A Method for Detection and Precise Location of Small Leakage Sources in Pressure Pipelines

Abstract

The invention discloses a detection and accurate positioning method for a small leak source of a pressure pipe. Acoustic emission leak detection technology is adopted, based on a mutual correlation positioning theory and the characteristics that a quantitative calculation result is high in objectivity and reliability of the theory, a positioning model for detecting a small leak source of a pressure pipe is established. Based on the basis that a collection signal is treated through combination of modal acoustic emission technology and wavelet transform, isolated component analysis technology is introduced, isolation analysis of a positioning signal of the small leak source is achieved through a Fast ICA tool box for fast analysis of isolated components, and a multi-point positioning calculated result with high precision is obtained. According to the method, the effect between small leak source signals is reduced, positioning data for multi-point mall leak source is separated, and positioning for a small leak source of a pressure pipe is accurate.

Description

technical field [0001] The invention relates to the field of oil and gas storage and transportation risk control, in particular to a small leak detection and precise positioning method of a pressure pipeline. Background technique [0002] With the development of industry, the use of pipeline transportation in life and production is getting larger and larger, ranging from small domestic water supply and gas supply pipeline networks to large transportation pipelines such as industrial production materials and national oil and gas pipelines. Pipelines have become the fifth largest means of transportation in addition to trains, automobiles, ships, airplanes and other equipment. Due to various reasons, such as wear, aging, corrosion, man-made damage, etc., pipelines often leak. Once an accident occurs, it will range from material loss to casualties and environmental damage. [0003] For example, on November 22, 2013, a crude oil leak and explosion occurred in Qingdao Economic an...

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Problems solved by technology

However, the actual pipeline leakage often does not have only one leakage point, and there are relatively few studies on the pipeline leakage model with two or more points, that is, there are two or more leakage points between two sensors, especially The application of acoustic emission pipeline leak detection technology to the location of two-point leaks, due to the mutual influence of the location signals of the two leak sources, will cause the signal received by the sensor to be the location data of the two signals mixed with each other, plus non-leakage environmental noise, etc. Influenced by various factors, it is difficult to locate the leak source

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