Research on pipeline multi-point leakage location based on the time difference location method

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (24) : 210-217.

HAN Wenxiang,ZHANG Lanzhu

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Abstract

Pipeline transportation is one of the five modes of transportation. Due to the corrosion, the environmental impacts, man-made damages, and other factors that will lead to pipeline leakage phenomenon in the process of pipeline transportation. Pipeline leakage causes property damage and is also harmful to the environment. At present, many studies in China are focused on single-point leakage. However, in the real pipeline operating conditions, multi-points leakages are often occurring.This paper presents a method of multi-point leakage locations, which is based on the time difference location method. Taking two-point leakages as an example, two sensors were placed at both ends of the pipeline respectively. The acquired signals were separated into multiple modes by using the cross-spectrum combined with a variational mode decomposition algorithm to reduce the noise interference during the pipeline operation. A mode selection method combining the correlation coefficient after cross-spectrum filtering and information entropy and other multiple indicators was proposed. An independent signal source is separated from the denoised signal through FastICA, and then acoustic emission signals caused by the corresponding leakage source are matched based on the correlation coefficient. Finally, the location of the leakage source is obtained through the time difference location. The multi-point leakage location experiments were carried out in the laboratory by using pipelines and required equipment. Results of this study support the theoretical ideas and provide potential solutions for multi-point leakage in industrial practice.

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HAN Wenxiang,ZHANG Lanzhu. Research on pipeline multi-point leakage location based on the time difference location method[J]. Journal of Vibration and Shock, 2022, 41(24): 210-217

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