In-pipe Detection System Based on Magnetic Flux Leakage and Eddy Current Detection

Pipeline plays an important role in the transportation of oil and gas. In-pipe detection technology is currently widely used at home and abroad. It is of great significance to develop in-pipe detection equipment with independent intellectual property rights and suitable for the actual situation of oil and gas pipelines in China. ANSYS software is used to simulate and analyze the leakage magnetic field of pipeline defect, and the influence rule of defect size on the leakage magnetic field is explored. An in-pipe detection system based on magnetic flux leakage and eddy current detection is designed and implemented, which takes the magnetic flux leakage (MFL) detection and eddy current (EC) detection as the main detection means, mainly including detection sensor and data acquisition and storage system. The system is carried by in-pipe detection equipment to carry out a pull test in a specially-made pipe. The results show that the system has a good detection effect for various types of defects, and the results of the pull test further verify the simulation results. The in-pipe detection system combines the advantages of MFL and EC detection, and can meet the needs of the pipeline detection tasks in China.