关键词: 油管, 无损检测, 探伤, 缺陷, 漏磁

Abstract: Total length of linked production pipes are about 1500-7000m,side wall pressure is over 20MPa.There are many kinds of polluter such as dirt and sand and flaws on the wall,that is serious danger.Ultrasonic and eddying detector are not appropriate to detect flaw,and high pressure whater detector can only detect a little flaws such as hole but the speed is low,the operation is complex.When a steady and strong enough magneic flux pass along the pipe wall,flaw in wall can change the flux passing through the wall and form leaking magnetic field.According to the principle,the high speed flaw detector of extact oil pipe is desighed and produced.It can detect flaws that in or on pipe wall such as craze,hole,hollow,groove and changed wall thickness.Detecting speed is 15-50m/min,ability D1.0 hole,diameter of tube between 50-150mm.The operation is simple,detection is steady and reliable.

Key words: production pipe, non-destructive testing, detect, flaw, magnetic leakage