Feature analysis on magnetic flux leakage detection signal for special parts of oil and gas pipeline
YANG Li-jian
GUO Tian-hao
GAO Song-wei
LIU Bin
Abstract：Aiming at the structural characteristics of special parts of oil and gas pipeline,the characteristics of magnetic field generated after the magnetization of pipeline were analyzed.Based on the pipeline magnetic flux leakage inner inspection principle and Maxwell equation,the Comsol finite element simulation software was used to perform the simulation for the special parts and defects of pipeline.In addition,the channel number occupied by the axial component Bx of magnetic flux leakage signal,the appearing sequence of positive and negative peak Bx values,the Bx amplitude and axial length were taken as the basis for analyzing and distinguishing the special parts and defects of pipeline.The feature analysis on the Bx component of total magnetic flux leakage signal under the condition of existing the defects in the special parts of pipeline was carried out.When the defect signal was in the inner side of reinforcing plate signal and the polarity was opposite,the defect signal was regarded as a reinforcing plate defect.The results show that the proposed method has certain feasibility in the defect identification of special parts of pipelines.
Keywords：permanent magnetpipeline inner inspectionaxial componentspecial partsignal feature analysisMaxwell equationfinite element simulationmagnetic flux leakage
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 43-47 )