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Investigating peak stresses in fitting and repair patches of buried polyethylene gas pipes

Frontiers of Structural and Civil Engineering 2020年第1期14卷 147-168页

作者： Reza KHADEMI ZAHEDI Pouyan ALIMOURI Hooman KHADEMI ZAHEDI Mohammad SHISHESAZ Institute of Structural Mechanics Bauhaus-Universitat WeimarMariensrtaβe 15Weimar 99423Germany Mechanical Engineering Department Shahid Chamran University of AhvazAhvazIran Mechanical Engineering Department Islamic Azad UniversityNorth Tehran BranchIran

Nowadays,polyethylene composes a large number of natural gas distribution pipelines installed under the ground.The focus of the present contribution is two fold.One of the objectives is to investigate the applicability of polyethylene fittings in joining polyethylene gas pipes which are electrofused onto the pipe ends and buried under the ground,by estimating stress distribution using finite element method.The second objective is to study the effectiveness of polyethylene repair patches which are used to mend the defected pipelines by performing a finite element analysis to calculate peak stress values.Buried polyethylene pipelines in the natural gas industry,can be imposed by sever loadings including the soil-structure interaction,traffic load,soil’s column weight,internal pressure,and thermal loads resulting from daily and/or seasonal temperature changes.Additionally,due to the application of pipe joints,and repair patches local stresses superimposed on the aforementioned loading effects.The pipe is assumed to be made of PE80 resin and its jointing socket,and the repair patch is PE100 material.The computational analysis of stresses and the computer simulations are performed using ANSYS commercial software.According to the results,the peak stress values take place in the middle of the fitting and at its internal surface.The maximum stress values in fitting and pipe are below the allowable stresses which shows the proper use of introduced fitting is applicable even in hot climate areas of Ahvaz,Iran.Although the buried pipe is imposed to the maximum values of stresses,the PE100 socket is more sensitive to a temperature drop.Furthermore,all four studied patch arrangements show significant reinforcing effects on the defected section of the buried PE gas pipe to transfer applied loads.Meanwhile,the defected buried medium density polyethylene gas pipe and its saddle fused patch can resist the imposed mechanical and thermal loads of 22℃ temperature increase.Moreover,increasing the saddle fusion patch length to 12 inch

关键词： Ansys software polyethylene buried pipelines polyethylene joints polyethylene patches peak von Mises stress soil-pipe interaction temperature variation

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Evaluation of Water Distribution Jointed pipe Networks under Transient Ground Motions

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Open Journal of Civil Engineering 2015年第2期5卷 190-202页

作者： Alireza Boorboor Mahmood Hosseini Department of Structure International Institute of Earthquake Engineering and Seismology Tehran Iran

In this study, a new method is proposed to evaluate the seismic behavior of buried jointed water pipeline networks subjected to wave propagation. First, using finite element method and solid elements, different kinds of currently used connections in the network are modeled, and their nonlinear behavior in all directions is obtained. Second, a 950-meter long network consisting of ductile iron pipes segments of 6-meter length and springs characterizing the connections, are modeled using beam elements. Three-component displacement record of the Tabas earthquake is applied to the network considering the time lag between support inputs, and the nonlinear soil-pipe interaction. The record is applied once in North-South direction and once in East-West direction with different wave propagation velocities. Results of interest such as stress values and rotations at various points of the network are then obtained, and critical points are introduced in each direction. Results show that the points other than the critical ones at the network intersections remain elastic.

关键词： Finite Element Method Ductile Iron Connections Three Component Displacement Records Nonlinear soil-pipe Interaction

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Sensitivity Analysis of Buried Jointed pipelines Subjected to Earthquake Waves

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Open Journal of Earthquake Research 2015年第2期4卷 74-84页

作者： Alireza Boorboor Mahmood Hosseini Department of Structure International Institute of Earthquake Engineering and Seismology Tehran Iran

In this study, a number of nonlinear time-history dynamic analyses are conducted on a part of Tehran water distribution network to investigate its functionality during transient large ground motions. The network is of 950-meter length, consisting of ductile iron pipes segments of 6-meter length. pipes are modeled using beam elements and springs characterize the connections. Considering the time lag between support inputs, and the nonlinear soil-pipe interaction, by scaling the amplitude of the Tab as earthquake record, incremental dynamic analysis is carried out on the network in two orthogonal directions and the sensitivity of the network response is examined. Furthermore, the effects of variations in soil damping and soil spring stiffness are also studied in the network analysis. Finally the effect of changes in angle between incoming wave and pipeline is considered on a simplified network. Results show that the points other than critical ones at network intersections remain almost intact and when the angle of incidence is 30 degrees the stress and rotation peak.

关键词： Jointed Buried pipelines Multisupport Excitation Three Component Displacement Records Nonlinear soil-pipe Interaction Finite Element Method

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