腐蚀坑形貌对油气管道失效压力的影响  

Corrosion pit morphology on the impact of oil and gas pipeline failure pressure

作　　者：崔铭伟[1] 曹学文[1] 封子艳 

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,山东青岛266580 [2]延长石油集团研究院,西安710075

出　　处：《船舶力学》2014年第1期124-131,共8页Journal of Ship Mechanics

基　　金：国家自然科学基金项目(No.51006123)

摘　　要：ASME B 31G规范把复杂的腐蚀坑剖面曲线简化成矩形或抛物线投影,是造成ASME B 31G规范预测结果出现保守和不稳定性的重要原因。文章采用非线性有限元方法,综合分析了腐蚀坑剖面面积和腐蚀坑形状系数对腐蚀管道失效压力的影响,提出一种新的以腐蚀坑剖面面积和腐蚀坑形状系数描述腐蚀坑形貌的B31G修正公式,实际算例表明新提出的B31G修正公式的预测结果保守性低,预测误差稳定。The failure pressure of oil and gas pipeline with different morphology of corrosion pits was anal- ysed by using the nonlinear finite element method. The impact of the cross-section area of corrosion pit on pipeline failure pressure with the axial and circumferential corrosion was researched. The analysis showed that the cross-sect/on area of corrosion pits seriously influenced the failure pressure of pipeline with axial corrosion, however, which was not enough to fully describe the effects of the morphology of corrosion pits on pipeline failure pressure. The research considered the effects of the morphology of corrosion pits by using the cross-section area of corrosion pit and form factor of corrosion pit to descripe on pipeline failure pressure, and proposed a new B31G correction formula. The results show that forecast error and the fluctu- ation range of the error are little using the formula.

关 键 词：油气管道 腐蚀坑形貌 腐蚀坑剖面面积 腐蚀坑形状系数 有限元法 

分 类 号：TE88[石油与天然气工程—油气储运工程]