A Method Using Magnetic Eddy Current Testing for Distinguishing ID and OD Defects of Pipelines under Saturation Magnetization

Authors

  • Yue Long State Key Laboratory of Power Systems, Dept. of Electrical Engineering Tsinghua University, Beijing, China
  • Songling Huang State Key Laboratory of Power Systems, Dept. of Electrical Engineering Tsinghua University, Beijing, China
  • Yang Zheng Key Laboratory of Nondestructive Testing and Evaluation of AQSIQ China Special Equipment Inspection and Research Institute, Beijing, China
  • Shen Wang State Key Laboratory of Power Systems, Dept. of Electrical Engineering Tsinghua University, Beijing, China
  • Wei Zhao State Key Laboratory of Power Systems, Dept. of Electrical Engineering Tsinghua University, Beijing, China

Keywords:

Impedance measurement, inside and outside defects, magnetic eddy current testing, the defect impedance angle

Abstract

Distinguishing the inside (ID) and outside (OD) defect is an essential problem for the oil and gas pipeline nondestructive testing in engineering. The most widely used solution is to combine a magnetic flux leakage (MFL) section and a second section. For the strong magnetic field environment of the MFL, the second section and the MFL section are usually located at different mechanical positions, which leads to an increase in the length of the pipeline inspection gauge (PIG) and a decrease in the reliability. In this paper, a new impedance measurement method and the concept of the defect impedance angle are proposed to distinguish the ID and OD defects of pipelines under saturation magnetization, which based on the magnetic eddy current testing (MECT). The proposed ID & OD detection method can work with the MFL in the same mechanical position. Meanwhile, the proposed method also has the advantage that the discrimination criteria of the ID and OD defect keeps consistent with the classic eddy current testing (ECT). Furthermore, the robustness and sensitivity of the proposed method are discussed and verified by physical experiments.

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Author Biographies

Yue Long, State Key Laboratory of Power Systems, Dept. of Electrical Engineering Tsinghua University, Beijing, China

Yue Long received the B.S. degree from School of Automation Science and Electrical Engineering, Beihang University, Beijing, China, in 2017. He is currently pursuing a Ph.D. degree within the Department of Electrical Engineering, Tsinghua University. His major research interests include electromagnetic measurement and nondestructive evaluation.

Songling Huang, State Key Laboratory of Power Systems, Dept. of Electrical Engineering Tsinghua University, Beijing, China

Songling Huang received the bachelor’s degree in Automatic Control Engineering from Southeast University, Nanjing, China, in 1991, and the Ph.D. degree in Nuclear Application Technology from Tsinghua University, Beijing, China, in 2001. He is currently a Professor within the Department of Electrical Engineering, Tsinghua University. His research interests include nondestructive evaluation and instrument techniques.

Yang Zheng, Key Laboratory of Nondestructive Testing and Evaluation of AQSIQ China Special Equipment Inspection and Research Institute, Beijing, China

Yang Zheng received his B.Sc. degree in Mechanical Engineering and Automation from BeiHang University in 2007 and Ph.D. degree in Mechanical Engineering from Beijing University of Technology in 2012. Now He works as a Research Fellow in China Special Equipment Inspection and Research Institute. He works on the non-destructive testing and evaluation techniques, mainly including inspection methods study, instruments development and standards development. His current research interests include electromagnetic acoustic transducers and material magnetic testing methods.

Shen Wang, State Key Laboratory of Power Systems, Dept. of Electrical Engineering Tsinghua University, Beijing, China

Shen Wang received the bachelor’s and Ph.D. degrees in Electrical Engineering from Tsinghua University, Beijing, China, in 2002 and 2008, respectively. He is currently an Associate Professor within the Department of Electrical Engineering, Tsinghua University. His research interests include nondestructive testing and evaluation, and virtual instrumentation.

Wei Zhao, State Key Laboratory of Power Systems, Dept. of Electrical Engineering Tsinghua University, Beijing, China

Wei Zhao received the bachelor’s degree in Electrical Engineering from Tsinghua University, Beijing, China, in 1982, and the Ph.D. degree from the Moscow Power Engineering Institute Technical University, Moscow, Russia, in 1991. He is currently a Professor within the Department of Electrical Engineering, Tsinghua University. His research interests include modern electromagnetic measurement and instrument techniques.

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Published

2020-09-01

How to Cite

[1]
Yue Long, Songling Huang, Yang Zheng, Shen Wang, and Wei Zhao, “A Method Using Magnetic Eddy Current Testing for Distinguishing ID and OD Defects of Pipelines under Saturation Magnetization”, ACES Journal, vol. 35, no. 9, pp. 1089–1098, Sep. 2020.

Issue

2020: Vol 35 Iss 9

Section

Articles