Magnetic flux leakage (MFL) testing is one of common methods for nondestructive testing of gas transmission pipeline and an effective method of real time detecting of gas transmission pipeline.

It is pointed out that the research, development and popularization of electromagnetic ultrasonic testing and ultrasonic detection of leakage in steam pipelines should be carried out.

QC Group of Undamaged Detection, Sub-company of Pipeline Technology Operation, Storage and Transportation company, SINOPEC Group.