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Influence of grade on the reliability of corroding pipelines

机译：等级对腐蚀管道可靠性的影响

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This paper focuses on a comparative analysis of the reliability associated with the evolution of corrosion between normal and high-strength pipe material. The use of high strength steel grades such as XI00 and XI20 for high pressure gas pipeline in the arctic is currently being considered. To achieve this objective, a time-dependent reliability analysis using variable Y/T ratios in a multiaxial finite strain analysis of thin-walled pipeline is performed. This analysis allows for the consideration of longitudinal grooves and the presence of companion axial tension and bending loads. Limit states models are developed based on suitable strain hardening models for the ultimate behavior of corroded medium and high strength pipeline material. In an application, the evolution of corrosion is modeled in pipelines of different grades that have been subjected to an internal corrosion inspection after a specified time which allows for a Bayesian updating of long-term corrosion estimates and, hence, the derivation of annual probabilities of failure as a function of time. The effect of grade and Y/T is clearly demonstrated.
机译：本文着重比较普通和高强度管道材料之间与腐蚀发展有关的可靠性。目前正在考虑在北极的高压气体管道中使用诸如XI00和XI20等高强度钢。为了实现该目标，在薄壁管道的多轴有限应变分析中使用可变的Y / T比进行了随时间变化的可靠性分析。该分析考虑了纵向凹槽以及伴随的轴向张力和弯曲载荷的存在。极限状态模型是基于合适的应变硬化模型开发的，用于腐蚀中型和高强度管道材料的最终性能。在一个应用中，腐蚀的过程以不同等级的管道为模型，这些管道在指定的时间后进行了内部腐蚀检查，这允许对长期腐蚀估计值进行贝叶斯更新，从而得出年腐蚀概率。失败是时间的函数。等级和Y / T的影响已得到清楚证明。

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