Long-distance double-layer pipe inner pipe leakage point positioning method

Abstract

The invention belongs to the technical field of long-distance pipeline leakage detection, and particularly relates to a long-distance double-layer pipe inner pipe leakage point positioning method. Themethod comprises the steps that equipment used for positioning long-distance double-layer pipe inner pipe leakage points is arranged and installed; whether the inner pipe leaks or not is preliminarily checked, and the number of leakage points is determined; an upstream reference leakage point and a downstream reference leakage point are set, and the distance between the upstream reference leakagepoint and a suction gun, the distance between the downstream reference leakage point and the suction gun and the diameter of the inner pipe are determined; a to-be-detected leakage point on the innerpipe is identified; and the distance between the to-be-detected point and the suction gun is calculated, and the position of the to-be-detected point is determined. According to the method, monitoring operation is carried out at the inlet end and the outlet end of the long-distance pipeline, the number and detailed positions of the leakage points of the buried double-wall pipeline inner pipe canbe determined, and it is guaranteed that the multiple leakage points of the double-wall pipeline inner pipe can be safely, conveniently and accurately positioned.

Description

technical field [0001] The invention belongs to the technical field of long-distance pipeline leakage detection, and in particular relates to a method for locating leakage points in long-distance double-layer pipelines. Background technique [0002] Most of the hydrogen transportation pipelines of power plant generators are long-distance double-wall pipelines. The hydrogen transportation pipeline of a power plant is buried at a depth of two meters underground for more than 1,000 meters. When the inner pipe leaks, the presence of hydrogen will be detected in the interlayer. The pipe section is not accessible, which makes it difficult to locate the leak point. Currently, the existing bubble method and helium detection technology are difficult to locate the leak point of the inner pipe. Since hydrogen is a dangerous combustible gas with low ignition energy, wide explosion limit and fast burning rate, if the defects cannot be located and eliminated in time, hydrogen will accumul...

AI Technical Summary

Problems solved by technology

However, due to the flammable and explosive properties of hydrogen, neither power nor heating operation is suitable for hydrogen pipeline leak location

Images