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Study on Precision-Influencing Factors of Gas Pipeline Leak Detection and Location Based on Negative Pressure Wave

Author: ChenKeQin
Tutor: YangQingJun
School: Harbin Institute of Technology
Course: Mechanical and Electronic Engineering
Keywords: Pipeline Leak Detection and Location Negative pressure wave FLUENT software Positioning accuracy
CLC: TE973.6
Type: Master's thesis
Year: 2009
Downloads: 145
Quote: 1
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Abstract


Pipeline transportation system in China's national economic development plays an increasingly important role in the timely detection of pipeline leaks, accurately determine the location of the leak hole reduce economic losses , maintaining safe operation of pipelines is important. Based on negative pressure wave pipeline leak detection and location do not need to establish pipeline model , low cost , high efficiency, suitable for undergoing rapid , sudden leak of the occasion , and thus become a research hotspot in recent years . Based on the theoretical analysis, simulation and experimental study on the basis of pipeline leak hole position accuracy factors were studied . Based on negative pressure wave pipeline leak detection and location of the basic principles of pipeline leak hole positioning accuracy of the main influencing factors , derived pressure distribution along the pipeline , the temperature distribution and pipeline gas flow rate and negative pressure wave propagation velocity analytical formula , proposed an improved leak hole positioning algorithm, prepared for the leak hole positioning graphical interface. Established a pipeline gas flow numerical model , got a two-dimensional discrete transient convection-diffusion equation problem , the application of computational fluid dynamics software FLUENT isothermal and non-isothermal pipeline pipeline leakage simulation analysis to verify the pipeline gas flow rate , pressure, density , temperature and other changes along the pipeline and pipeline leak after the first end of the pressure, flow variation , the traditional location algorithm and improved positioning algorithm for positioning results were compared and analyzed . To leak hole location , leak hole diameter , the ambient temperature and the pipe wall roughness parameters, pipeline leak under different parameters of the simulation, analysis of various parameters on the pipeline leak detection and location of the situation . Build a gas pipeline leak detection and location of experimental platform, using multi- scale wavelet analysis method to extract pipeline leakage signal singularity of different locations pipeline leak experimental verification , the results show that the improved positioning algorithm is superior to the traditional positioning methods positioning results in order to verify the correctness of the improved positioning algorithm .

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CLC: > Industrial Technology > Oil and gas industry > Oil machinery and equipment and automation > Oil and gas storage and transportation machinery and equipment > Oil and gas pipelines > Pipeline inspection
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