Stress Test and Analysis for Inlet and Outlet Pipeline System of the Station Under the Foundation Settlement

doi:10.11885/j.issn.1674-5086.2022.07.10.02

Abstract

Abstract: The foundation settlement easily leads to the stress concentration and excessive deformation of the inlet and outlet pipeline system of the natural gas station, and in severe cases, the pipeline may be damaged. To this end, a test platform for settlement stress testing of natural gas station inlet and outlet pipeline system including 2 typical structures of inlet and outlet lines, vent pipe and tee pipeline was built. Stress tests of different types of pipelines under foundation settlement were carried out. Based on the test platform, the three-dimensional model of the inlet and outlet pipeline system of the station was established to analyze the influence of internal pressure and diameter thickness ratio on pipeline stress. The results show that: the most serious bending deformation of the inlet and outlet line Ⅰ(buried manifold distribution structure) occurs at the ground elbow and the fixed position of the support, and the maximum tensile stress and compressive stress of the inlet and outlet line Ⅱ(Z-shaped structure) are both at the reducing tee of the pipe, the stress of the inlet and outlet line Ⅱ is smaller than that of the inlet and outlet line Ⅰ under the same settlement conditions; When the pier in the middle of the tee pipeline settles, and the stress of the pipeline at the inner side of the fixed supports at both ends and the settlement point far from the tee increases significantly with the settlement; When the ground-entry end of the vent pipe settles, and the vertical section of the ground-entry end has the most serious deformation, and the joint section between the vent pipe and the main pipeline receives the greatest stress. Reducing pipe diameter thickness ratio and operating internal pressure can reduce the equivalent stress during settlement and improve the pipeline safety. The research results provide a technical basis for the safety assessment, the selection of stress monitoring points and the settlement warning of the inlet and outlet pipeline system in natural gas station.

Key words: natural gas station, foundation settlement, inlet and outlet pipeline system of the station, stress test, stress analysis

CLC Number:

TE88

LIN Ruinan, YANG Hong, MAO Xuebin, HUANG Zhonghong, ZHANG Wen. Stress Test and Analysis for Inlet and Outlet Pipeline System of the Station Under the Foundation Settlement[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(2): 151-163.

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