipe component is successfully completed through intersecting line cutting in wide-span plane steel pipe truss, cold bending control of steel pipe and truss assembly. After comparison and selection among different schemes, temporary support and crane transposition lifting are adopted to guarantee the lifting quality and construction schedule.New terminal building of Linyi Airport adopts plane steel pipe truss structure and the process of steel pipe component is successfully completed through intersecting line cutting in wide-span plane steel pipe truss, cold bending control of steel pipe and truss assembly. After comparison and selection among different schemes, temporary support and crane transposition lifting are adopted to guarantee the lifting quality and construction schedule.New terminal building of Linyi Airport adopts plane steel pipe truss structure and the process of steel pipe component is successfully completed through intersecting line cutting in wide-span plane steel pipe truss, cold bending control of steel pipe and truss assembly. After comparison and selection among different schemes, temporary support and crane transposition lifting are adopted to guarantee the lifting quality and construction schedule.

  7. [Study on pipe material's influence on chlorine dioxide drinking water disinfection].

    Science.gov (United States)

    He, Tao; Yue, Yinling; Ling, Bo; Zhang, Lan

    2010-09-01

    To study the pipe material's influence on chlorine dioxide drinking water disinfection. 0.8 mg/L chlorine dioxide solution was injected into 5 kinds of pipes respectively, PPR, PVC-U, Steel with Zinc coating, copper and PE pipes. Dipped free from light for 48 hours and the concentrations of chlorine dioxide, chlorite and chlorate were tested from samples taken from each kind of pipe at 1, 2, 3, 4, 5, 6, 12, 24 and 48 hours respectively. Chlorine dioxides decay rates in the water dipping the pipes increase as the dipping time increases and the decay of chlorine dioxide mainly occurs within 6 hours after the dipping. But for different pipe, the influence of decay differs. The consumption of chlorine dioxide of the metal pipes is more than that of the plastic pipes. And with 2 hours after the dipping experiment begins, the concentrations of the chlorite of the copper pipe and of the steel with zinc coating pipe increase quickly and reach the maximum concentration. But then the chlorite concentration decreases greatly. After dipped 24 hours, the chlorite in the water in the pipe can not be detected. For other plastic piples, all the chlorite concentrations in the dipping water increase as the dipping time increase. Compared with the start of the dipping experiment, the chlorate concentration in the dipping water of each pipe has no obvious change. The material of the water transportation pipe does have influence on chlorine dioxide drinking water disinfection.

  8. On the Fully-Developed Heat Transfer Enhancing Flow Field in Sinusoidally, Spirally Corrugated Tubes Using Computational Fluid Dynamics

    DEFF Research Database (Denmark)

    Hærvig, Jakob; Sørensen, Kim; Condra, Thomas Joseph

    2017-01-01

    A numerical study has been carried out to investigate heat transfer enhancing flow field in 28 geometrically different sinusoidally, spirally corrugated tubes. To vary the corrugation, the height of corrugation e/De/D and the length between two successive corrugated sections p/Dp/D are varied in ...

  9. Study on Varying Metallic Properties of Straight and Elbow Pipes of Main Steam Piping after Long-Time Service

    Institute of Scientific and Technical Information of China (English)

    Shen Hongsheng; Lin Zhongyuan; Duan Xuzhen

    2005-01-01

    The mechanic properties, lasting strength and microstructural properties of straight and elbow pipesof 12CrMo, 10CrMo910 and 12CrlMoV low alloy steel main steam piping system after long-time service weretested and studied. The testing results showed that, for straight and elbow pipes of mainsteam piping under theconditions of high temperature and high pressure, the numerical operating performance indexes of their metalchanged with little difference, generally both within 5%, and the Values of elbow were higher than those ofstraight pipes. These phenomena proved that the aging processes of pipe metal at different positions are thesame. And the cause for higher numerical performance indexes of elbow and higher failure rate at elbow posi-tion during operation of steam pipes were investigated.

  10. 敏感海域大直径钢管沉桩施工环保措施研究*%Research on Environmental Protection Measures in Construction of Steel Pipe Pile Driving with Large Diameter in Sensitive Sea Areas

    Institute of Scientific and Technical Information of China (English)

    谭昱; 陈儒发; 谭逸波

    2014-01-01

    To weaken the adverse effects of the pile foundation construction for marine engineering on the marine environment, this paper analyzes environmental sensitivity in construction of steel pipe pile driving for large-diameter and deep-long pile foundation. The special noise reduction device, that is air curtain generator, which has been designed in the experiment. To study noise reduction effect of the bubble curtain in the process of pile driving;simultaneously, comparative analysis the strength of the impact on the environment of the different pile driving formation. The results shows that attenuation of the noise peak sound pressure up to 24% to 74% when the air curtain generator is turned on. The noise peak sound pressure generated by impact pile driving is significantly greater than by vibratory pile driving. The noise of impact pile driving has a higher energy distribution in a certain frequency range.%为减弱海洋工程桩基础施工对海域环境造成的不良影响,开展大直径深长桩基础钢管沉桩施工的环境敏感性研究,本试验设计特制的减噪装置为气幕发生器,以研究沉桩过程中气泡帷幕的减噪效果;同时,对比分析了不同沉桩形成对环境影响的强弱。结果表明:钢管沉桩时开启气幕发生器,噪声峰值声压衰减量可达24%~74%;撞击沉桩产生的噪声峰值声压明显大于振动沉桩所产生的噪声峰值声压,撞击沉桩噪声在一定的频带范围内有较高的能量分布。

  11. KEMAMPUAN GENTENG PLASTIK BERGELOMBANG (CORRUGATED PLASTIC SEBAGAI BIOFILTER PARTIKEL AMONIAK DAN BAHAN ORGANIK DI MEDIA BUDIDAYA DAN LIMBAH CAIR BUDIDAYA IKAN (Performance of Corrugated Plastic as Biofilter of Ammonia Particle and Organic Material

    Directory of Open Access Journals (Sweden)

    Muslim Muslim

    2010-07-01

    Sediment (TSS, Suspended Sediment (SS, ammonia and organic matter (COD. The result of the study showed that corrugated plastic effectively reduced TSS, SS, ammonia and COD both within rearing tank and in the outside of rearing tank with removal efficiency: 74.51% and 54.42% (TSS; 39.20% and 49.12% (SS; 19.82% and 14.2% (ammonia; and 24.82% and 22.47% (COD. When corrugated plastic is compared with other materials such as plastic rolls, scrub pads, PVC pipes etc, it is shown that corrugated plastic performed significantly higher removal rate (g/m3/d and specific removal rate (mg/m2/d to ammonia.

  12. 包钢薄板坯连轧主厂房设计%DESIGN OF MAIN BUILDING FOR THE BAR STRIP CONTINUOUS ROLLING MILL IN BAOTOU IRON AND STEEL COMPANY

    Institute of Scientific and Technical Information of China (English)

    田丰; 苏驭虎

    2001-01-01

    连轧主厂房为单层厂房,下柱为钢管混凝土双肢柱,上柱为焊接工字型柱,屋面大梁为焊接工字钢梁.基本柱距12m.设有80/20t吊车3台.厂房内设有7架精轧机及配套的设备基础,地下结构复杂,深迭8m.地面荷载为100kPa,屋面及墙面均采用保温压型钢板.同时,檩条节点做了技术改进.%The main building for the continuous rolling mill is aone-storied factory building. The bottom parts of the columns are steel-pipe concrete battened column. The top parts of the columns are welding Ⅰ-column. The roof beams are welding Ⅰ-steel beam. Columns space basically at 12m. Three cranes (each has a capacity of 80/20t) and 7 finishing mills with matching equipment foundations are equipped inside. There is a complexity in the sub-structure. The depth reaches as 8m. The ground loading is 100kPa. The corrugated sheet steel is used for the wall cladding system and the roof. Certain improvements have been made under the connection points of the purlins.

  13. Profile Design and 3D Flow Field Simulation of Steel Bifurcation Pipe in the CCS Hydropower Station in Ecuador%厄瓜多尔 CCS 水电站钢岔管体形设计与三维流场分析

    Institute of Scientific and Technical Information of China (English)

    王春; 陈丽晔; 伍鹤皋; 程永光

    2015-01-01

    厄瓜多尔CCS水电站钢岔管设计内水压力6.83 MPa,HD值高达4084 m2。采用美国ASME标准并选用日本钢材对此进行了设计。在岔管体型初步设计的基础上,建立了岔管三维有限元数值模型,对岔管进行了结构分析,并对典型工况下的岔管水力学情况进行数值模拟,根据计算结果提出对岔管体形和机组运行的优化建议。%The steel bifurcation pipe with a design internal water pressure of 6.83 MPa and HD value of 4084 m2 in the CCS Hydropower Station Project in Ecuador is designed according to the American standard ASME 79, and the Japanese steel material is adopted.Based on the preliminary design of bifurcation profile, a three-dimensional finite element mod-el of the bifurcation pipe is built and a structure analysis is carried out.In addition, numerical simulations of the typical hydraulic conditions are performed.Accordingly, optimization suggestions on the profile design and operation of units are proposed.

  14. 基于FLAC3D的超长大直径钢管桩竖向承载特性模拟%Simulation of vertical bearing features for large-diameter and super-long steel pipe pile based on FLAC3D

    Institute of Scientific and Technical Information of China (English)

    张明远; 黎生南; 彭文韬; 宋华珠

    2011-01-01

    More and more large-diameter and super-long steel pipe piles are applied to engineering in recent years. But so far , few people have focused on studing their bearing characteristics. Computational theory of ordinary piles is referenced in the foundation design. Vertical bearing and settlement features are simulated for large-diameter and super-long steel pipe piles based on the fast Lagrangian analysis of continua in three dimensions (FLAC3D). Then comparison between simulation results and the results of vertical static load bearing capacity test is conducted and they are complemented and verified each other. The consistent results demonstrate that the method of using the finite difference procedure in this paper to preliminarily simulate the vertical load-bearing characteristics and settlement characteristics of large-diameter and super-long steel pipe pile is feasible. The study shows that the large-diameter and super-long steel pipe pile is a typical end-bearing friction pile. The pile lateral friction resistance changes intricately with depth, which is closely related to the soil characteristics. And the transferring speed of pile axial force depends on the action of pile lateral friction resistance in the different soil. These conclusions are of significance for the reasonable large-diameter and super-long steel pipe pile foundation designed in engineering applications.%近年来,超长大直径钢管桩在工程中的应用已越来越多,但对其承载特性的研究却很少,设计中仍然参考普通桩的计算理论.本文采用三维连续介质快速拉格朗日法(FLAC3D)对实际工程中一超长大直径开口钢管桩试桩的竖向承载特性及沉降特性进行了数值模拟分析,并将模拟结果与静载荷竖向承载特性试验实测结果进行了对比,两者相互补充和相互验证,取得了比较一致的结果,表明了本文所编制的有限差分程序用以初步模拟分析超长大直径钢管桩承载特性的可行

  15. Reusable pipe flange covers

    Energy Technology Data Exchange (ETDEWEB)

    Holden, James Elliott (Simpsonville, SC); Perez, Julieta (Houston, TX)

    2001-01-01

    A molded, flexible pipe flange cover for temporarily covering a pipe flange and a pipe opening includes a substantially round center portion having a peripheral skirt portion depending from the center portion, the center portion adapted to engage a front side of the pipe flange and to seal the pipe opening. The peripheral skirt portion is formed to include a plurality of circumferentially spaced tabs, wherein free ends of the flexible tabs are formed with respective through passages adapted to receive a drawstring for pulling the tabs together on a back side of the pipe flange.

  16. Pipe drafting and design

    CERN Document Server

    Parisher, Roy A; Parisher

    2000-01-01

    Pipe designers and drafters provide thousands of piping drawings used in the layout of industrial and other facilities. The layouts must comply with safety codes, government standards, client specifications, budget, and start-up date. Pipe Drafting and Design, Second Edition provides step-by-step instructions to walk pipe designers and drafters and students in Engineering Design Graphics and Engineering Technology through the creation of piping arrangement and isometric drawings using symbols for fittings, flanges, valves, and mechanical equipment. The book is appropriate primarily for pipe

  17. Geometrical investigations of the Casimir effect: Thickness and corrugation dependencies

    Science.gov (United States)

    Parashar, Prachi

    2011-12-01

    decompose the problem into two transverse scalar modes. In Chapter 3 we collect all the solutions for the scalar Green's functions for the planar and the cylindrical geometries, which are relevant for this dissertation. In Chapter 4 we derive the interaction energy between two dielectric slabs of finite thickness. Taking the thickness of the slabs to infinity leads to the Lifshitz results for the two infinite dielectric semi-spaces, while taking the dielectric permittivity to infinity gives the well-known Casimir energy between two perfect conductors. We then present a simple model to consider the thin-plate limit (taking the thickness of the slabs to zero) based on Drude-Sommerfeld free electron gas model, which modifies the plasma frequency of the material to include the finite size dependence. We get a non-vanishing result for the Lifshitz energy in the slab thickness going to zero limit. This is remarkable progress as it allows us to understand the infinitesimal thickness limit and opens a possibility of extending this model to apply it to graphene and other two dimensional surfaces. The Casimir and Casimir-Polder results in the perfect conductor limit give us the expected results. In Chapter 5 we study the lateral Casimir torque between two concentric corrugated cylinders described by delta-potentials, which interact through a scalar field. We derive analytic expressions for the Casimir torque for the case when the corrugation amplitudes are small in comparison to the corrugation wavelengths. We derive explicit results for the Dirichlet case, and exact results for the weak coupling limit, in the leading order. The results for the corrugated cylinders approach the corresponding expressions for the case of corrugated parallel plates in the limit of large radii of the cylinders (relative to the difference in their radii) while keeping the corrugation wavelength fixed. In Chapter 6 we calculate the lateral Casimir energy between corrugated parallel dielectric slabs of

  18. Design and manufacturing of skins based on composite corrugated laminates for morphing aerodynamic surfaces

    Science.gov (United States)

    Airoldi, Alessandro; Fournier, Stephane; Borlandelli, Elena; Bettini, Paolo; Sala, Giuseppe

    2017-04-01

    The paper discusses the approaches for the design and manufacturing of morphing skins based on rectangular-shaped composite corrugated laminates and proposes a novel solution to prevent detrimental effects of corrugation on aerodynamic performances. Additionally, more complex corrugated shapes are presented and analysed. The manufacturing issues related to the production of corrugated laminates are discussed and tests are performed to compare different solutions and to assess the validity of analytical and numerical predictions. The solution presented to develop an aerodynamically efficient skin consists in the integration of an elastomeric cover in the corrugated laminate. The related manufacturing process is presented and assessed, and a fully nonlinear numerical model is developed and characterized to study the behaviour of this skin concept in different load conditions. Finally, configurations based on combinations of individual rectangular-shaped corrugated panels are considered. Their structural properties are numerically investigated by varying geometrical parameters. Performance indices are defined to compare structural stiffness contributions in non-morphing directions with the ones of conventional panels of the same weight. Numerical studies also show that the extension of the concept to complex corrugated shapes may improve both the design flexibility and some specific performances with respect to rectangular shaped corrugations. The overall results validate the design approaches and manufacturing processes to produce corrugated laminates and indicate that the solution for the integration of an elastomeric cover is a feasible and promising method to enhance the aerodynamic efficiency of corrugated skins.

  19. Fracture mechanics evaluation for at typical PWR primary coolant pipe

    Energy Technology Data Exchange (ETDEWEB)

    Tanaka, T. [Kansai Electric Power Company, Osaka (Japan); Shimizu, S.; Ogata, Y. [Mitsubishi Heavy Industries, Ltd., Kobe (Japan)

    1997-04-01

    For the primary coolant piping of PWRs in Japan, cast duplex stainless steel which is excellent in terms of strength, corrosion resistance, and weldability has conventionally been used. The cast duplex stainless steel contains the ferrite phase in the austenite matrix and thermal aging after long term service is known to change its material characteristics. It is considered appropriate to apply the methodology of elastic plastic fracture mechanics for an evaluation of the integrity of the primary coolant piping after thermal aging. Therefore we evaluated the integrity of the primary coolant piping for an initial PWR plant in Japan by means of elastic plastic fracture mechanics. The evaluation results show that the crack will not grow into an unstable fracture and the integrity of the piping will be secured, even when such through wall crack length is assumed to equal the fatigue crack growth length for a service period of up to 60 years.

  20. computing techniques for production scheduling in Corrugator manufacturing plants

    Directory of Open Access Journals (Sweden)

    Germán A. Velásquez D.

    2007-01-01

    Full Text Available The corrugator scheduling problem is a difficult problem due to a wide variety of parameters and optimisation objectives that have to be accounted for and the relationships among them. Majority of solution techniques proposed so far only deal with minimizing either, the trim waste or pattern changes, this paper proposes a multi-objective evolutionary algorithm to optimize the WPL objective (weighted planning level and the cost objectives. Computational experiments were conducted and results were compared against the current shop scheduling method used at a real-life corrugator manufacturing facility. A series of experiments were also conducted to determine the evolutionary algorithm parameters. The improvement on performance metrics encourages us to actually implement the algorithm at the factory

  1. Cryogenic piping material selection for the Component Test Facility (CTF)

    Science.gov (United States)

    St. Cyr, William W.

    1991-01-01

    The anticipated high cost of the 8500 psi cryogenic and 15,000 psi gas piping systems used in the CTF at NASA's John C. Stennis Space Center led to the consideration of high-strength materials for these piping systems. Based on years of satisfactory service using austenitic stainless steels in cryogenic applications, particularly for hydrogen service, consideration was limited to the austenitic stainless steels. Attention was focused on alternatives to the 304/304L grades of stainless steel traditionally used in these applications. This paper discusses the various considerations that resulted in the decision to continue using 304/304L for the cryogenic piping and the selection of the nitrogen-strengthened 21Cr-6Ni-9Mn alloy (UNS S21903) for the high-pressure gas systems at the CTF.

  2. Dispersion of helically corrugated waveguides: Analytical, numerical, and experimental study

    Science.gov (United States)

    Burt, G.; Samsonov, S. V.; Ronald, K.; Denisov, G. G.; Young, A. R.; Bratman, V. L.; Phelps, A. D.; Cross, A. W.; Konoplev, I. V.; He, W.; Thomson, J.; Whyte, C. G.

    2004-10-01

    Helically corrugated waveguides have recently been studied for use in various applications such as interaction regions in gyrotron traveling-wave tubes and gyrotron backward-wave oscillators and as a dispersive medium for passive microwave pulse compression. The paper presents a summary of various methods that can be used for analysis of the wave dispersion of such waveguides. The results obtained from an analytical approach, simulations with the three-dimensional numerical code MAGIC, and cold microwave measurements are analyzed and compared.

  3. Measuring autogenous strain of concrete with corrugated moulds

    DEFF Research Database (Denmark)

    Tian, Qian; Jensen, Ole Mejlhede

    2008-01-01

    A reliable technique to quantify autogenous strain is a prerequisite to numerical modeling in stress calculations for high performance concrete. The introducing of a special kind of corrugated tube mould helps to transforming volume strain measurement into liner strain measurement in horizontal...... direction for fluid concrete, which not only realizes the continuous monitoring of the autogenous shrinkage since casting, but also effectively eliminates the disturbance resulting from gravity, temperature variation and mould restraint on measuring results. Based on this measuring technique, this paper...

  4. Leagile Supply Chain Strategy of Indonesian Corrugated Box Manufacturer

    OpenAIRE

    Daryanto, Yosef

    2010-01-01

    Leagile supply chain is the combination of the lean and agile paradigms within a total supply chain strategy, for example by positioning the decoupling point to enable a levelscheduling and opening up an opportunity to drive down costs upstream while simultaneously still ensuring that there is an agile response capable of delivering to an unpredictable marketplace. The purpose of this paper is to support this hybrid leagile supplt chain understanding through case study in an Indonesian corrug...

  5. On the isothermal geometry of corrugated graphene sheets

    OpenAIRE

    Trzesowski, Andrzej

    2013-01-01

    Variational geometries describing corrugated graphene sheets are proposed. The isothermal thermomechanical properties of these sheets are described by a 2-dimensional Weyl space. The equation that couples the Weyl geometry with isothermal distributions of the temperature of graphene sheets, is formulated. This material space is observed in a 3-dimensional orthogonal configurational point space as regular surfaces which are endowed with a thermal state vector field fulfilling the isothermal th...

  6. Analytical Evaluation of Fibre-Reinforced Plastic Corrugated Sheet

    OpenAIRE

    C. K. Gautam; R. C. Pathak

    1998-01-01

    Fibre-reinforced' composites playa lead role as advanced materials in modem day structures.This paper reports fabrication and testing offibre-reinforced corrugated sheet employing 4-point bend loading. An in-depth analysis has been carried out using ANSYS, a finite element method package.The theoretical results obtained are compared with the experimental values. The values ofboth inputsshowed similar results. conforming at a particular boundary condition. However, more similarexperiments "on ...

  7. Speed of Sound in Metal Pipes: An Inexpensive Lab

    Science.gov (United States)

    Huggins, Elisha

    2008-01-01

    Our favorite demonstration for sound waves is to set up a compressional pulse on a horizontally stretched Slinky[TM]. One can easily watch the pulse move back and forth at a speed of the order of one meter per second. Watching this demonstration, it occurred to us that the same thing might happen in a steel pipe if you hit the end of the pipe with…

  8. Effect of Hot Rolling Parameters on Microstructures and Properties of 316LN Stainless Steel Pipes with Large Diameter and Thick Wall%热轧参数对大口径厚壁316LN不锈钢管组织和性能的影响研究

    Institute of Scientific and Technical Information of China (English)

    罗毅军; 陈海涛; 何昌明

    2016-01-01

    The 316LN stainless steel pipes with large diameter and thick wall were produced by Pelger pipe mill at different rolling deformation and rolling temperature.The microstructures of the hot-rolled pipes and the solution state pipes were observed by using the optical microscope.The tensile mechanical properties of the solution state pipes at room temperature were tested by using the universal testing machine.The results show that,increasing the rolling deformation can promote the nucleation process of dynamic recrystallization and refine the grains;increasing the hot rolling temperature can promote the growth process of dynamic recrystallization and coarse grains;hot rolled tube of incomplete dynamic recrystallization can produce the abnormal growth of the recrystallized grains and mixed crystal during the solution heat treatment,and mechanical properties are reduced;increasing the rolling deformation and reducing the rolling temperature can refine the grain size of the solution state pipes and improve the mechanical properties.%使用皮尔格管材轧机在不同轧制变形量和轧制温度下热轧生产了大口径厚壁316LN不锈钢管,采用光学显微镜观察了热轧态管材和固溶态管材的显微组织,采用万能试验机测定了固溶态管材的室温拉伸力学性能.结果表明:提高轧制变形量能促进热轧过程中动态再结晶的形核过程,细化动态再结晶晶粒;提高热轧温度能促进热轧过程中动态再结晶的长大过程,粗化动态再结晶晶粒;不完全动态再结晶的热轧管材在固溶热处理过程中会发生已再结晶晶粒的异常长大,产生混晶,降低力学性能;提高轧制变形量和降低轧制温度可以细化固溶态管材的晶粒尺寸,提高力学性能.

  9. BEAM PIPE IS INSTALLED

    CERN Multimedia

    The installation of the central section of the beam pipe into the heart of the  CMS was completed by 23 April. All the beam pipe elements have been successfully vacuum-tested and the bakeout started.  

  10. Non-contact gears: II. Casimir torque between concentric corrugated cylinders for the scalar case

    CERN Document Server

    Cavero-Pelaez, Ines; Parashar, Prachi; Shajesh, K V

    2008-01-01

    The Casimir interaction between two concentric corrugated cylinders provides the mechanism for non-contact gears. To this end, we calculate the Casimir torque between two such cylinders, described by $\\delta$-potentials, which interact through a scalar field. We derive analytic expressions for the Casimir torque for the case when the corrugation amplitudes are small in comparison to the corrugation wavelengths. We derive explicit results for the Dirichlet case, and exact results for the weak coupling limit, in the leading order. The results for the corrugated cylinders approach the corresponding expressions for the case of corrugated parallel plates in the limit of large radii of cylinders (relative to the difference in their radii) while keeping the corrugation wavelength fixed.

  11. Analysis of wheel motion on corrugated rail; Corrugation ga hasseishita rail wo sokosuru sharin no undo kaiseki

    Energy Technology Data Exchange (ETDEWEB)

    Horie, A. [Tokyo Gas Co. Ltd., Tokyo (Japan); Ikuta, S.; Suda, Y. [The University of Tokyo, Tokyo (Japan). Institute of Industrial Science] Terumichi, Y. [Sophia University, Tokyo (Japan). Faculty of Science and Technology; Ono, S. [The University of Tokyo, Tokyo (Japan)

    1998-09-01

    An analysis is conducted into the compound vibration of a wheel/rail system which is a two-axle truck travelling on rails with corrugation type wear generated thereon. Each wheel is analyzed using an analysis model in which the travelling mass, contact spring (concentrated mass system of one degree of freedom), and rails provide a system of distributed constants. Calculation is then made about the variation in the contact force that occurs between the wheels and rails when the truck travels at a prescribed speed in a sector with corrugation (assumed to be sinusoidal) generated on the rails therein. It is then found that there is interaction between the front wheels and rear wheels, that the lateral vibration generated by the excitation of rails due to the traveling of the front wheels is transmitted through the rails to reach the rear wheels for their excitation for an increase in the variation in the contact force between the rear wheels and rails and that, vice versa, the travel of the rear wheels increases the variation in the contact force between the front wheels and rails. It is also found, concerning both front wheels and rear wheels, that there are periodic fluctuations, dependent on the wheelbase, in the amplitude of the contact force variation at the steady state and that the period, as compared with the wavelength of corrugation, is shorter in the front wheels and longer in the rear wheels. 4 refs., 5 figs.

  12. Small, Untethered, Mobile Robots for Inspecting Gas Pipes

    Science.gov (United States)

    Wilcox, Brian

    2003-01-01

    Small, untethered mobile robots denoted gas-pipe explorers (GPEXs) have been proposed for inspecting the interiors of pipes used in the local distribution natural gas. The United States has network of gas-distribution pipes with a total length of approximately 109 m. These pipes are often made of iron and steel and some are more than 100 years old. As this network ages, there is a need to locate weaknesses that necessitate repair and/or preventive maintenance. The most common weaknesses are leaks and reductions in thickness, which are caused mostly by chemical reactions between the iron in the pipes and various substances in soil and groundwater. At present, mobile robots called pigs are used to inspect and clean the interiors of gas-transmission pipelines. Some carry magnetic-flux-leakage (MFL) sensors for measuring average wall thicknesses, some capture images, and some measure sizes and physical conditions. The operating ranges of pigs are limited to fairly straight sections of wide transmission- type (as distinguished from distribution- type) pipes: pigs are too large to negotiate such obstacles as bends with radii comparable to or smaller than pipe diameters, intrusions of other pipes at branch connections, and reductions in diameter at valves and meters. The GPEXs would be smaller and would be able to negotiate sharp bends and other obstacles that typically occur in gas-distribution pipes.

  13. Quasi-phase-matched high harmonic generation in corrugated micrometer-scale waveguides

    CERN Document Server

    Husakou, Anton

    2016-01-01

    The high harmonic generation in periodically corrugated submicrometer waveguides is studied numerically. Plasmonic field enhancement in the vicinity of the corrugations allows to use low pump intensities. Simultaneously, periodic placement of the corrugations leads to quasi-phase-matching and corresponding increase of the high harmonic efficiency. The optimization of waveguide geometry is performed, and the resulting spectra are analyzed by the means of (1+1)D numerical model.

  14. Geometrical parameters influence on behavior of the sandwich plates with corrugated core

    Directory of Open Access Journals (Sweden)

    Djoković Jelena M.

    2016-01-01

    Full Text Available The influence of geometric parameters on behavior and stiffness of sandwich plates with corrugated core is considered in this paper. The following parameters were analyzed: ratio of core sheet and facing sheet thickness and the ratio of the core’s pitch to the core’s depth, as well as the corrugation angle. It is shown that changes of these parameters can contribute to increase or decrease of the corrugated sandwich plate stiffness.

  15. An overview of environmental degradation of materials in nuclear power plant piping systems

    Energy Technology Data Exchange (ETDEWEB)

    Shack, W.J.

    1987-08-01

    Piping in light water reactor (LWR) power systems is affected by several types of environmental degradation: intergranular stress corrosion cracking (IGSCC) of austenitic stainless steel piping in boiling water reactors (BWRs) has required research, inspection, and mitigation programs that will ultimately cost several billion dollars; erosion-corrosion of carbon steel piping has been observed frequently in the secondary systems of both BWRs and pressurized water reactors (PWRs); the effect of the BWR environment can greatly diminish the design margin inherent in the ASME Section III fatigue design curves for carbon steel piping; and cast stainless steels are subject to embrittlement after extended thermal aging at reactor operating temperatures. These problems are being addressed by wide-ranging research programs in this country and abroad. The purpose of this review is to highlight some of the accomplishments of these programs and to note some of the remaining unanswered questions.

  16. 75 FR 49891 - Drill Pipe from the People's Republic of China: Notice of Preliminary Affirmative Determination...

    Science.gov (United States)

    2010-08-16

    ... Circumstances Determination: Carbon and Certain Alloy Steel Wire Rod From Germany, 67 FR 55808, 55809 (August 30... drill pipe to the United States during the POI subsequently claimed that their shipments do not, in fact...

  17. Fatigue life prediction of casing welded pipes by using the extended finite element method

    National Research Council Canada - National Science Library

    Ljubica Lazi; Aleksandar Raji; Aleksandar Grbovi; Aleksandar Sedmak; e Sarko

    2016-01-01

      The extended finite element (XFEM) method has been used to simulate fatigue crack growth in casing pipe, made of API J55 steel by high-frequency welding, in order estimate its structural integrity and life...

  18. Application of Corrugated Lamella in Settler of Waterworks%波纹型斜板在水厂沉淀池改造中的应用

    Institute of Scientific and Technical Information of China (English)

    李钟珮

    2009-01-01

    在水厂沉淀池前部沿池宽方向增设侧向流不锈钢波纹斜板组,可在占地受限的情况下,有效改善现有水厂絮凝沉淀池的沉淀条件,达到进一步提高水质的目的.%A side-flow stainless steel corrugated lamella unit was additionally installed foreside a-long the width direction of settler in waterworks. In the case of limited land, it can improve the settling condition of flocculation settler, achieving the goal of further improving water quality.

  19. Intrinsic and extrinsic corrugation of monolayer graphene deposited on SiO2

    OpenAIRE

    Geringer, V.; Liebmann, M.; Echtermeyer, T.; Runte, S.; Schmidt, M.; Rückamp, R.; Lemme, M.; Morgenstern, M.

    2008-01-01

    Using scanning tunneling microscopy (STM) in ultra high vacuum and atomic force microscopy, we investigate the corrugation of graphene flakes deposited by exfoliation on a Si/SiO2 (300 nm) surface. While the corrugation on SiO2 is long-range with a correlation length of about 25 nm, some of the graphene monolayers exhibit an additional corrugation with a preferential wave length of about 15 nm. A detailed analysis shows that the long range corrugation of the substrate is also visible on graph...

  20. 管线钢大电流双面高速埋弧焊接用焊丝研制%Development of Wire for Large Current Double Side Submerged Arc Welding of Pipe Steel

    Institute of Scientific and Technical Information of China (English)

    彭云; 陈武柱; 许祖泽

    2001-01-01

    介绍了石油、天然气输送管线用埋弧焊丝的特征及高韧性焊丝成分设计原则。分别采用92kg高频感应炉实验室冶炼,500kg中频感应炉半工业性冶炼和300t顶吹氧气转炉工业化大生产冶炼,进行焊丝研制。对所研制的焊丝配合烧结焊剂SJ101,进行了无坡口双面埋弧焊试验,测试了焊缝成分、冲击韧度、金相组织、硬度和接头抗拉强度。用扫描电镜分析了冲击断口形貌及夹杂物组成,透射电镜分析了焊缝金属的微观结构,俄歇试验分析了B、Ti、N在焊缝中的分布。结果表明,B在原奥氏体晶界偏聚,可抑制先共析铁素体在晶界析出,弥散分布的细小夹杂物有助于针状铁素体的生成,配合降低S、P、气体元素和杂质含量,可使焊缝金属具有高的韧性。焊缝硬度在HV185~HV214之间,与母材平均硬度HV190为同一水平。焊缝金属横向抗拉强度高于母材。%In this paper,the characteristics of wire for submerged arc welding of oil and gas pipe line and the principles for the design of chemical compositions of high toughness welding wire are discussed.Steels of wire are smelted in high frequency induction furnace,medium frequency induction furnace,and top oxygen blown converter respectively.Matching the agglomerated flux SJ101,these wires are used for double side submerged arc welding.The chemical compositions,impact toughness,microstructure of weld metal and hardness and tensile strength of welded joint are investigated.The fractured surfaces of impact specimens are analyzed by scanning electron microscope,the microstructures of weld metal are analyzed by transmission electron microscope,and the distributions of B,Ti,N are examined by Auger spectrum analysis.It is indicated that B segregates in the boundary of original austenite grains,that is beneficial for the restriction proeutectoid ferrite.Uniformly distributed particles are helpful for the

  1. Impedance modelling of pipes

    Science.gov (United States)

    Creasy, M. Austin

    2016-03-01

    Impedance models of pipes can be used to estimate resonant frequencies of standing waves and model acoustic pressure of closed and open ended pipes. Modelling a pipe with impedance methods allows additional variations to the pipe to be included in the overall model as a system. Therefore an actuator can be attached and used to drive the system and the impedance model is able to include the dynamics of the actuator. Exciting the pipe system with a chirp signal allows resonant frequencies to be measured in both the time and frequency domain. The measurements in the time domain are beneficial for introducing undergraduates to resonances without needing an understanding of fast Fourier transforms. This paper also discusses resonant frequencies in open ended pipes and how numerous texts incorrectly approximate the resonant frequencies for this specific pipe system.

  2. Corrosion resistance of 15Mo3 in steam boiler pipe surfaced with Inconel 625 alloy

    Energy Technology Data Exchange (ETDEWEB)

    Aracic, S.; Samardzic, I.; Krumes, D. [Mechanical Engineering Faculty, Trg Ivane Brlic Mazuranic 18, HR-35000 Slavonski Brod (Croatia)

    2004-07-01

    This paper presents accelerated laboratory corrosion resistant investigation results made on steam boiler 15Mo3 steel pipes surfaced with alloy Inconel 625. Surfacing of 15Mo3 pipes was made due to pipes corrosion resistance increase in exploitation conditions which are present in fire box of trash burning plant. Corrosion resistance investigations were made in fire box simulated atmosphere and in salt spray chamber. (authors)

  3. Phased array ultrasonic technology contribution to engineering critical assessment (ECA) of economizer piping welds

    Energy Technology Data Exchange (ETDEWEB)

    Ciorau, P.; Gray, D.; Daks, W. [Ontario Power Generation, Pickering, Ontario (Canada)]. E-mail: peter.ciorau@opg.com

    2006-09-15

    This paper describes the application of phased array ultrasonic technology for engineering critical assessment of economizer piping welds. The objective is to detect and size fatigue cracks in the counter bore area of carbon steel boiler feedwater piping welds of a thermal station. A size accuracy of {+-} 1 mm for the outer ligament was required.

  4. Continuous Surveillance Technique for Flow Accelerated Corrosion of Pipe Wall Using Electromagnetic Acoustic Transducer

    Science.gov (United States)

    Kojima, F.; Kosaka, D.; Umetani, K.

    2011-06-01

    In this paper, we propose a on-line monitoring technique using electromagnetic acoustic transducer (EMAT). In the series of laboratory experiments, carbon steel pipes were used and each sample was fabricated to simulate FAC. Electromagnetic acoustic resonance method (EMAR) is successfully tested for pipe wall thickness measurements. The validity and the feasibility of our method are also demonstrated through the laboratory experiments.

  5. Overall Thermal Performance of Flexible Piping Under Simulated Bending Conditions

    Science.gov (United States)

    Fesmire, James E.; Augustynowicz, S. D.; Demko, J. A.; Thompson, Karen (Technical Monitor)

    2001-01-01

    Flexible, vacuum-insulated transfer lines for low-temperature applications have higher thermal losses than comparable rigid lines. Typical flexible piping construction uses corrugated tubes, inner and outer, with a multilayer insulation (MLI) system in the annular space. Experiments on vacuum insulation systems in a flexible geometry were conducted at the Cryogenics Test Laboratory of NASA Kennedy Space Center. The effects of bending were simulated by causing the inner tube to be eccentric with the outer tube. The effects of spacers were simulated in a controlled way by inserting spacer tubes for the length of the cylindrical test articles. Two material systems, standard MLI and a layered composite insulation (LCI), were tested under the full range of vacuum levels using a liquid nitrogen boiloff calorimeter to determine the apparent thermal conductivity (k-value). The results indicate that the flexible piping under simulated bending conditions significantly degrades the thermal performance of the insulation system. These data are compared to standard MLI for both straight and flexible piping configurations. The definition of an overall k-value for actual field installations (k(sub oafi)) is described for use in design and analysis of cryogenic piping systems.

  6. High light transmission through thin absorptive corrugated films.

    Science.gov (United States)

    Dmitruk, Nicolas L; Korovin, Alexander V

    2008-05-01

    The enhancement of light transmittance through periodically relief thin absorptive film at surface plasmon polariton excitation conditions, as a function of relief interrelation, was considered theoretically. Our calculation of transmittance-reflectance through periodically relief thin absorptive film was performed in the framework of differential formalism. There are two basic relief interrelation forms, namely, correlated and anticorrelated ones. The obtained spectral and angular dependencies demonstrate an essential increase of surface plasmon polariton peaks in the case of anticorrelated corrugation of film in comparison with the correlated ones.

  7. Non destructive testing for seamless pipes steel inspection of Vallourec and Mannesmann of Brazil: innovation, quality and satisfaction of their clients; Ensaios nao destrutivos para inspecao de tubos de aco sem costura da Vallourec e Mannesmann do Brasil: inovacao, qualidade e satisfacao de seus clientes

    Energy Technology Data Exchange (ETDEWEB)

    Eufrasio, Edson; Pawellwtz, Reinhard [V e M do Brasil S.A., Belo Horizonte, MG (Brazil)

    2004-07-01

    Seamless steel pipes presents wide application in many areas, which require high levels of quality , requirements and security of the product are guaranteed. In face to these requirements, V and M do Brazil is always in the vanguard of the technological innovation, in order to offer products with high level of quality and uniformity to the customers requirements. To guarantee the quality of its products, V and M do Brazil uses an ample variety of destructive and nondestructive testings, systems of measurement and inspection, which are distributed throughout all the productive process, in different production lines. Pioneering in the development of new techniques of inspection, mainly with relation to the non destructive testings, has been a constant mark of V and M do Brazil; assuring of this form, the improvement and expansion of the non destructive testings in the inspection of its products from the use of new techniques, as well as the improvement of the quality. (author)

  8. 日光温室钢管屋架管网水循环集放热系统的性能分析与试验%Analysis and experiment of performance on water circulation system of steel pipe network formed by roof truss for heat collection and release in Chinese solar greenhouse

    Institute of Scientific and Technical Information of China (English)

    马承伟; 姜宜琛; 程杰宇; 赵淑梅; 夏楠; 王平智; 阳萍

    2016-01-01

    with the floor area of 620 m2 in Beijing. The pipe network consisted of 68 roof trusses with the spacing of 1 m, and both top and bottom booms were made of steel pipes with the inner diameter of 25.7 mm and the outer diameter of 33.5 mm. The effective cubage of the tank was 8.6 m3. When the system of pipe network was operating, the water in the tank would be pumped into the top booms and then flowed into the bottom booms, and finally it returned to the tank. The system would be operated for heat storage when the indoor temperature of greenhouse became over 20℃ in the daytime, and for heat release when the indoor temperature of greenhouse became below 10℃ in the evening. The results showed that the average rise in the temperature of the water in the tank was 4.7℃, the average thermal storage capacity was 149 MJ, and the average thermal storage flux was 8 721 W in the daytime, and that the average drop in the temperature of the water in the tank was 2.5℃, the average heat release capacity was 78.9 MJ, and the average heat release flux was 5 974 W in the evening. Compared with a control solar greenhouse, the minimum daily average indoor temperature in the test greenhouse was improved by 2.4℃ at night. The water circulation system of pipe network is formed by the greenhouse’s own roof truss, and therefore it consumes less extra materials, its manufacturing cost is lower, and it has not any impact on the greenhouse production space. Moreover, it has the advantages of simpler operation, lower operating cost, easier maintenance, and so on.

  9. Manufacturing Technology Research and Appraisal of Large-Diameter SSAW Pipe Applied to the West-East Pipeline Project

    Institute of Scientific and Technical Information of China (English)

    DingXiaojun; YangZhongwen; XiaXianhua; LiXiaobo

    2005-01-01

    This paper introduced the research and development of large-diameter SSAW pipes applied to West-East Pipeline project as well as domestic acicular ferrite pipeline steel of X70 grade. Its microstructure analysis was performed in comparison with the pipeline steel of a foreign steel plant (SPC). This paper introduced the research of welding procedures prior to SSAW pipe making and some new procedures and technologies used for West-East Pipeline Project, and appraised the practical level of Large-diameter SSAW pipe applied to the West-East Pipeline Project.

  10. Effect of long-range structural corrugations on magnetotransport properties of phosphorene in tilted magnetic field

    Science.gov (United States)

    Mogulkoc, A.; Modarresi, M.; Rudenko, A. N.

    2017-08-01

    Rippling is an inherent quality of two-dimensional materials playing an important role in determining their properties. Here, we study the effect of structural corrugations on the electronic and transport properties of monolayer black phosphorus (phosphorene) in the presence of tilted magnetic field. We follow a perturbative approach to obtain analytical corrections to the spectrum of Landau levels induced by a long-wavelength corrugation potential. We show that surface corrugations have a non-negligible effect on the electronic spectrum of phosphorene in tilted magnetic field. Particularly, the Landau levels are shown to exhibit deviations from the linear field dependence. The observed effect become especially pronounced at large tilt angles and corrugation amplitudes. Magnetotransport properties are further examined in the low temperature regime taking into account impurity scattering. We calculate magnetic field dependence of the longitudinal and Hall resistivities and find that the nonlinear effects reflecting the corrugation might be observed even in moderate fields (B <10 T).

  11. Corrugated Textile based Triboelectric Generator for Wearable Energy Harvesting

    Science.gov (United States)

    Choi, A Young; Lee, Chang Jun; Park, Jiwon; Kim, Dogyun; Kim, Youn Tae

    2017-01-01

    Triboelectric energy harvesting has been applied to various fields, from large-scale power generation to small electronics. Triboelectric energy is generated when certain materials come into frictional contact, e.g., static electricity from rubbing a shoe on a carpet. In particular, textile-based triboelectric energy-harvesting technologies are one of the most promising approaches because they are not only flexible, light, and comfortable but also wearable. Most previous textile-based triboelectric generators (TEGs) generate energy by vertically pressing and rubbing something. However, we propose a corrugated textile-based triboelectric generator (CT-TEG) that can generate energy by stretching. Moreover, the CT-TEG is sewn into a corrugated structure that contains an effective air gap without additional spacers. The resulting CT-TEG can generate considerable energy from various deformations, not only by pressing and rubbing but also by stretching. The maximum output performances of the CT-TEG can reach up to 28.13 V and 2.71 μA with stretching and releasing motions. Additionally, we demonstrate the generation of sufficient energy from various activities of a human body to power about 54 LEDs. These results demonstrate the potential application of CT-TEGs for self-powered systems.

  12. A comprehensive track model for the improvement of corrugation models

    Science.gov (United States)

    Gómez, J.; Vadillo, E. G.; Santamaría, J.

    2006-06-01

    This paper presents a detailed model of the railway track based on wave propagation, suitable for corrugation studies. The model analyses both the vertical and the transverse dynamics of the track. Using the finite strip method (FSM), only the cross-section of the rail must be meshed, and thus it is not necessary to discretise a whole span in 3D. This model takes into account the discrete nature of the support, introducing concepts pertaining to the theory of periodic structures in the formulation. Wave superposition is enriched taking into account the contribution of residual vectors. In this way, the model obtains accurate results when a finite section of railway track is considered. Results for the infinite track have been compared against those presented by Gry and Müller. Aside from the improvements provided by the model presented in this paper, which Gry's and Müller's models do not contemplate, the results arising from the comparison prove satisfactory. Finally, the calculated receptances are compared against the experimental values obtained by the authors, demonstrating a fair degree of adequacy. Finally, these receptances are used within a linear model of corrugation developed by the authors.

  13. 75 FR 54912 - Drill Pipe and Drill Collars From China

    Science.gov (United States)

    2010-09-09

    ... green tubes suitable for drill pipe), without regard to the specific chemistry of the steel (i.e... general application, consult the Commission's Rules of Practice and Procedure, part 201, subparts A... hearing and make oral presentations should attend a prehearing conference to be held at 9:30 a.m....

  14. Test of Seal System for Flexible Pipe End Fitting

    DEFF Research Database (Denmark)

    Banke, Lars; Jensen, Thomas Gregers

    1999-01-01

    by compression of the gaskets, thus using the geometry to establish a seal towards the inner liner of the pipe and the steel sleeve of the end fitting. This paper describes how the seal system of an end fitting can be tested using an autoclave. By regulating temperature and pressure, the seal system can...

  15. Introduction to Heat Pipes

    Science.gov (United States)

    Ku, Jentung

    2015-01-01

    This is the presentation file for the short course Introduction to Heat Pipes, to be conducted at the 2015 Thermal Fluids and Analysis Workshop, August 3-7, 2015, Silver Spring, Maryland. NCTS 21070-15. Course Description: This course will present operating principles of the heat pipe with emphases on the underlying physical processes and requirements of pressure and energy balance. Performance characterizations and design considerations of the heat pipe will be highlighted. Guidelines for thermal engineers in the selection of heat pipes as part of the spacecraft thermal control system, testing methodology, and analytical modeling will also be discussed.

  16. Heat Pipe Planets

    Science.gov (United States)

    Moore, William B.; Simon, Justin I.; Webb, A. Alexander G.

    2014-01-01

    When volcanism dominates heat transport, a terrestrial body enters a heat-pipe mode, in which hot magma moves through the lithosphere in narrow channels. Even at high heat flow, a heat-pipe planet develops a thick, cold, downwards-advecting lithosphere dominated by (ultra-)mafic flows and contractional deformation at the surface. Heat-pipes are an important feature of terrestrial planets at high heat flow, as illustrated by Io. Evidence for their operation early in Earth's history suggests that all terrestrial bodies should experience an episode of heat-pipe cooling early in their histories.

  17. Investigation into the vibration of metro bogies induced by rail corrugation

    Science.gov (United States)

    Ling, Liang; Li, Wei; Foo, Elbert; Wu, Lei; Wen, Zefeng; Jin, Xuesong

    2017-01-01

    The current research of rail corrugation mainly focuses on the mechanisms of its formation and development. Compared with the root causes and development mechanisms, the wheel-rail impacts, the fatigue failure of vehicle-track parts, and the loss of ride comfort due to rail corrugation should also be taken into account. However, the influences of rail corrugation on vehicle and track vibration, and failure of vehicle and track structural parts are barely discussed in the literature. This paper presents an experimental and numerical investigation of the structural vibration of metro bogies caused by rail corrugation. Extensive experiments are conducted to investigate the effects of short-pitch rail corrugation on the vibration accelerations of metro bogies. A dynamic model of a metro vehicle coupled with a concrete track is established to study the influence of rail corrugation on the structural vibration of metro bogies. The field test results indicate that the short-pitch rail corrugation generates strong vibrations on the axle-boxes and the bogie frames, therefore, accelerates the fatigue failure of the bogie components. The numerical results show that short-pitch rail corrugation may largely reduce the fatigue life of the coil spring, and improving the damping value of the primary vertical dampers is likely to reduce the strong vibration induced by short-pitch rail corrugation. This research systematically studies the effect of rail corrugation on the vibration of metro bogies and proposes some remedies for mitigating strong vibrations of metro bogies and reducing the incidence of failure in primary coil springs, which would be helpful in developing new metro bogies and track maintenance procedures.

  18. EFFECTIVE STIFFNESS METHOD FOR CALCULATING DEFLECTION OF CORRUGATED WEB GIRDER%波形钢腹板梁变形计算的有效刚度法

    Institute of Scientific and Technical Information of China (English)

    聂建国; 李法雄; 樊健生

    2012-01-01

    By introducing a shear rotation function accounting for the shear deformation in the webs, the paper presents a beam theory model of corrugated web girder, where the flexural behavior of corrugated web girder is modeled as the combination of truss action and bending action between upper flange and lower flange. Then analytical solutions for simply supported corrugated steel web girders and cantilever corrugated steel web girders are derived under uniformly distributed load and concentrated load, and the analytical solutions are well verified through a comparison with FEM results. In order to determine the deformation of corrugated web girders for the purpose of practical design, a simplified design method to calculate the deflection of corrugated web girders considering web shear deformation is presented by introducing an importance parameter. The deflections calculated by this method agree well with those obtained from experiments. According to the comparison of calculated deflections among different design methods for corrugated web girders, the simplified method presented in this study has good accuracy and is convenient to use.%为研究波形钢腹板剪切变形对波形钢腹板梁受力行为的影响,引入腹板剪切变形转角函数,将波形钢腹板梁的弯曲行为分解为桁架作用和弯曲作用,建立一个能够考虑波形钢腹板剪切变形的波形钢腹板梁理论模型,推导了简支和悬臂波形钢腹板梁在不同类型荷载作用下的变形解析解,采用有限元方法验证了理论模型和解析解的正确性和适用性。根据变形等效原理,引入重要影响参数对波形钢腹板梁的变形解析解进行简化,提出了考虑腹板剪切行为的波形钢腹板梁变形简化计算方法——有效刚度法。用该文提出的有效刚度法计算波形钢腹板梁在正常使用极限状态下的变形值和试验结果吻合良好,为波形钢腹板梁在正常使用极限状态下的

  19. Pigging ends freezeups in caustic piping system

    Energy Technology Data Exchange (ETDEWEB)

    Gros, R.; Gaines, A.

    1985-03-01

    Convent Chemical Corporation in Convent, LA produces and ships bulk quantities of chlorine and caustic soda (NaOH). The caustic soda is available in various grades, including a 50% aqueous solution that freezes at 56/sup 0/F. An extensive network of chemical-resistant polypropylene-lined steel pipe (without heat tracing) is used to transfer the caustic soda from the production area to storage tanks and to the loading facilities for tank trucks, rail tank cars and barges. A sudden drop in ambient temperature can cause freezeup of the caustic transfer pipes which may result in downtime of as much as a week. Convent plant engineers designed a pigging system for the outdoor caustic transfer lines in the tank farm and to the loading stations. The patented design pig, (internal pipeline cleaner) consists of a flexible, bullet-shaped cylinder of chemical-resistant polyurethane foam with strips of urethane rubber on the surface, or with a solid coating of the tough material. Fluid or gas pressure on the sealed concave base propels the flexible pig through the pipe, valves, elbows, and other fittings, and material ahead of the pig is discharged into an appropriate receiver. The pigging system has eliminated the caustic freezing and plugging problems since it was installed in the summer of 1981. The flexible pig, propelled by 80 psi air, is used to clear the pipelines whenever caustic is transferred during the winter months. The air-propelled pig is designed and sized to easily pass through restrictions in the piping system, such as reduced port plug valves, but was once stuck when it reached a section of pipe that had collapsed. A pig containing the Cobalt 60 nuclear element was inserted into the line to quickly locate the stuck pig with the Geiger counter. The faulty section of pipe was replaced with a new polypropylene lined spool piece.

  20. A study on the impediment of thickness diminution of carbon steel tube using applied magnetic field

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Jong Oh; Hong, Seong Min [Chungnam National Univ., Taejon (Korea, Republic of); Park, Yun Won [Korea Institute of Nuclear Safety, Taejon (Korea, Republic of)

    2002-03-15

    Carbon steel pipe is used as a pipe laying for the cooling water of nuclear reactor. In order to examine the diminution of steel thickness, the magnetic field permeability of applicable permanent magnets was simulated by computer. The susceptibility of the permanent magnets according to the temperature was measured to investigate the applicability of permanent magnets at the cooling water temperature of nuclear power plant. The structure and magnetic properties of carbon steel tube were observed regarding to the existence of oxidized layer.

  1. Light Gauge Stainless Steel Pipes Rolling Thread Connecting Construction Technology%薄壁不锈钢给水管滚压螺纹连接施工技术

    Institute of Scientific and Technical Information of China (English)

    齐铭安; 齐俊彬

    2012-01-01

    In recent years, with the growing popularity of domestic developed light gauge stainless pipes applied in the high-quality drinking water system and hot water system piping installation, the higher requirements of attach- ment procedure have been put forward for light gauge stainless water supply pipeline installation. According to the analysis of the rolling thread connecting construction technology, a set of technology has been determined which includes the pipe necking, the thread rolling, the installation and connection, and hydrostatic test. This research mentions that the solutions to achieve the harmony and unity of function and perception of the quality, in order to improve the quality of light gauge stainless pipe connection.%随着近几年国内发展起来的薄壁不锈钢管在优质饮用水系统、热水系统管道安装工程中的应用越来越普及,对薄壁不锈钢给水管道安装工程的连接工艺提出了更高的要求。本文通过对薄壁不锈钢给水管滚压螺纹连接施工技术的研究和分析,确定了管道的缩口、螺纹滚压、安装连接及水压试验的一套施工技术.从而达到使用功能、观感质量的和谐统一,以提高薄壁不锈钢给水管的连接质量。

  2. Application of LBB to high energy piping systems in operating PWR

    Energy Technology Data Exchange (ETDEWEB)

    Swamy, S.A.; Bhowmick, D.C. [Westinghouse Nuclear Technology Division, Pittsburgh, PA (United States)

    1997-04-01

    The amendment to General Design Criterion 4 allows exclusion, from the design basis, of dynamic effects associated with high energy pipe rupture by application of leak-before-break (LBB) technology. This new approach has resulted in substantial financial savings to utilities when applied to the Pressurized Water Reactor (PWR) primary loop piping and auxiliary piping systems made of stainless steel material. To date majority of applications pertain to piping systems in operating plants. Various steps of evaluation associated with the LBB application to an operating plant are described in this paper.

  3. ESTIMATION OF RESIDUAL CONTACT PRESSURE IN HYDRAULICALLY EXPANDED CRA-LINED PIPE

    Institute of Scientific and Technical Information of China (English)

    Wang Xuesheng; Li Peining; Wang Ruzhu

    2004-01-01

    The mechanically bonded CRA-lined pipe is developed to meet the need for corrosion-resistant alloy steel pipe. Residual contact pressure at the interface of lined pipe is important factor that governs the quality of lined pipe. A simplified theoretical method is presented to predict the residual contact pressure created by hydraulic pressure. The calculating equation related hydro-forming pressure to the residual contact pressure between two metal faces is derived. And the validation of the proposed equation is accomplished by comparing its result to those obtained by experimental investigation.

  4. Imperfection analysis of flexible pipe armor wires in compression and bending

    DEFF Research Database (Denmark)

    Østergaard, Niels Højen; Lyckegaard, Anders; Andreasen, Jens H.

    2012-01-01

    The work presented in this paper is motivated by a specific failure mode known as lateral wire buckling occurring in the tensile armor layers of flexible pipes. The tensile armor is usually constituted by two layers of initially helically wound steel wires with opposite lay directions. During pipe...... laying in ultra deep waters, a flexible pipe experiences repeated bending cycles and longitudinal compression. These loading conditions are known to impose a danger to the structural integrity of the armoring layers, if the compressive load on the pipe exceeds the total maximum compressive load carrying...

  5. Optimization of Pipe Networks

    DEFF Research Database (Denmark)

    Hansen, C. T.; Madsen, Kaj; Nielsen, Hans Bruun

    1991-01-01

    The paper treats a piping system, where the layout of the network is given but the diameters of the pipes should be chosen among a small number of different values. The cost of realizing the system should be minimized while keeping the energy heads at the nodes above some lower limits. A new...

  6. A heat pipe

    Energy Technology Data Exchange (ETDEWEB)

    Rachev, L.A.; Kravtsov, A.A.

    1979-02-08

    A thermal pipe is described which contains a hermetically sealed body with a reticular filler. In order to increase the transmitted thermal power, the pipe is equipped with a high voltage source and with insulators, located between the wall of the body and the filler, where the latter is switched in to the high voltage source, preferably an adjustable one.

  7. Transient Behaviour of a Heat Pipe with Extracapillary Circulation

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    Heat pipe devices, for their typical working mode, are particularly suitable for zero gravity applications, and have also been considered for applications in space satellites with nuclear generators because of the absence of active systems for the coolant circulation. The present work reports the results of experimental tests carried out on a heat pipe facility designed to investigate the thermal-hydraulic performance of a water heat pipe. The device layout, configuration and geometry, simulate a heat pipe working mode utilizable in space applications under zero gravity conditions. The evaporating section, completely lined (covered) with wicks (sintered stainless steel), and nearly plane shaped, is housed in a cylindrical container. The obtained results show that the system can approach steady-state conditions, at a pressure of 4 bar and with a heat flux transferred of about 150 W/cm2, supporting an electric power step of about 1.8 Kw.

  8. Experimental investigation of transitional flow in a toroidal pipe

    CERN Document Server

    Kühnen, J; Hof, B; Kuhlmann, H

    2015-01-01

    The flow instability and further transition to turbulence in a toroidal pipe (torus) with curvature (tube-to-coiling diameter) 0.049 is investigated experimentally. The flow inside the toroidal pipe is driven by a steel sphere fitted to the inner pipe diameter. The sphere is moved with constant azimuthal velocity from outside the torus by a moving magnet. The experiment is designed to investigate curved pipe flow by optical measurement techniques. Using stereoscopic particle image velocimetry, laser Doppler velocimetry and pressure drop measurements, the flow is measured for Reynolds numbers ranging from 1000 to 15000. Time- and space-resolved velocity fields are obtained and analysed. The steady axisymmetric basic flow is strongly influenced by centrifugal effects. On an increase of the Reynolds number we find a sequence of bifurcations. For Re=4075 a supercritical bifurcation to an oscillatory flow is found in which waves travel in the streamwise direction with a phase velocity slightly faster than the mean...

  9. LHCb celebrates completion of its beam pipe

    CERN Multimedia

    2007-01-01

    Members of the LHCb collaboration and of the AT and TS Departments are ready to pop open the champagne bottles and celebrate the complete installation and commissioning of the LHCb experiment’s beam pipe. Members of the LHCb collaboration and of the AT and TS Departments gather near the newly completed beam pipe in the foreground. All four sections of LHCb’s beam pipe have been installed, interconnected, pumped down and baked out.. Three of the conical tubes are made of beryllium in order to minimize the level of background in the experiment, while the fourth and largest section is composed of stainless steel. The first of the beryllium sections, an important connection to the Vertex Locator vacuum vessel (VELO) was installed in August 2006 (see Bulletin No. 37/2006). One of the more challenging tasks was the installation of the longest (6 m) piece of beryllium beam pipe through the 2.4 m long RICH2 detector in January 2006. Deli...

  10. Oscillating heat pipes

    CERN Document Server

    Ma, Hongbin

    2015-01-01

    This book presents the fundamental fluid flow and heat transfer principles occurring in oscillating heat pipes and also provides updated developments and recent innovations in research and applications of heat pipes. Starting with fundamental presentation of heat pipes, the focus is on oscillating motions and its heat transfer enhancement in a two-phase heat transfer system. The book covers thermodynamic analysis, interfacial phenomenon, thin film evaporation,  theoretical models of oscillating motion and heat transfer of single phase and two-phase flows, primary  factors affecting oscillating motions and heat transfer,  neutron imaging study of oscillating motions in an oscillating heat pipes, and nanofluid’s effect on the heat transfer performance in oscillating heat pipes.  The importance of thermally-excited oscillating motion combined with phase change heat transfer to a wide variety of applications is emphasized. This book is an essential resource and learning tool for senior undergraduate, gradua...

  11. Comparison of manufacturing of lightweight corrugated sheet sandwiches by hydroforming and incremental sheet forming

    Science.gov (United States)

    Maqbool, Fawad; Elze, Lars; Seidlitz, Holger; Bambach, Markus

    2016-10-01

    Sandwich materials made from corrugated sheet metal provide excellent mechanical properties for lightweight design without using filler material. The increased mechanical properties of these sandwich materials are achieved by the 3-D geometry of the corrugated sheet and the hardening due to pre-forming. In the present study, manufacturing of corrugated sheet metal consisting of hexagonal bulge patterns through hydroforming and incremental forming is analyzed. Double layered corrugated sheet metal sandwiches with hexagonal patterns of free-form bulge geometries are investigated through finite element analysis for the maximum increase in stiffness over the normal flat sheets. The analysis shows that a bending stiffness increase of up to 13 times over flat sheet of the same mass is attainable by corrugated sandwiches. Further, it is proved for these types of corrugation sandwiches that stiffness increases by increasing the height of the corrugation bulge but that hydroforming poses restrictions with respect to bulge height, since it is limited by forming force and formability of the material. Incremental sheet metal forming can be used to produce sheets with a hexagonal bulge pattern with increased height. Hence, a higher increase in stiffness as compared to hydroforming is possible but at the expense of process speed.

  12. Study on rail corrugation of a metro tangential track with Cologne-egg type fasteners

    Science.gov (United States)

    Cui, X. L.; Chen, G. X.; Yang, H. G.; Zhang, Q.; Ouyang, H.; Zhu, M. H.

    2016-03-01

    In Chinese metro lines, rail corrugation on both tangential and tight curved tracks with Cologne-egg type fasteners is very severe. Based on the viewpoint of friction-induced vibration causing rail corrugation, the rail corrugation on a tangential track with Cologne-egg type fasteners is studied in this paper. A vibration model of an elastic multiple-wheelset-track system with Cologne-egg type fasteners is established. Both the complex eigenvalue analysis and the transient dynamic analysis are performed to study the stability and the dynamic performance of the wheelset-track system. The simulation results show that a low rail support stiffness value is responsible for rail corrugation on the tangential track. When the Cologne-egg fasteners characterised by a lower stiffness value are replaced with the DTVI2 fasteners characterised by a higher stiffness value, rail corrugation disappears. However, rail corrugation on tight curved tracks cannot be suppressed using the same replacement. The above conclusions are consistent with the corrugation occurrences in actual metro tracks.

  13. Modeling of a corrugated dielectric elastomer actuator for artificial muscle applications

    Science.gov (United States)

    Kadooka, Kevin; Taya, Minoru; Naito, Keishi; Saito, Makoto

    2015-04-01

    Dielectric elastomer actuators have many advantages, including light weight, simplicity, high energy density, and silent operation. These features make them suitable to replace conventional actuators and transducers, especially in artificial muscle applications where large contractile strains are necessary for lifelike motions. This paper will introduce the concept of a corrugated dielectric elastomer actuator (DEA), which consists of dielectric elastomer (DE) laminated to a thin elastic layer to induce bending motion at each of the corrugations, resulting in large axial deformation. The location of the DE and elastic layers can be configured to provide tensile or compressive axial strain. Such corrugated DE actuators are also highly scalable: linking multiple actuators in series results in greater deformation, whereas multiple actuators in parallel results in larger force output. Analytical closed-form solutions based on linear elasticity were derived for the displacement and force output of curved unimorph and corrugated DEA, both consisting of an arbitrary number of lamina. A total strain energy analysis and Castigiliano's theorem were used to predict the nonlinear force-displacement behavior of the corrugated actuator. Curved unimorph and corrugated DEA were fabricated using VHB F9469PC as the DE material. Displacement of the actuators observed during testing agreed well with the modeling results. Large contractile strain (25.5%) was achieved by the corrugated DEA. Future work includes investigating higher performance DE materials such as plasticized PVDF terpolymers, processed by thin film deposition methods.

  14. Prototype testing of heat pipes for spacecraft heat control systems

    Energy Technology Data Exchange (ETDEWEB)

    Vasil' ev, L.L.; Gil, V.V.; Zharikov, N.A.; Zelenin, V.E.; Syvorotka, O.M.; Uvarov, E.I.

    1980-05-01

    Prototype testing of heat pipes for spacecraft heat control was done on board the Interkosmos-15 satellite launched on 19 June 1976. The purpose was to gather data for optimizing the design, namely the capillary structure and the selection of heat transfer agent, as well as to verify the soundness of manufacturing technologies and test procedures. Three heat pipes were tested, each 412 mm long with a 14 mm outside diameter. All had been made of an aluminum alloy. In two pipes the capillary structure consisted of 0.6 x 0.5 mm/sup 2/ rectangular channels running axially along the inside wall, in the third pipe a 1 mm thick tubular mesh of Kh18N10T steel wire running coaxially inside served as the capillary structure. The heat transfer agent was Freon-11 in one of the first two pipes and synthetic liquid ammonia in the other two pipes. The three pipes were mounted radially around a radiator as the hub, with the test conditions controllable by means of an electric heater coil along the evaporation zone of each pipe, resistance thermometers for the evaporation zone and for the condensation zone of each, and also an external cooling fan. The radial distribution of temperature drops along the pipes was measured and the thermal fluxes were calculated, these data being indicative of the performance under conditions of weightlessness over the 0 to 70/sup 0/C temperature range. The somewhat worse performance of the heat pipe with a tubular capillary mesh inside is attributable to formation of vapor bubbles which impede the mass transfer along such an artery.

  15. Bending of pipes with inconel cladding; Curvamento de tubos revestidos com inconel

    Energy Technology Data Exchange (ETDEWEB)

    Nachpitz, Leonardo; Menezes, Carlos Eduardo B.; Vieira, Carlos R. Tavares [PROTUBO, Macae, RJ (Brazil)

    2008-07-01

    The pipes used in offshore equipment, such as wet Christmas trees, sub sea manifolds and rigid platform risers, as well as some pipes for refineries and ships, must have mechanical resistance to high pressure and also be resistant to corrosion from acids. Some special materials, such as stainless steel, duplex and super duplex steel are used to resolve this problem, but the cost is very high. Besides the problem of cost, these materials have other drawbacks, such as the difficulty of welding them, a technology mastered in few countries. As a better alternative, the use has been increasing of carbon steel and API pipes coated internally with inconel by welding deposition. This groundbreaking technology, of proven efficiency, has a far superior cost-benefit relation. Carbon steel and API pipes, besides having better mechanical resistance to high pressure and corrosion resistance, can be fabricated with technology mastered worldwide. Nickel alloys, such as inconel, are highly resistant to corrosion and temperature, and in these aspects are better than stainless steels. The pipes for transportation equipment and for refining hydrocarbons, as mentioned above, require various turns and special geometries, which generally are solved by the use of bends and spools made by high-frequency induction. This technology, already well established for various carbon and stainless steels, was developed to work with pipes coated internally with inconel (inconel cladding). Therefore, our work describes the process of fabricating bends from API steel pipes with inconel cladding, demonstrating the efficacy of this technology along with its quality gains and cost reduction. (author)

  16. 78 FR 25253 - Seamless Carbon and Alloy Steel Standard, Line, and Pressure From the People's Republic of China...

    Science.gov (United States)

    2013-04-30

    ... From the Federal Register Online via the Government Publishing Office DEPARTMENT OF COMMERCE International Trade Administration Seamless Carbon and Alloy Steel Standard, Line, and Pressure From the People... seamless carbon and alloy steel standard, line, and pressure pipe ] (``seamless pipe'') from the...

  17. Numerical investigation of the aerodynamic and structural characteristics of a corrugated wing

    Science.gov (United States)

    Hord, Kyle

    Previous experimental studies on static, bio-inspired corrugated wings have shown that they produce favorable aerodynamic properties such as delayed stall compared to streamlined wings and flat plates at high Reynolds numbers (Re ≥ 4x104). The majority of studies have been carried out with scaled models of dragonfly forewings from the Aeshna Cyanea in either wind tunnels or water channels. In this thesis, the aerodynamics of a corrugated airfoil was studied using computational fluid dynamics methods at a low Reynolds number of 1000. Structural analysis was also performed using the commercial software SolidWorks 2009. The flow field is described by solving the incompressible Navier-Stokes equations on an overlapping grid using the pressure-Poisson method. The equations are discretized in space with second-order accurate central differences. Time integration is achieved through the second-order Crank-Nicolson implicit method. The complex vortex structures that form in the corrugated airfoil valleys and around the corrugated airfoil are studied in detail. Comparisons are made with experimental measurements from corrugated wings and also with simulations of a flat plate. Contrary to the studies at high Reynolds numbers, our study shows that at low Reynolds numbers the wing corrugation does not provide any aerodynamic benefit compared to a smoothed flat plate. Instead, the corrugated profile generates more pressure drag which is only partially offset by the reduction of friction drag, leading to more total drag than the flat plate. Structural analysis shows that the wing corrugation can increase the resistance to bending moments on the wing structure. A smoothed structure has to be three times thicker to provide the same stiffness. It was concluded the corrugated wing has the structural benefit to provide the same resistance to bending moments with a much reduced weight.

  18. Transition from diffusive to localized regimes in surface corrugated waveguides

    Energy Technology Data Exchange (ETDEWEB)

    Garcia-Martin, A.; Saenz, J. J. [Universidad Autonoma de Madrid, Madrid (Spain); Nieto-Vesperinas, M. [Instituto de Ciencias de Materiales de Madrid, Madrid (Spain)

    2001-03-01

    Exact calculations of transmission and reflection coefficients in surface randomly corrugated waveguides are presented. The elastic scattering of diffuse light classical waves from a rough surface induces a diffusive transport along the waveguide axis. As the length of the corrugated part of the waveguide increases, a transition from the diffusive to the localized regime is observed. This involves an analogy with electron conduction in nano wires, and hence, a concept analogous to that of resistance can be introduced. An oscillatory behavior of different transport properties (elastic mean free path, localization length, enhanced backscattering), versus the wavelength is predicted. An analysis of the transmission coefficients (transmitted speckle) shows that as the length of the corrugated part of the waveguide increases there is a strong preference to forward coupling through the lowest mode. This marks a clear anisotropy in the forward propagation which is absent in the case of volume disorder. The statistics of reflection coefficients is analyzed, first using random matrix theory (Rm) to analytically deduce the probability densities in the localization regime, afterwards exact numerical calculations of the coupling to backward modes in surface corrugated waveguides will be put forward for comparison. We show that the reflected speckle distribution are independent of the transport regime, at variance with the regime transition found in the transmission case. Despite the strong anisotropy, the analysis of the probability distributions of both transmitted and reflected waves confirms the distributions predicted by Random Matrix Theory for volume disorder. [Spanish] Presentamos calculos exactos de los coeficientes de transmision y reflexion en guias de onda con desorden de superficie. La dispersion elastica de luz difusa o de otras ondas clasicas por una superficie rugosa induce un transporte difusivo a lo largo del eje de la guia. A medida que la longitud de la zona

  19. Modeling noncontact atomic force microscopy resolution on corrugated surfaces

    Directory of Open Access Journals (Sweden)

    Kristen M. Burson

    2012-03-01

    Full Text Available Key developments in NC-AFM have generally involved atomically flat crystalline surfaces. However, many surfaces of technological interest are not atomically flat. We discuss the experimental difficulties in obtaining high-resolution images of rough surfaces, with amorphous SiO2 as a specific case. We develop a quasi-1-D minimal model for noncontact atomic force microscopy, based on van der Waals interactions between a spherical tip and the surface, explicitly accounting for the corrugated substrate (modeled as a sinusoid. The model results show an attenuation of the topographic contours by ~30% for tip distances within 5 Å of the surface. Results also indicate a deviation from the Hamaker force law for a sphere interacting with a flat surface.

  20. An Ant Colony Optimization Algorithm for Microwave Corrugated Filters Design

    Directory of Open Access Journals (Sweden)

    Ivan A. Mantilla-Gaviria

    2013-01-01

    Full Text Available A practical and useful application of the Ant Colony Optimization (ACO method for microwave corrugated filter design is shown. The classical, general purpose ACO method is adapted to deal with the microwave filter design problem. The design strategy used in this paper is an iterative procedure based on the use of an optimization method along with an electromagnetic simulator. The designs of high-pass and band-pass microwave rectangular waveguide filters working in the C-band and X-band, respectively, for communication applications, are shown. The average convergence performance of the ACO method is characterized by means of Monte Carlo simulations and compared with that obtained with the well-known Genetic Algorithm (GA. The overall performance, for the simulations presented herein, of the ACO is found to be better than that of the GA.