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| Statistics and Cause Analysis of Gas Leakage in Urban Polyethylene Gas Pipelines |
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| DOI：10.7643/issn.1672-9242.2023.04.014 |
| KeyWord:polyethylene gas pipeline gas leakage weak part service life |
| Author | Institution |
| LI Xia-xi |
Beijing Gas Group Co., Ltd., Beijing , China |
| XING Lin-lin |
Beijing Gas Group Co., Ltd., Beijing , China |
| TIAN Xiao-jiang |
Beijing Gas Group Co., Ltd., Beijing , China |
| GAO Guan-ling |
Beijing Gas Group Co., Ltd., Beijing , China |
| LIU Min |
Beijing Gas Group Co., Ltd., Beijing , China |
| XU Qing-qing |
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China |
| GAO Jin |
Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China |
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| Abstract: |
| The work aims to analyze the weak parts and causes that affect the gas leakage of polyethylene gas pipelines and provide practical data support for the feasibility analysis of the evaluation method for safe service of polyethylene gas pipelines. 290 cases of gas leakage in the practical application of polyethylene gas pipelines in Beijing were collected and summarized to make statistical analysis from the aspects of failed and weak parts, service years, months, etc., and discuss the main causes for gas leakage of polyethylene gas pipelines. The steel-plastic conversion sites, sleeves, welding positions and other connection positions of PE gas pipelines in safe service were the weak parts of PE gas pipelines in service. The service life was proportional to the proportion of gas leakage cases, and the sensitive months of each part were quite different. Through analysis, the main factors affecting pipeline service were determined as the long-term coupling effect of environment/stress and the sudden effect of external force. The organic acid medium existing in the soil environment will accelerate the aging of the pipelines, especially for the inherent weak defects caused by construction, surface damage caused by external factors, stress concentration, etc. Under the coupling action of chemical medium, temperature and operating pressure in the soil service environment, the performance of the pipelines is greatly reduced, resulting in gas leakage accidents, which poses a great threat to safe operation. |
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