中俄东线天然气管道剩磁焊接指标研究  

Study on Pipeline Remanence Index of the China-Russia Eastern Gas Pipeline Project

作　　者：谭笑 刘少柱[2] 吴晓光[2] 柳尚 Tan Xiao;Liu Shaozhu;Wu Xiaoguang;Liu Shang(PetroChina Pipeline R&D Center,Langfang,Hebei,065000,China;PetroChina Pipeline Company,Langfang,Hebei,065000,China)

机构地区：[1]中油管道科技研究中心,河北廊坊065000 [2]中国石油管道公司,河北廊坊065000

出　　处：《天然气与石油》2020年第2期22-25,78,共5页Natural Gas and Oil

基　　金：中国石油管道公司科研课题“大口径油气管道维抢修技术及装备研发”(2017/B-3106-0506)。

摘　　要：长输管道在建设、改线或维抢修作业时,常会遇到管道对口处有磁偏吹现象,使得在焊接施工时,电弧发生偏离,导致焊接缺陷甚至无法焊接施工,严重影响工程进度及管道本质安全。分析了管道剩磁的产生机理和危害,梳理并对比了国内外对于管道焊接剩磁的指标要求,并通过试验验证了管道剩磁在中俄东线天然气管道焊接作业中的适用性。试验结果表明,对于高钢级管道磁场强度应当至少低于5 mT,才能满足焊接的要求进行施焊。试验结果对类似天然气管道焊接作业有较好的指导意义。During the construction,reroute and repairing of long-distance pipeline,magnetic blow in pipeline junction is frequently occurring.Magnetic blow,which means welding arc deviation,will lead to welding defect or even welding failure,and then,seriously affect the progress of the project and the essential security of pipeline.The pipeline remanence will lead to magnetic blow,resulting in welding defect and then seriously affect the essential security of pipeline.After the study of mechanism and hazard of residual magnetism in pipeline and the comparison of pipeline remanence index at home and abroad,a verification experiment of the China-Russia Eastern Gas Pipeline Project has been made for defining the effect of remanence on welding.The experimental results show that the welding operation can be carried out only when the magnetic field strength of the pipeline is lower than 5 mT.The test results will effectively guide the welding operation of similar gas pipeline.

关 键 词：中俄东线 焊接 剩磁 

分 类 号：TE973.3[石油与天然气工程—石油机械设备]