Pipeline is the common mode for transporting oil, gas, and various petroleum products. Buried linepipe can be exposed to various external interferences and corrosive environment and as a result, damage in the form of dent or corrosion or crack or gouge or combination of any of these damages can form in the pipe wall. Such damage or combined damages can reduce the pressure capacity of the pipeline. A defect combining dent and crack, often known as dent-crack defect, can develop in the wall of a buried oil and gas linepipe. This combined defect may lead to a leak or a rupture in the pipe wall and hence, the pipeline operator becomes concerned about the performance and safety of the pipeline when a dent-crack defect is detected in the field pipeline. A long-term research program is currently underway at the Centre for Engineering Research in Pipelines, University of Windsor to study the influence of various parameters such as dent depth and operating line pressure on the pressure capacity or burst strength of 30 inch diameter and X70 grade pipes with D/t of about 90. From the study completed so far, it has been found that the dent depth of 8% with crack depth of 4 mm or more can reduce the pressure capacity by 32%. This paper discusses the test specimens, test setup, test procedure, test results, and data obtained from finite element analyses.
展开▼
机译：管道是运输石油，天然气和各种石油产品的常用方式。埋入的管道可能会受到各种外部干扰和腐蚀环境的影响，结果会在管道壁上形成凹痕，腐蚀或裂缝或凿痕形式的损坏，或所有这些损坏的组合。这种损坏或组合损坏会降低管道的承压能力。凹痕和裂纹相结合的缺陷（通常称为凹痕裂纹缺陷）会在地下油气管道的壁中形成。这种组合的缺陷可能导致管壁泄漏或破裂，因此，当在现场管道中检测到凹痕缺陷时，管道操作员会担心管道的性能和安全性。温莎大学管道工程研究中心目前正在进行一项长期研究计划，以研究各种参数（例如凹痕深度和工作管线压力）对30英寸直径和X70等级的压力容量或爆破强度的影响。 D / t约为90的管道。迄今为止完成的研究发现，凹痕深度为8％，裂纹深度为4 mm或更大，可使压力承受能力降低32％。本文讨论了测试样本，测试设置，测试程序，测试结果以及从有限元分析中获得的数据。
展开▼
