Abstract: It is of great significance to predict the long distance oil pipeline residual life for avoiding leakage accidents and saving repair costs. For the two corrosiondefect points that were dug out on one domestic refined oil pipeline, the threedimensional finite element model of ellipsoidal defect of pipelines structure based on FEA was established. According to the measured dimensions of the two defects of pipeline, the stress analysis of corroded pipelines using nonlinear analysis technique and the remaining life prediction based on plastic limit state failure criterion was also done. The results show that the remaining life of the two corrosion defects were respetively 8 and 13 years. The predicted results could provide theoretical basis for pipeline maintenance and repair.

Key words: External corrosion pipeline, Residual life, Finite element, Nonlinear, 3D model, Corrosion rate

摘要： 预测油气管道的剩余寿命, 对避免管道泄漏事故的发生和节省维修费用具有重要意义。针对国内某成品油管道开挖点处的两个腐蚀缺陷, 基于有限元分析方法, 建立了管道椭球形缺陷的三维有限元结构模型。以管道实测缺陷尺寸为依据, 在已知腐蚀速率的情况下, 采用非线性分析技术对腐蚀管道进行了应力分析, 依据塑性极
限状态失效准则预测了管道的剩余寿命。结果表明, 两个腐蚀缺陷的剩余寿命分别为8a和1 3a, 预测结果可为管道的维护维修提供理论依据。

关键词: 外腐蚀管道, 剩余寿命, 有限元, 非线性, 三维模型, 腐蚀速率