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Cui-Wei L.,China University of Petroleum - East China | Cui-Wei L.,Key Laboratory of Qingdao Oil and Gas Storage and Transportation Technologies | Cui-Wei L.,China National Petroleum Corporation | Yu-Xing L.,China University of Petroleum - East China | And 4 more authors.
Process Safety and Environmental Protection | Year: 2015

In order to study the fundamentals of leak detection and location for natural gas pipelines based on acoustic method, the propagation model of leakage acoustic waves is established and modified. First, the wave equations of leakage acoustic waves are researched in theory and the propagation law in actual pipelines is analyzed to obtain the damping impact factors which cause the attenuation. Then, the fundamental characteristics of leakage acoustic waves are obtained through experiments by time-domain, frequency-domain and joint time-frequency-domain analyses. Third, the actual propagation model is established which can be used to calculate the installation distance of the acoustic sensors. Finally, a new leak detection and location method is proposed based on the propagation law which is validated by the field experiments and the fundamental, the steps and the merits of the method are concluded. The results indicate: the propagation model can be established and modified by the experimental method combined with theoretical method, which can direct the acoustic sensors to be installed into the pipelines; the propagation-characteristics-based leak location method is effective. Conclusions can be drawn that the modified propagation model can make acoustic leak detection method used in natural gas pipelines better. © 2015 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.


Liu C.-W.,China University of Petroleum - East China | Liu C.-W.,Key Laboratory of Qingdao Oil and Gas Storage and Transportation Technologies | Liu C.-W.,China National Petroleum Corporation | Li Y.-X.,China University of Petroleum - East China | And 9 more authors.
Journal of Loss Prevention in the Process Industries | Year: 2015

In order to study a new leak detection and location method for oil and natural gas pipelines based on acoustic waves, the propagation model is established and modified. Firstly, the propagation law in theory is obtained by analyzing the damping impact factors which cause the attenuation. Then, the dominant-energy frequency bands of leakage acoustic waves are obtained through experiments by wavelet transform analysis. Thirdly, the actual propagation model is modified by the correction factor based on the dominant-energy frequency bands. Then a new leak detection and location method is proposed based on the propagation law which is validated by the experiments for oil pipelines. Finally, the conclusions and the method are applied to the gas pipelines in experiments. The results indicate: the modified propagation model can be established by the experimental method; the new leak location method is effective and can be applied to both oil and gas pipelines and it has advantages over the traditional location method based on the velocity and the time difference. Conclusions can be drawn that the new leak detection and location method can effectively and accurately detect and locate the leakages in oil and natural gas pipelines. © 2015 Elsevier Ltd.

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