Considering the most commonly used MFL examination,and compared with the related standards,"the wooden barrel effect" of the pipeline risk was proposed fitness-for-service assessment model to long buried pipeline corrosion flaw in the service was set up,which can calculate the flaw pi.

Aiming at the noise interference problems occurred in acoustic emission pipeline leakage detection,signal analysis method based on wavelet package and empirical mode decomposition(EMD) were researched,respectively.