A pipeline leakage detection method

Abstract

The present invention discloses a pipeline leakage detection method, which relates to the technical field of pipeline detection. The method comprises: collecting pressure pulsation signals from the pipeline under test using two sensors; performing a fast Fourier transform on the pressure pulsation signals of the pipeline under test to obtain an actual frequency domain signal; and comparing the frequency domain signal of the pipeline under test in a non-leaking condition with the actual frequency domain signal to obtain the amplitude change of the characteristic frequency to determine whether the pipeline under test is leaking. The method avoids the need for retesting with other tools, significantly improving the efficiency of pipeline leakage detection.

Claims

1. A pipeline leakage detection method, characterized in that: include: A sensor is placed at each of the upstream and downstream ends of the pipeline to be tested, and the two sensors collect the pressure pulsation signal of the pipeline to be tested; a fast Fourier transform is performed on the pressure pulsation signal of the pipeline to be tested to obtain the pressure pulsation signal frequency that represents the actual working condition of the pipeline to be tested; the characteristic frequency of the maximum amplitude of the pressure pulsation signal under the non-leakage working condition is compared with the characteristic frequency of the maximum amplitude of the pressure pulsation signal of the pipeline to be tested, and a step amplitude range is set. The size of the characteristic frequency and amplitude within the step amplitude range is determined to determine the pipeline leakage status; The pressure pulsation signal frequency specifically includes: For the pressure pulsation signal frequency (h1, h max ) within the amplitude A, each specific frequency h i The amplitude at can be expressed as: A(h i )=A i , for h i ∈{h1,h2,h3,...,h max }; Where A(h i ) represents the frequency h i The amplitude at A i is the frequency h i The specific pressure pulsation signal amplitude of the set {h1,h2,h3,...,h max } contains from h1 to h max All specific frequency points within the interval; The characteristic frequency of the maximum amplitude of the pressure pulsation signal specifically includes: The characteristic frequency of the maximum amplitude of the pressure pulsation signal of the non-leaking pipeline is h m , the characteristic frequency of the maximum amplitude of the pressure pulsation signal of the pipeline to be tested is h n ; The step range specifically includes: If h m <h n , then the interval is (2h m -h n , 2h n -h m ); If h m >h n , then the interval is (2h n -h m , 2h m -h n ); In the set step range, if the characteristic frequency h m <h n ,A(h m )< A(h n ), indicating that the pipeline is leaking.

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