Method and system for detecting internal leakage of buried earth valve based on valve cavity pressure

Abstract

The invention provides a method and system for detecting inner leakage of a buried earth valve based on valve cavity pressure, and belongs to the technical field of valve inner leakage detection. According to the method, the internal leakage amount of the buried ball valve is obtained firstly, then inversion of the internal leakage rate of the ball valve is achieved through the BP neural network, and therefore the internal leakage amount of the buried ball valve is obtained through detection. The system can comprise a signal acquisition and denoising unit, a feature extraction unit, an internal leakage inversion unit and a judgment output unit. According to the method, qualitative judgment on the inner leakage of the buried earth valve can be realized; the leakage rate can be inversed through the neural network to solve the specific numerical value of the leakage rate; the inner leakage degree of the valve can be graded and judged according to the specific numerical value of the inner leakage amount of the valve and in combination with related standard requirements of a project; and assistance can be provided for on-site treatment of internal leakage, valve damage is reduced, and the maintenance cost of the valve is saved.

Description

technical field [0001] The invention relates to the technical field of internal leakage detection of buried globe valves, in particular to a method for judging internal leakage of buried globe valves based on valve cavity pressure, and a method for obtaining the leakage amount of buried globe valves based on valve cavity pressure , a method for detecting internal leakage of a buried globe valve based on valve cavity pressure, and an internal leakage detection system for realizing the aforementioned method for detecting internal leakage of a buried globe valve. Background technique [0002] Valve is a general-purpose mechanical product widely used in petroleum, natural gas, chemical, electrical and other industries. It is an indispensable fluid control equipment in these industrial device systems and plays an important role in the entire industrial system. The industry with the largest demand for valves in the world is the oil and gas industry, which accounted for 37.4% of th...

AI Technical Summary

Problems solved by technology

Although both belong to non-destructive testing and have high safety, they can detect the leakage of most of the valves on the ground, but they cannot detect the internal leakage of buried valves.

The detection cycle is an inspection before the annual winter maintenance. There is no scientific and reliable basis for the degree of internal leakage. It can only be judged based on the experience of the staff. This type of detection method has low accuracy, time-consuming, and low safety factor. question

Moreover, minor internal leakage cannot be detected on site at all. Only when the internal leakage is serious, will it be discovered and certain remedial measures will be taken, usually adjusting the limit and injecting grease. It is difficult to carry out valve maintenance and other work, and due to production Requirements and equipment management and other reasons, the internal leakage ball valve cannot be replaced in time

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