Study on internal stress damage detection in long-distance oil and gas pipelines via weak magnetic method

Bin Liu; Luyao He; Zeyu Ma; Hai Zhang; Stefano Sfarra; Henrique Fernandes; Stefano Perilli

doi:10.1016/j.isatra.2018.12.009

Study on internal stress damage detection in long-distance oil and gas pipelines via weak magnetic method

ISA Trans. 2019 Jun:89:272-280. doi: 10.1016/j.isatra.2018.12.009. Epub 2018 Dec 13.

Authors

Bin Liu¹, Luyao He², Zeyu Ma³, Hai Zhang⁴, Stefano Sfarra⁵, Henrique Fernandes⁶, Stefano Perilli⁷

Affiliations

¹ College of Information Science and Engineering, Shenyang University of Technology, Shenyang 110870, China. Electronic address: syuotwenwu@sina.com.
² College of Information Science and Engineering, Shenyang University of Technology, Shenyang 110870, China. Electronic address: 550501733@qq.com.
³ College of Information Science and Engineering, Shenyang University of Technology, Shenyang 110870, China. Electronic address: 1018130315@qq.com.
⁴ Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, M5S 3G8, Canada; Department of Electrical and Computer Engineering, Computer Vision and Systems Laboratory, Laval University, Quebec, G1V OA6, Canada.
⁵ Department of Industrial and Information Engineering and Economics, University of L'Aquila, Piazzale E. Pontieri no. 1, 67100 Monteluco di Roio - L'Aquila (AQ), Italy; Tomsk Polytechnic University, Lenin Av., 30, Tomsk, 634050, Russia. Electronic address: stefano.sfarra@univaq.it.
⁶ School of Computer Sciences, Federal University of Uberlândia, 2121 Av. Joao Naves de Avila, Uberlândia 38400-902, Brazil. Electronic address: henrique.fernandes@ufu.br.
⁷ Department of Industrial and Information Engineering and Economics, Las.E.R. Laboratory, University of L'Aquila, Piazzale E. Pontieri no. 1, 67100 Monteluco di Roio - L'Aquila (AQ), Italy. Electronic address: Stefano.perilli@graduate.univaq.it.

PMID: 30606451
DOI: 10.1016/j.isatra.2018.12.009

Abstract

Weak magnetic stress detection is an important issue in oil-gas pipeline internal detection area. In order to verify the characteristics of weak magnetic stress internal detection signals, we built herein a magneto-mechanics equivalent model having a balanced magnetic field. First, we calculated the relationship between the stress and the weak magnetic signals; consequently, the analysis propagation laws of the weak magnetic signals with non-magnetic saturation were pointed out. Finally, the theoretical model was validated by a systematic experimental research. The analytical results show that a one-to-one linear link between the weak magnetic signals and the stress concentration is clear. Instead, the change of the weak magnetic signals with the liftoff is nonlinear, therefore we are proposing the Boltzmann liftoff correction factor whose degree of adaptability of the equivalent model can reach the value of 94%. It is possible to note that when the liftoff is in the approximate linear stage, the relevance ratio and the recognition rate of the magneto-mechanics curve show a high-quality. This conclusion is important in the engineering field for the set of the liftoff.

Keywords: Liftoff; Linear; Magneto-mechanics equivalent model; Pipe; Stress concentration.