Method for locating buried gas pipeline leakage point based on tracer gas

Abstract

The invention provides a method for locating a buried gas pipeline leakage point based on tracer gas. The method comprises the steps that whether leakage exists in a gas pipeline or not is detected, and if the leakage exists in the gas pipeline, the following operations are carried out, that is, the location of the leakage pipeline is determined, holes are drilled in the determined leakage pipeline in the direction of gas flow, probe holes are labeled and counted, and the background concentration of H2 or He in the pipeline is measured; for a closed static gas pipeline, the following operations are carried out, that is, H2 or He tracer gas is injected into the closed static gas pipeline at a time, and tracer gas concentration is detected and recorded at predetermined intervals; and for a dynamic gas pipeline which does not stop conveying, the following operations are carried out, that is, the H2 or He tracer gas is injected into the dynamic gas pipeline continuously, the tracer gas concentration is continuously detected and recorded, and the location of the leakage point of the pipeline is determined based on the tracer gas concentration recorded in the closed static gas pipeline or the tracer gas concentration recorded in the dynamic gas pipeline.

Description

Technical field [0001] The invention relates to the technical field of urban gas pipeline equipment detection, in particular to a method for locating leak points of buried gas pipelines based on tracer gas. Background technique [0002] With the continuous expansion of the scale of cities and the increase of population, the demand for gas is also increasing, and the scale of natural gas pipelines is also expanding. Urban buried pipeline networks are becoming denser and denser, and pipelines are inevitable due to natural aging during operation. Corrosion or man-made damage causes leakage accidents from time to time. Urban natural gas pipelines are mainly laid in densely populated areas and the surrounding environment is more complicated. Once leakage, fire, explosion and other accidents occur, it will cause serious casualties and property losses. [0003] The current detection and positioning of pipeline gas leak points mainly suffer from inaccurate positioning. The conventional det...

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Problems solved by technology

[0002] With the continuous expansion of city size and population increase, the demand for gas is also increasing, the scale of natural gas pipelines is also expanding, and the urban buried pipeline network is becoming more and more dense. Corrosion or man-made damage and other factors lead to leakage accidents from time to time, and urban natural gas pipelines are mainly laid in densely populated areas, and the surrounding environment is relatively complex. Once leakage, fire, explosion and other accidents occur, serious casualties and property losses will be caused

[0003] The current detection and positioning of pipeline gas leakage points mainly have the problem of inaccurate positioning. The conventional detection method is mainly manual inspection. This method uses specific instruments to detect the concentration of flammable gases such as methane to determine whether the pipeline is leaking. For The effect of accurately locating the leak point is not obvious and it is easy to cause misleading effects, because the leakage of natural gas is not as obvious as the leakage of water and oil, and has the characteristics of concealment and fluidity. In the actual gas pipeline leakage repair construction, it often occurs In order to find the situation of multiple excavations at the gas leakage point, especially when the pipeline is buried deep and the leakage is small, the detection error of the complex pipeline environment that crosses and parallels will greatly increase, so only the detection of flammable gas is used to determine the leakage The point method can no longer meet the requirements of leak detection of urban gas pipelines with complex pipelines.

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