Research on leakage magnetic field signals of tank wall defects

doi:10.16265/j.cnki.issn1003-3033.2019.05.012

Abstract

Abstract: In order to detect the corrosion defects of tank wall and ensure the safe operation of tank, magnetic flux leakage testing technology for corrosion defects of tank wall was studied in this paper. Based on the principle of magnetic flux leakage detection, ANSYS was used to simulate and analyze the magnetic flux leakage signals of tank wall corrosion defects with different shapes (cylindrical, conical, hemispherical) at different positions (inner wall, outer wall) under the circumferential and axial excitation modes outside the wall, and the defect detection research was carried out under laboratory conditions to verify the simulation results. The results show that the experimental results are the same as the simulation analysis, that there are no significant differences in the leakage field signals generated by the two magnetization modes of the circumferential magnetization and the axial magnetization, that all defects can be detected, that the magnetic leakage signal of the outer wall defect is stronger than that of the inner wall defect, and that when the defect diameter and depth are the same, the larger the volume is, the stronger the magnetic leakage signal will be.

Key words: tank wall, magnetic flux leakage testing, corrosion defects, finite element analysis, leakage magnetic field signals

CLC Number:

X944.4

YANG Zhijun, ZHANG Zhenlong, WU Zhongyi, LIU Yuzhuo, YU Yongliang. Research on leakage magnetic field signals of tank wall defects[J]. China Safety Science Journal, 2019, 29(5): 67-72.

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