摘要
附加应力应变的存在降低了环焊缝对缺陷与管材力学性能差异的容许值,并可导致缺陷扩展直至失效。长输油气管道在途经山地、冻土等地质灾害多发区域时,易受外部载荷影响,导致管道本体承受较大的附加应力,亟需可靠的技术手段以排查管体应力风险,确保管道安全运行。基于全尺寸牵拉试验平台,开展了S355、S235、X65共3种不同管材管道全尺寸试验,对管材力学性能与弯曲应变状态内检测技术的综合应用进行研究。结果表明,管材力学性能内检测技术是一种基于预先磁化的电磁涡流检测新型内检测技术,可以有效检测管材的屈服强度,并据此识别不同管节所使用的管道材料。该技术可用于环焊缝与母材强度匹配性预测,为管材力学性能快速在线检测和后期的完整性评价提供了一种较为新颖的方法。此外,该技术是基于惯性导航检测单元的弯曲应变内检测技术的有力补充,可对管道本体应力应变状态开展全面检测,及时发现并有效预防因附加应力较大而发生的管道失效。(图6,表2,参22)
The presence of additional stress-strain reduces the tolerance of the girth weld for defects and mechanical properties of pipe material and may lead to the further extension of defects to failure.Long-distance oil and gas pipelines are susceptible to large additional stresses in the pipeline body due to external loadings when passing through the geologically-hazardous areas such as mountains and permafrost.Therefore,it is in urgent need of reliable technical means to investigate the stress risk of the pipeline body to ensure the safe operation of pipeline.Herein,full-scale pipeline tests of three pipe materials,i.e.,S355,S235 and X65,were conducted based on the fullscale traction test platform,so as to research the comprehensive application of inline inspection technology for the mechanical properties and stress-strain state of pipe materials.The results indicate that the inline inspection technology for mechanical properties of pipe materials is a new one based on the premagnetized electromagnetic eddy current inspection,which can inspect the yield strength of pipe materials effectively and identify the pipe material used in different pipeline sections accordingly.This technology can be used to predict the compatibility of girth welds with the strength of base metal,thus providing a new method for the rapid inline inspection of mechanical properties and the later integrity assessment of pipe materials.In addition,this technology is a useful supplement to bending strain in-line inspection technology based on the inertial navigation inspection unit,so that the stress-strain state of pipeline body can be inspected thoroughly,to timely discover and effectively prevent the pipeline failure due to large additional stress.(6 Figures,2 Tables,22 References)
作者
李睿
陈健
王长友
陈朋超
李雨佳
燕冰川
郑健峰
富宽
贾光明
LI Rui;CHEN Jian;WANG Changyou;CHEN Pengchao;LI Yujia;YAN Bingchuan;ZHENG Jianfeng;FU Kuan;JIA Guangming(PipeChina Institute of Science and Technology;PipeChina North Pipeline Company;PetroChina Natural Gas Sales Company Northern Branch;China Petroleum Pipeline Engineering Co.Ltd.)
出处
《油气储运》
CAS
北大核心
2023年第4期407-413,共7页
Oil & Gas Storage and Transportation
基金
国家管网集团公司科技重大专项“高钢级管道缺陷检测评价技术研究”,WZXGL202104。
关键词
油气管道
应力
应变
力学性能
内检测
惯性导航
oil and gas pipelines
stress
strain
mechanical properties
in-line inspection
inertial navigation
