Measurement Method and Application of Pipeline Polarization Potential Under Subway Disturbance

doi:10.11885/j.issn.1674-5086.2021.01.04.01

Abstract

Abstract: The cathodic protection potential of the pipeline fluctuates frequently under the interference of subway. It is impossible to obtain the real protection potential of the pipeline through the traditional cut-off method. Considering that all external currents need to be disconnected, a new method is proposed to measure the polarization potential of the pipeline under the interference. Through field test and research, the main factors affecting the accurate measurement of pipeline polarization potential and their influencing rules are determined, and the parameter setting method of effective measurement of pipeline polarization potential under subway interference is established:the time when the polarization of the test piece reaches stability is at least 2.25 h, the embedding depth of coupon should not be less than 0.30 m. The recommended horizontal distance between the reference electrode and the coupon should be between 0.05 and 0.10 m.

Key words: oil & gas pipeline, dynamic DC stray current, polarization potential, polarization time, reference interval

CLC Number:

TE88

AN Jianchuan, ZHANG Wenyan, YU Zhongren. Measurement Method and Application of Pipeline Polarization Potential Under Subway Disturbance[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(4): 174-182.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2021.01.04.01

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2022/V44/I4/174

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