管道环焊缝拉伸应变容量模型分析及改进  

Analysis and Improvement of Tensile Strain Capacity Model for Pipeline Girth Weld

作　　者：王昊[1] 张浩楠 吴圣思 吴江桥 张振永[3] 刘啸奔 张宏[1] Wang Hao;Zhang Haonan;Wu Shengsi;Wu Jiangqiao;Zhang Zhenyong;Liu Xiaoben;Zhang Hong(National Engineering Laboratory for Pipeline Safety/MOE Key Laboratory of Petroleum Engineering/Beijing Key Laboratory of Urban Oil and Gas Distribution Technology,China University of Petroleum(Beijing);National Engineering Research Center for Pipeline Safety,China petroleum Pipeline Research Institute Co.,Ltd.;China Petroleum Pipeline Engineering Corporation)

机构地区：[1]中国石油大学(北京)油气管道输送安全国家工程实验室/石油工程教育部重点实验室/城市油气输配技术北京市重点实验室 [2]中国石油天然气管道科学研究院有限公司油气管道输送安全国家工程研究中心 [3]中国石油天然气管道工程有限公司

出　　处：《石油机械》2024年第3期108-116,共9页China Petroleum Machinery

基　　金：国家重点研发计划“中俄管道重大风险防控与安全保障关键技术”(2022YFC3070100);国家自然科学基金项目“逆断层作用下X80管道屈曲演化与韧性破损机理研究”(52004314);北京市科协“青年人才托举工程”项目(BYESS2023261);国家管网科学研究与技术开发项目“高钢级管道环焊缝失效机理研究”(WZXGL202105);国家管网科学研究与技术开发项目“高钢级管道环焊缝缺陷检测评价技术研究”(WZXGL202104);中国石油大学(北京)青年拔尖人才基金项目“掺氢管道环焊缝失效机理与评价方法研究”(2462023BJRC005)。

摘　　要：为了确保石油天然气管线在复杂服役环境下的本质安全,探讨了目前国内外广泛应用的3种管道环焊缝拉伸应变容量模型(CSA Z662、PRCI-CRES、EXXON MOBIL),并对其参数选取范围性进行了汇总和对比分析。通过分析模型预测值和96组全尺寸管道及宽板拉伸试验数据的差异,对各拉伸应变容量模型在不同钢级下的预测精度进行了验证,并使用90%置信上限倒数法计算了模型安全系数。结果表明:由于CSA Z662模型断裂韧性取值上限过小,导致其对于中、高钢级管线的预测值过于保守;EXXON MOBIL和PRCI-CRES模型更为完善,二者预测结果相似,并与试验结果较为相符。针对EXXON MOBIL和PRCI-CRES模型计算所得的安全系数可以明显改善模型预测结果,可将非保守预测值最大误差控制在约30%范围内,从而有效满足较为保守的设计要求。研究结果可为管线基于应变设计提供理论指导。In order to ensure the intrinsic safety of oil and gas pipelines in complex service environments,three pipeline kinds of girth weld tensile strain capacity models(CSA Z662,PRCI-CRES,EXXON MOBIL)were discussed,and their parameter ranges were summarized and compared.By means of analyzing the differences be-tween the predicted values of the models and 96 sets of full-scale pipeline and wide plate tensile test data,the pre-diction accuracy of the tensile strain capacity models at different steel grades was verified,and the 90%confidence upper limit reciprocal method was used to calculate the safety factors of the models.The results show that due to too small upper limit of fracture toughness value in CSA Z662 model,the predicted values for medium and high steel grade pipelines are too conservative.The EXXON MOBIL and PRCI-CRES models are more perfect,and their predicted results are similar and in good agreement with test results.The safety factor calculated for the EXX-ON MOBIL and PRCI-CRES models significantly improves the model prediction results,and can control the maxi-mum error of nonconservative predicted values within a range about 30%,thus effectively meeting the relatively con-servative design requirements.The study results provide theoretical guidance for strain-based design of pipelines.

关 键 词：环焊缝 拉伸应变容量模型 本质安全 全尺寸试验 宽板试验 断裂韧性 

分 类 号：TE88[石油与天然气工程—油气储运工程]