Application of a finite element method to stress distribution in buried patch repaired polyethylene gas pipes

Khademi-Zahedi, Reza; Shishesaz, Mohammad

doi:10.1016/j.undsp.2018.05.001

Cited by 15 publications

(12 citation statements)

References 31 publications

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“…The geometry and the installation procedure of the socket jointed polyethylene pipe are similar to that of normally buried polyethylene pipe which is well described [8][9][10][11][12]. Therefore, the same temperature variations for the buried pipe impose to the socket too.…”

Section: Results Of Finite Element Solution For the Socket Jointed Bumentioning

confidence: 99%

“…For the following section of this research, the value of 1.5 is selected for the design coefficient (factor of safety). Considering the operating temperature of 35 • C for underground pipes buried at a depth of 125 cm, based on climate conditions in hot areas and Ahvaz city [8][9][10][11][12][13]20], according to the reported minimum strength value for polyethylene PE100 material [21], the design stress (maximum allowable stress) for this research is 5.4 MPa. Additionally, this value of design stress is calculated to be 4.3 MPa for the PE80 pipe material.…”

Section: Evaluation Of the Resultsmentioning

confidence: 99%

“…The mechanical properties of the backfill environment or embedment should meet the special structural application. The mechanical properties of the soil grades used for bedding, haunching, initial and final backfill and also asphalt cover, along with installation dimensions are selected based on references [8][9][10][11]. Additionally similar loading conditions are introduced and imposed.…”

Section: Basic Design Theorymentioning

confidence: 99%

“…The socket material for joining MDPE buried gas pipes was selected from the PE100. Based on references [8][9][10][11] PE80 material was selected for the pipe. In order to investigate the stress distribution in a pressurized PE gas pipe, the value of 11 was selected for pipe and its socket SDR (Standard dimension ratio) Geometrical and mechanical properties of PE100 socket material are presented in Table 1 [17].…”

Section: Stress Investigation In Socket Joint Of Buried Polyethylene mentioning

confidence: 99%

“…Abaqus and Ansys software has been used by several researchers for three-dimensional modeling of the aforementioned structures. In this research, the methods discussed in contributions on finite element modeling of buried polyethylene gas pipes which can be found in references [8][9][10][11][12][13] are used to further investigate the stress distribution in special cases of buried polyethylene gas pipe problems which are subjected to the local geometry changes compared to simple buried pipes. This study can be divided in two parts.…”

Section: Introductionmentioning

confidence: 99%

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Finite Element Analysis to the Effect of Thermo-Mechanical Loads on Stress Distribution in Buried Polyethylene Gas Pipes Jointed by Electrofusion Sockets, Repaired by PE Patches

Khademi-Zahedi

Alimouri

2018

Energies

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Polyethylene (PE) gas pipes can be jointed together by electrofusion PE fittings, which have sockets that are fused onto the pipe. Additionally, electrofused PE patches can be used to repair defected pipes. When these pipelines are buried under the ground, they can experience sever local stresses due to the presence of pipe joints, which is superimposed on the other effects including the soil-structure interaction, traffic load, soil’s column weight, a uniform internal pressure, and thermal loads imposed by daily and/or seasonal temperature changes. The present contribution includes two cases. At first, stress variations in buried polyethylene gas pipe and its socket due to the aforementioned loading condition is estimated using finite element. The pipe is assumed to be made of PE80 material and its jointing socket material is PE100. Afterward, the effects of aforementioned thermo-mechanical loads on the stress distribution in patch repaired buried pipes are well investigated. The soil physical properties and the underground polyethylene pipe installation method are based on the American association of state highway and transportation officials and American society for testing and material standards. The computer simulation and analysis of stresses are performed through the finite element package of ANSYS Software. Stress concentrations can be observed in both components due to the presence of the socket or the repair patch. According to the results, the electrofusion sockets can be used for joining PE gas pipes even in hot climate areas. The maximum values of these stresses happen to be in the pipe. Also, the PE100 socket is more sensitive to a temperature drop. Additionally, all four studied patch arrangements show significant reinforcing effects on the defected section of the buried PE gas pipe to withstand applied loads. Meanwhile, the defected buried medium density polyethylene (MDPE) gas pipe and its saddle fused patch can resist the imposed mechanical and thermal loads of +22 °C temperature increase.

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Section: Results Of Finite Element Solution For the Socket Jointed Bumentioning

confidence: 99%

Section: Evaluation Of the Resultsmentioning

confidence: 99%

Section: Basic Design Theorymentioning

confidence: 99%

Section: Stress Investigation In Socket Joint Of Buried Polyethylene mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Finite Element Analysis to the Effect of Thermo-Mechanical Loads on Stress Distribution in Buried Polyethylene Gas Pipes Jointed by Electrofusion Sockets, Repaired by PE Patches

Khademi-Zahedi

Alimouri

2018

Energies

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Investigation of Polyethylene Pipeline Behavior after 30 Years of Use in Gas Distribution Network

Bachir-Bey

Belhaneche‐Bensemra

2020

J. of Materi Eng and Perform

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Finite element model updating of a large structure using multi-setup stochastic subspace identification method and bees optimization algorithm

Khademi-Zahedi

Alimouri

2019

Front. Struct. Civ. Eng.

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Application of a finite element method to stress distribution in buried patch repaired polyethylene gas pipes

Cited by 15 publications

References 31 publications

Finite Element Analysis to the Effect of Thermo-Mechanical Loads on Stress Distribution in Buried Polyethylene Gas Pipes Jointed by Electrofusion Sockets, Repaired by PE Patches

Finite Element Analysis to the Effect of Thermo-Mechanical Loads on Stress Distribution in Buried Polyethylene Gas Pipes Jointed by Electrofusion Sockets, Repaired by PE Patches

Investigation of Polyethylene Pipeline Behavior after 30 Years of Use in Gas Distribution Network

Finite element model updating of a large structure using multi-setup stochastic subspace identification method and bees optimization algorithm

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