Numerical Simulation of Oil and Gas Pipeline Crack Detection Based on Pulsed Eddy Current Testing Technology

The application of pulse eddy current detection (PECT) to quantitative detection of oil and gas pipeline cracks is a hot research field in the field of nondestructive testing. Firstly, the paper analyzes the crack detection technology by pulse eddy current, and establishes the PECT finite element model with defects by Maxwell simulation software. The influence of lift height on the detection signal and the quantitative evolution law of flux density distribution with crack width and depth under certain lift height are analyzed. The simulation results show that with the increase of lift height, the flux density Z component shows a negative correlation trend; the lift off height is a certain value, and the output signal is negative with the change of crack width and depth, and the minimum crack width recognized by the detector is 0.3mm and the depth is 0.9mm. The conclusion of the study is of great significance to quantitative analysis and cost reduction of crack detection in oil and gas pipelines.