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首页> 外文期刊>International journal of steel structures >Inspection and Maintenance Planning of Underground Pipelines Under the Combined Effect of Active Corrosion and Residual Stress
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Inspection and Maintenance Planning of Underground Pipelines Under the Combined Effect of Active Corrosion and Residual Stress

机译：主动腐蚀与残余应力共同作用下的地下管道检查与维修计划

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摘要

In this paper, a maintenance policy is proposed for pipelines subjected to active corrosion and residual stress, by taking into account imperfect inspection results. The degradation of the pipeline is induced by uniform corrosion, leading to losses of the pipe wall thickness. Localized corrosion is not considered herein, as neither pitting nor crevice corrosion are strongly influenced by external loading conditions and, hence, are not critical in structural strength considerations. When the corroded layers are removed, strain relaxation occurs, causing a redistribution of residual stresses. In parallel, the inspection is applied to detect the corrosion defects, namely the thickness of the corroded layer, and it has a detection threshold under which no corrosion rate can be measured. Due to uncertainties, each inspection is affected by the probability of detecting small defects and the probability of wrong assessment in terms of defect existence and size. The present work aims at integrating imperfect inspection results in the cost model for corroded pipelines, where the failure probabilities are computed by reliability methods. A numerical application on a gas pipe shows the influence of corrosion rates and residual stresses on the optimal maintenance planning.
机译：考虑到不完善的检查结果，本文提出了一种针对腐蚀和残余应力过大的管道的维护策略。管道的降解是由均匀腐蚀引起的，导致管道壁厚的损失。这里不考虑局部腐蚀，因为点蚀和缝隙腐蚀都不受外部载荷条件的强烈影响，因此，对结构强度的考虑并不重要。当腐蚀层被去除时，应变松弛发生，导致残余应力的重新分布。平行地，该检查用于检测腐蚀缺陷，即腐蚀层的厚度，并且具有检测阈值，在该阈值下不能测量腐蚀速率。由于不确定性，每次检查都会受到检测到小缺陷的可能性以及就缺陷的存在和大小而言错误评估的可能性的影响。目前的工作旨在将不完善的检查结果整合到腐蚀管道的成本模型中，在该模型中，通过可靠性方法计算出故障概率。在燃气管道上的数值应用表明腐蚀速率和残余应力对最佳维护计划的影响。

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