Summary of two pipeline electromagnetic nondestructive testing methods

LIU Yu, ZHANG Si-quan, YIN Chang, Qi Chuan

(College of Logistics Engineering, Shanghai Maritime University, Shanghai 201306, China)

Abstract: In order to deal with pipeline corrosion or mechanical damage, indepth studies on eddy current testing (ECT) and magnetic flux leakage testing (MFLT) were already carried out on these two electromagnetic nondestructive testing. With the summary of their respective principles, system architectures, their technical characteristics, application scopes and some practical rules, the domestic and overseas research progress in this area and their application examples were cited. The results indicate that, compared with other testing methods, ECT has great advantage in the detection of surface, near-surface and the weld metal of the pipe such as high speed, high accuracy.Pipeline defections with coating layers can be detected as well; while MFLT is more obvious in horizontal and vertical crack detection, especially for its large application in the detection of high speed pipelines.