Long-distance Pipeline Defect Repair Practice

With the running time of growth,domestic long-distance pipeline the occurrence of a number of spiral weld cracking has characteristics of the old pipeline leakage accident.The three axial MFL internal inspection,"physical examination" of the pipeline,the pipe body defects can be found in time,including the external corrosion,corrosion,spiral weld defects,weld defects,defects such as depression,highlighted the importance of the pipe body defect repair work.The ultimate objective of pipeline integrity management is to ensure the safety of the pipeline,but it is different from the traditional pipeline safety management,safety management of early after the accident,the accident of repair,is the passive coping,and pipeline integrity management is the change from passive to active,before the accident is to detect and evaluate the pipeline making maintenance plan,repair,repair plan,and this process is a cycle of continuous improvement,to ensure that the pipeline in the long-term of accident free state.Pipeline internal inspection and defect repair is the key step of pipeline integrity management,according to the various defect types need to repair the repair standards at home and abroad,presents several tube body defect repair,the repair process,according to the comprehensive analysis of the defect type,size,site conditions,the optimal selection of repair.This paper discusses the various defect repair method,according to nearly 1000 tube defect repair practice,discusses the way to deal with different defects,and combining the experience gives defect repair process.Aiming at all kinds of defects and different site conditions,coping methods are not the same,every line,every kind of defects,need to combine the actual situation,targeted to develop repair programme.Timely on pipeline defect repair is an important means to ensure the safe operation of pipeline.