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某新建的273.1mm×6.0mmX52ERW输油管道在试压过程中发生了多起爆裂事故。对输油管道爆裂事故进行了深入的调查研究,对爆裂的管线管断口和裂纹进行了宏观分析和微观分析,对管线管焊缝质量和材质进行了全面试验分析。认为管线管爆裂原因主要是在电阻焊过程中工艺不当,产生了未焊透缺陷和裂纹,在试压过程中管线管从这些原始的焊接缺陷位置发生了爆裂事故。采用失效评估诊断技术和Mente-Carlo失效概率技术对试压合格的管线进行了适用性评价(Fitness-forser-vice),认为管线管经过压力试验后仍存在小的未焊透缺陷和裂纹,带有这些焊接缺陷的管线按设计的压力运行可能会发生爆裂事故,因此该管线应当降压运行。经过分析给出了该管线最大运行压力。
A new 273.1mm × 6.0mmX52ERW pipeline during the pressure test occurred more than one burst accident. The pipeline burst accident was investigated in depth. The ruptured pipeline fracture and crack were analyzed macroscopically and microscopically. The quality and material quality of pipeline weld were comprehensively tested. It is considered that the main reason for pipeline burst is improper process in resistance welding process, which results in impermeable defects and cracks. In the process of pressure test, pipeline pipe burst from these original welding defects. Fitness-forser-vice was applied to evaluate the qualified pipelines by using the failure assessment diagnostic technique and the Mente-Carlo failure probability technique. It is concluded that there are still some minor defects and cracks in the pipeline after the pressure test. A pipe with these weld defects may burst at a design pressure and therefore should be depressurised. After analysis gives the maximum operating pressure of the pipeline.