油气输送管道凹坑修复判定准则.pdfVIP

油气输送管道凹坑修复判定准则 1 2 3 宋汉成 ，樊兆存 ，赵丽恒 （1 挪威船级社（中国）有限公司，北京，100020；2 中国石化胜利油田油气集输总厂，东营， 257061；3 中国石化山东省天然气管道有限责任公司，济南，250101） 摘要：系统的分析了美国联邦法规49 CFR 195、49 CFR 192和ASME标准B31.4、 B31.8管道凹坑修复判定标准，提出了凹坑的深度修复判定准则、应变修复判定 准则以及有限元分析方法。有限元分析结果认为相同深度尺寸的尖锐凹坑比平滑 凹坑的应力水平明显高很多，消除深度小但应变大的凹坑，避免类似 Marathon Ashland管道凹坑破裂的事故。以某原油管道深度为5.97%管道直径的凹坑为例， 凹坑深度和应变修复判定准则认为需要修复，有限元模拟结果给出可以承受 3MPa 以上的内压。最后分别提出了液体管道和气体管道的凹坑修复判定准则， 将凹坑分为四个修复等级，考虑了凹坑深度、凹坑处应变水平以及管道实际运行 应力水平等因素。 关键词：油气管道，管道凹坑，修复准则，有限元模拟 Oil and Gas Pipeline Dent repair Criteria 1 2 3 Alex Song ，Fan zhaocun ，Zhao Liheng （1 Det Norske Veritas (china) Co. Ltd., Beijing, 100020；2 Sinopec Shengli Oil Field Oil and Gas Gathering Company，Dongying, 257061; 3 Sinopec Shandong Natural Gas pipeline limited company, Jinan, 250101 ） Abstract ：Pipeline dent repair criteria included in American federal regulations 49 CFR 19549 CFR 192 and ASME standards B31.4B31.8 have been analyzed systematically, propose depth based repair criteria, strain based repair criteria and FEA method. It is considered that stress in sharpened dent is higher than smooth dent with the same depth size, so eliminate shallow but sharpened dent to avoid similar pipeline rupture accident with Marathon Ashland. For a crude oil pipeline with a 5.97%OD dent, it should be repaired according depth and strain repair criteria, and the FEA result show that it can bear 3MPa internal pressure. And suggest the liquid and gas pipeline dent repair criteria respectively based on dent depth, strain and operation stress level, the repair grade divide into four classes. Keywords ：oil and gas pipeline，pipeline dent ，repair criteria ，Finite element simulation 0 引言 凹坑是由于管壁永久塑性变形而使管道横截面发生的几何变形，一般是管道 施工建设期间搬运、回填中的碰