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首页> 外文期刊>Engineering failure analysis >Crack and fitness-for-service assessment of ERW crude oil pipeline
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Crack and fitness-for-service assessment of ERW crude oil pipeline

机译：ERW原油管道的裂缝和适用性评估

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摘要

Twelve crack accidents took place on a 273.1X 6 mm CHI52 ERW newly built crude oil pipeline during air pressure tests. This paper gives a detailed investigation on the crack accidents. Macro-fractography and micro-fractography of cracked line pipes were conducted, and the quality of the weld and pipe body were inspected. It was found that the main cause of line pipe failures at the weld was lack of fusion defects and cracks produced by inadequate welding heat input in electric resistance welds (ERWs). Considering that there were still lack of fusion defects and cracks on the pipeline after internal pressure tests, a fitness-for service (FFS) assessment was performed for the pipeline by use of failure assessment diagram technology and Monte-Carlo technology of failure probability. It was showed from FFS that the pipeline could break under designed operating pressure, and the maximum operation pressure was predicted for the pipeline.
机译：在气压测试期间，在273.1X 6毫米CHI52 ERW新建原油管道上发生了十二次破裂事故。本文对裂纹事故进行了详细的调查。进行了裂纹管线的宏观分形和微观分形，并检查了焊缝和管体的质量。已发现，在焊缝处管线管道失效的主要原因是缺乏熔合缺陷，以及由于电阻焊（ERW）中焊接热量输入不足而产生的裂纹。考虑到内部压力测试后管道上仍缺乏熔合缺陷和裂纹，通过使用失效评估图技术和蒙特卡洛失效概率技术对管道进行了适用性评估（FFS）。从FFS可以看出，管道可能在设计的工作压力下破裂，并且可以预测管道的最大工作压力。

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