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针对某长输天然气管道河流穿越管段爆裂失效事故,通过断口形貌、无损检测、化学成分、微观组织、力学性能分析以及有限元模拟计算等方法,进行事故原因分析。结果表明:该管段在穿越施工空管回拖过程中因承受某种集中载荷作用而使管体局部受力发生形变,产生局部屈曲失稳;该失稳管段在输气运行过程中,屈曲形变部位存在明显的应力集中,导致管体外壁形变硬化处的微裂纹扩展并失效。因此,管体失稳至裂纹扩展及防腐层破裂是管体泄漏失效爆裂的主要原因。(表4,图13,参15)
Aiming at the burst failure of a long-distance natural gas pipeline crossing through the pipe section, the cause of the accident was analyzed through fracture morphology, non-destructive testing, chemical composition, microstructure, mechanical property analysis and finite element simulation calculation. The results show that local buckling of the pipe body occurs when the pipe is subjected to some concentrated load during the trailing drag of the empty pipe. The buckling of the pipe is buckling There is a significant stress concentration in the site, resulting in deformation and hardening of microcracks at the outer wall deformation and failure. Therefore, the tube body instability until the crack growth and the coating rupture is the main reason for burst failure of the pipe body. (Table 4, Figure 13, reference 15)