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Energies 2018, 11(9), 2334; https://doi.org/10.3390/en11092334

Stress and Deformation Analysis of Buried Gas Pipelines Subjected to Buoyancy in Liquefaction Zones

1,2
and
1,2,*
1
College of Mechanical and Transportation Engineering, China University of Petroleum-Beijing, Beijing 102249, China
2
National Engineering Laboratory for Pipeline Safety, Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum-Beijing, Beijing 102249, China
*
Author to whom correspondence should be addressed.
Received: 8 August 2018 / Revised: 29 August 2018 / Accepted: 4 September 2018 / Published: 4 September 2018
(This article belongs to the Section Energy Storage and Application)
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Abstract

Buried pipelines are the main means of long distance transportation of natural gas. These pipelines are in high risk crossing liquefaction areas due to large deformations and stresses that may exist in pipe induced by the buoyancy load. In this study, a systematic analytical and numerical analysis were performed to investigate the mechanical behavior of a buried gas pipeline subjected to buoyancy in liquefaction areas. Soil constraints on pipe were considered accurately in the proposed models through soil spring assumptions. Effects of axial forces on pipe’s bending deformation were also considered via the governing equations for beam under bending and tension. Deformation compatibility condition was utilized to derive the axial forces in pipe. The accuracy of the proposed analytical model was validated by comparing its results with those derived by an established rigorous finite element model. In addition, parametric analysis was finally performed using the analytical model to study the influences of pipe diameter, pipe wall thickness, soil spring stiffness and width of liquefaction zone on pipe’s mechanical responses. This study can be referenced in the strength analysis and performance based safety evaluation of buried gas pipelines crossing liquefaction areas. View Full-Text
Keywords: gas pipeline; stress; buoyancy load; liquefaction area; analytical method; finite element method gas pipeline; stress; buoyancy load; liquefaction area; analytical method; finite element method
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Xia, M.; Zhang, H. Stress and Deformation Analysis of Buried Gas Pipelines Subjected to Buoyancy in Liquefaction Zones. Energies 2018, 11, 2334.

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