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<p>To clarify the failure mechanism of extremely long-service buried gas pipelines and propose preventive measures, a 20# steel buried gas collection pipeline that was put into operation in 1980 was selected as the research object. Systematic failure research was conducted through macroscopic observation, component analysis, mechanical property testing, metallographic examination, and SEM-EDS analysis. The results showed that the pipeline fracture was caused by the coupling effect of third-party mechanical impact, excessive non-metallic inclusions triggering electrochemical corrosion, and aging failure of the anti-corrosion coating. The composition, mechanical properties, and metallographic structure of the pipeline body all met the standard requirements, and there was no material deterioration. The rating of inclusions such as strip sulfides and chain-like aluminum oxide in the pipeline exceeded the standard, forming an electrolytic cell with the matrix to cause local electrochemical corrosion, which was the internal cause of the corrosion. The pipeline's service life exceeded 40&#xa0;years, resulting in the extensive detachment of the anti-corrosion layer, and the presence of sulfur and chlorine in the soil medium accelerated the thinning of the pipeline wall and significantly reduced its bearing capacity. The third-party mechanical impact caused a temporary overload, which ultimately triggered the sudden fracture of the pipeline. Based on the failure mechanism, targeted measures were proposed from four aspects: prevention of third-party damage, maintenance of the anti-corrosion system, control of the corrosion source, and management of geological loads. The research results can provide technical support for the integrity management and failure prevention of similar old pipelines.</p>

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Fracture Failure Analysis and Preventive Measures of Buried Gas Transmission Pipeline in a Gas Production Station

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Dong Li,
  • Lei Guo,
  • Yan Xu,
  • Bochao Hao,
  • Ren Tao,
  • Lei Guo,
  • Jinhui Wu

摘要

To clarify the failure mechanism of extremely long-service buried gas pipelines and propose preventive measures, a 20# steel buried gas collection pipeline that was put into operation in 1980 was selected as the research object. Systematic failure research was conducted through macroscopic observation, component analysis, mechanical property testing, metallographic examination, and SEM-EDS analysis. The results showed that the pipeline fracture was caused by the coupling effect of third-party mechanical impact, excessive non-metallic inclusions triggering electrochemical corrosion, and aging failure of the anti-corrosion coating. The composition, mechanical properties, and metallographic structure of the pipeline body all met the standard requirements, and there was no material deterioration. The rating of inclusions such as strip sulfides and chain-like aluminum oxide in the pipeline exceeded the standard, forming an electrolytic cell with the matrix to cause local electrochemical corrosion, which was the internal cause of the corrosion. The pipeline's service life exceeded 40 years, resulting in the extensive detachment of the anti-corrosion layer, and the presence of sulfur and chlorine in the soil medium accelerated the thinning of the pipeline wall and significantly reduced its bearing capacity. The third-party mechanical impact caused a temporary overload, which ultimately triggered the sudden fracture of the pipeline. Based on the failure mechanism, targeted measures were proposed from four aspects: prevention of third-party damage, maintenance of the anti-corrosion system, control of the corrosion source, and management of geological loads. The research results can provide technical support for the integrity management and failure prevention of similar old pipelines.