Gas pipeline leakage point positioning method and system

Abstract

The invention discloses a gas pipeline leakage point positioning method and system, and solves the problems of poor detection reliability, low detection speed and high cost of an existing method and system. The method comprises the following steps of acquiring interference signals, and determining an interference frequency band; acquiring first and second noise signals, setting a plurality of filters to cover the frequency bands of the first and second noise signals, filtering out the interference frequency band, calculating a cross-correlation coefficient of two columns of noise signals for each filter, and finding the maximum cross-correlation coefficient value and a corresponding signal-to-noise ratio of each filter; multiplying the maximum cross-correlation coefficient value and the corresponding signal-to-noise ratio of each filter to find the maximum value, and determining the corresponding filter as a final filter; and performing cross-correlation calculation on the two columnsof noise signals by using the final filter to obtain a final cross-correlation coefficient, calculating a final signal-to-noise ratio, and judging the leakage condition and the leakage point positionbetween first and second noise signal acquisition points. The system uses the method. The method and the system are easy to realize and popularize in engineering.

Description

technical field [0001] The invention relates to the technical field of gas pipeline detection, in particular to a method and system for locating a gas pipeline leakage point. Background technique [0002] Accidents such as explosions caused by gas pipeline leakage occur from time to time, seriously endangering public safety, and the safety of gas pipeline networks is particularly important. Gas pipeline leak detection and leak point location are important tasks in the daily operation and maintenance of pipelines. There are various leak detection methods currently used, each with advantages and disadvantages. Although the ground gas detection method has intuitive and accurate results, the detection success rate is low and the detection speed is slow; the tracer gas detection effect is slightly better, but the gas injection is difficult, and the gas heat The value has a great influence, and the ground needs to open holes when detecting; the anti-corrosion layer damage detecti...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a gas pipeline leakage point location method and system, which solves the problems of poor detection reliability, slow detection speed and high cost of existing methods and systems

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