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首页> 外文会议>ASME international pipeline conference 2008 >PRELIMINARY FAILURE ASSESSMENT FOR SPIRAL WELDED DEFECTS OF PIPELINE
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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 usefulrnoutcome 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：输油管道的螺旋焊接缺陷是造成管道泄漏事故的主要原因之一。因此，对已知尺寸的螺旋焊接缺陷进行失效评估是确保缺陷管道安全的重要步骤。缺乏合适的标准来评价我国管网螺旋焊接制造缺陷，是一个亟待解决的技术难题。本文首先总结了初步的故障评估的基本思想（代码BS 7910：2005的1A级），并根据自己的理解，然后将初步的故障评估应用到输油管道的螺旋焊接缺陷中，并使用了超声波技术凌源至新庙的大庆-铁岭老管道检测数据。对螺旋焊接缺陷的断裂和塑性破坏破坏的计算表明，由于内部压力大于4.5 MPa，一些检测到的管道缺陷是不安全的。通过断层分析和破坏计算，评估了中国西部螺旋焊接管道的泄漏事故。本文的结论是，初步的失效评估为螺旋焊管道的检查，完整性评估和维修决策提供了有益的参考，因此是在获得更准确的数据用于更高等级评估之前的一个基础性的步骤和实际意义。

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