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Acceptance criteria of defects in undersea pipeline using internal inspection

机译:使用内部检查的海底管道缺陷验收标准

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The purpose of this paper is to establish acceptance criteria for interpretation of the internal inspection results of undersea pipelines. There are no specific rules or guidelines for the acceptance criteria of existing pipelines using a certain internal inspection method. Acceptable criteria were established with a case study of a 609.6 mm (24 in.) diameter, concrete weight coated pipeline delivers fuel oil to a thermal power plant, Ghana. Parameters to be considered in the uncertainties of flaw sizing include the crack length, depth, orientation of the flaw, whether or not the flaw is surface breaking, and number of flaws. Fitness-for-services of other pipelines can be determined using the established criteria in this study. The method of inspection also affects the acceptance criteria. Imposing limitations at or beyond the limits of detection capability would obviously be counter-productive.
机译:本文的目的是建立用于解释海底管道内部检查结果的验收标准。对于使用某种内部检查方法的现有管道的验收标准,没有特定的规则或准则。通过对直径为609.6毫米(24英寸)的混凝土配重涂层管道进行案例研究,建立了可接受的标准,该管道将燃料油输送至加纳的热电厂。缺陷尺寸不确定性中要考虑的参数包括裂纹长度,深度,缺陷方向,缺陷是否为表面破裂以及缺陷数量。可以使用本研究中已建立的标准来确定其他管道的适用性。检查方法也会影响验收标准。将限制强加到或超过检测能力的限制显然会适得其反。

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