Underground pipeline leak-detection method and apparatus

Abstract

This invention provides a leakage test method and a device including: marking a basic tendency of an underground line to be tested, injecting a tracer gas in a certain pressure composition of 5% hydrogen and 95% nitrogen to the line, testing the H2 signal along the tendency of the pipeline with a H2-sensitive probe of a movable hydrogen leak detector, converting the test signal to an electric signal then converting it to a digital signal by A / D conversion, memorizing and analyzing the continuously tested digital signals to judge the leakage orientation based on the change trend weak or strong of the test signal and judging the accurate position of the leak point by comparing with the maximum value of the memory and an indicator displays the maximum value of the concentration of the tested hydrogen and indicates the location of the direction and leakage definitely. Advantage: direct indication, accurate location to reduce work intensity of test.

Description

technical field

[0001] The invention belongs to the field of pipeline leakage detection, and in particular relates to a method and a device for detecting underground pipeline leakage by using a hydrogen tracing method. Background technique

[0002] In order to meet the production needs of urban and rural life and industrial fields, people have laid a large number of pipeline projects underground, and use these pipelines to transport water, oil, steam, gas (such as liquefied petroleum gas, natural gas) industrial products, etc. These pipelines are usually pressure pipelines. Before the newly laid pressure pipelines are put into use, pipeline leak detection is usually required to confirm that there is no leakage to ensure safe operation. In more cases, after the underground pipeline is put into use, it often causes leakage due to natural or man-made reasons such as pipeline corrosion and engineering construction, which affects people's daily life and normal production of enter...

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