The Study of Electromagnetic Stress Testing Method on Oil-Gas Pipelines Based on WT

Bin Liu, Wanru Sun, Yiren Lin

School of Information Science and Engineering, Shenyang University of Technology, Shenyang, China.

DOI: 10.4236/gm.2014.42006                

Abstract

This paper proposes an effective method for early diagnosis (stress concentrating) of the oil-gas pipeline. Based on the principle of electromagnetic induction Faraday, we have designed and realized the nondestructive testing system for stress concentration area of ferromagnetic materials by means of the research of metal materials inverse magnetostrictive effect mechanism. The system changes the influence degree of the stress in ferromagnetic materials’ magnetic conductance to the corresponding voltage array by using discrete wavelet analysis method to process the data, in which not only the measuring accuracy is improved, but also the stress concentration is more directly reflected. The experiments confirm that the electromagnetic stress testing method is feasible and valid.

Keywords

Oil-Gas Pipeline, Electromagnetic Induction, Magnetic Conductance, Stress Concentration, Nondestructive Testing

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Wan, Z.J., Liao, J.B., Wang, Y.K. and Yin, G.F. (2011) Research on Metal Tubing Pit Corrosion Monitoring Based on Potential-Array Method. Chinese Journal of Scientific Instrument, 32, 19-25.
[2]	Pohl, R., Erhard, A., Montag, H.J., Thomas, H.M. and Wüstenberg, H. (2004) NDT Techniques for Railroad Wheel and Gauge Corner Inspection. NDT & E International, 37, 89-94. http://dx.doi.org/10.1016/j.ndteint.2003.06.001
[3]	Wen, X.Q. and Liu, C.W. (2002) Magnetic Residual Stress Testing Method Based on Magnetostrictive Effect. Sensor Technology, 21, 42-44.
[4]	Liu, J.H. and Feng, J. (2011) Research on Leak Fault Intelligent Detection Method for Fluid Pipeline Based on Fuzzy Classification. Chinese Journal of Scientific Instrument, 32, 26-32.
[5]	Xu, J.L. and Hua, B., et al. (2009)The Research Status and Progress of the Technology of Magnetic Memory Testing. Journal of Inspection and Quarantine, 19, 64-66.
[6]	Jia, W.L. and Liao, K.X., et al. (2010) Acidic Gas Pipeline Corrosion Defects Detection Technology. Oil and Gas Field Surface Engineering, 29, 1-2.
[7]	Huang, S.L., et al. (2011) Oil and Gas Pipeline Deformation Finite Element Analysis of Eddy Current Probe Coil. Journal of Tsinghua University, 51, 390-394.
[8]	Yang, L.J., et al. (2002) Wavelet Analysis of MFL Signals in the Pipeline. Journal of Instruments and Meters, 23, 484-488.
[9]	Tang, Y., et al. (2009) Analysis of Characteristics of Pulsed Magnetic Flux Leakage Testing of 3D and Defect Classification. Journal of Instruments and Meters, 30, 2506-2510.
[10]	Yang, L.J., et al. (2004) Pipeline Magnetic Flux Leakage On-Line Detection System Research. Journal of Instruments and Meters, 27, 48-50.
[11]	Cheng, S. and Yang, R.X., et al. (2008) Application of Wavelet Analysis in Nondestructive Testing of Metal Magnetic Memory. Automatic Measurement and Control, 27, 48-50.