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某埋地天然气管道发生泄漏事故,检查发现是一对接焊接接头开裂,裂纹长50mm,开挖时整条焊缝断裂。从管道焊接、安装、无损检测、管沟施工、设计使用等方面综合分析,提出管道开裂失效的主要原因是管道安装时施工质量失控所致。排查整条管道,拟定两种返修方案并比较优劣,确定采用金属波纹膨胀节进行返修。总结经验,提出安装监检时的一些建议。
A buried gas pipeline leaks, inspection found to be a butt welded joint cracking, crack length 50mm, the entire weld fracture. From the comprehensive analysis of pipeline welding, installation, non-destructive testing, trench construction, design and use, the main reason for the failure of pipeline cracking is that the quality of construction is lost due to pipeline installation. Investigate the entire pipeline, draw up two kinds of rework program and compare the pros and cons, determine the use of corrugated metal expansion joints for repair. Summarized the experience, put forward some recommendations when installing monitoring.