Study On The Technology Of Pipeline Leak Detection

The paper introduces the current development conditions of pipeline transportation firstly, and analyzes the problem existing in pipeline transportation. And compares some pipeline leak detection technologies in our country and others. Indicates the current condition and prospect of the technology.The paper studies the changes of pressure and flow parameters, analyzes the changes' laws of the corresponding parameters. Basing on the laws, the paper applies the pressure-flow distinguishing method into the pipeline leak detection, and through using the method of detecting the time of pressure fall.Analysis is done on the change rules of liquid' s temperature along with the pipeline' s distance .The paper points out the defects of the const pressure wave velocity method and do some improvements on it: rebuilding the expressions of the pressure wave velocity in accordance with the Simpson's rule. Combining with the time difference value of the pressure wave getting to both ends of the pipeline, adopts the Genetic Arithmeticto search the leak site of the pipeline.The relation between wavelet transform and signal singularity and the method of testing signal singularity employing wavelet transform are discussed in the paper, and gets different wavelet transform trends of signals with different characters. The paper makes use of multi-scale wavelet transform to detect the arriving time of the pressure wave to the both ends of the pipeline. The method could detect the break point of the signal, and could decrease the error bringing by the existing of impulse yawp.Contaposing to the other factors that could influence the leak testing and location, the paper studies , the paper adopts the median filtering technology, and design the projects of data transmitting via PSTN and using GPS to get the benchmark time.Finally, the paper designs a set of project to test the pipeline' s leak efficiently, and designs the hardware and software scheme.