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PRELIMINARY FAILURE ASSESSMENT FOR SPIRAL WELDED DEFECTS OF PIPELINE

机译：管道螺旋焊接缺陷的初步故障评估

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The spiral welded defect of steel oil transmission pipeline is one of the main causes resulting in pipeline leakage accident. Hence the failure assessment for known-size spiral welded defects is an important step to ensure the safety of defected pipeline. Lack of suitable criterion for assessing the spiral welded manufacture defects of pipeline network in China, is a difficult technology problem to be solved desirably. This paper first summarized the basic idea of preliminary failure assessment (Grade 1A of code BS 7910:2005) with some insight of our own understanding, and then applied the preliminary failure assessment to the spiral welded defects of oil pipeline, with the use of ultrasonic inspection data of Daqing-Tieling old pipeline from LingYuan to XinMiao, Northeastern China. The calculation of both fracture and plastic collapse failure for spiral welded defects indicates some detected flaws of pipeline are not safe as the internal pressure is greater than 4.5 MPa. A leakage accident of spiral welded pipeline in Western China is also assessed through fractography analyses and failure calculations. This paper concludes that the preliminary failure assessment provides useful outcome for reference in making decision of inspection, integrity assessment and repair of spiral welded pipeline, and hence is a step of fundamental importance and practical significance before more accurate data becomes available for higher grade assessment.
机译：钢油传输管道的螺旋焊接缺陷是导致管道泄漏事故的主要原因之一。因此，已知型螺旋焊接缺陷的故障评估是确保缺陷管道安全的重要步骤。缺乏评估中国管网管网络螺旋焊接制造缺陷的合适标准，是一个难以解决的技术问题。本文首先总结了初步失败评估的基本思想（编码BS 7910：2005年级），对我们自己的理解有所了解，然后将初步失败评估应用于石油管道的螺旋焊接缺陷，使用超声波从凌源到中国东北林源到新淼的大庆 - 泰林旧管道检验数据。螺旋焊接缺陷的裂缝和塑料塌陷失效的计算表明，由于内部压力大于4.5MPa，因此一些检测到的管道缺陷不安全。中国西部螺旋焊接管道的泄漏事故也通过Fractography分析和故障计算来评估。本文得出结论，初步故障评估为决策，螺旋焊接管道的检验，完整性评估和修复提供了有用的结果，因此是在更准确的数据可用于更高等级评估之前的重要性和实际意义的一步。

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