腐蚀管道剩余强度评价方法及寿命预测研究..doc

腐蚀管道剩余强度评价方法及寿命预测研究 陈兆雄1，吴明1，谢飞1，王丹1，郭强2，马菲3 (1.辽宁石油化工大学石油天然气工程学院，辽宁 抚顺 113001；2.辽宁石油化工大学信息与控制工程学院，辽宁 抚顺 113001；3.中国石油青海油田公司格尔木炼油厂，青海 格尔木 816000) 摘要：介绍了非线性有限元、可靠度分析和剩余强度评价公式，分析其特点及适用性。分析不同管道强度，四种剩余强度评价准则对预测结果的影响。结果表明：对于不同钢级管道，API 579准则预测的失效压力最为保守，其次为B31G准则，而PCORRC方法计算结果相对较大。针对辽河油田集输管道某腐蚀缺陷，以B31G剩余强度评价准则为例，结合实验室得到的均匀腐蚀速率对其进行剩余寿命预测。为提高预测精度，采用非线性有限元和可靠度分析法进一步预测剩余寿命。采用经验公式、有限元法和可靠度分析得到的剩余寿命结果分别为10.8、12和13.6年。 关键词：腐蚀；剩余强度；有限元；集输管道；可靠性分析； 中图分类号：TB304 文献标识码：A Residual Strength Evaluation Methodology and Residual Life Prediction Method of the Corroded pipeline CHEN Zhao-xiong1，WU Ming (1.School of Petroleum and Natural Gas Engineering，Liaoning Shihua University，Fushun 113001，ChinaInformation and Control Engineering，Liaoning Shihua UniversityFushun 113001，ChinaGolmud Refinery Plant of Qinghai Oilfield of CNPC，Qinghai 816000，China) Abstract: This article introduces the nonlinear finite element method, reliability analysis and residual strength assessment formulas. And it analyzes their characteristics and applicability. It analyzes those elements, which are different pipeline strength and four kinds of residual strength assessment formula. Take the residual strength assessment formula of B31G, for example, it predicts the residual longevity with uniform corrosion rate measured in laboratory for the gathering pipeline in Liao he oilfield. Taking the nonlinear finite element method and reliability analysis further predicted the residual service life in order to improve prediction accuracy. Conclusion: For different strength pipeline, the failure pressure calculate by API 579 is the smallest among other three formulas, and the second is B31G, but the largest one is PRORRC. The residual life is 10.8years, 12years and 13.4years respectively. Key words: corrosion; residual strength; the finite element method; gathering pipeline; reliability analysis; 0 引言 收稿日期: 修回日期: 基金项目：国家自然科学基金(1987-)，男，辽宁大连人，硕士研究生，从事管线钢腐蚀与防护研究 导师：吴明 自20世纪