Device and method for leak monitoring of natural gas pipeline

Abstract

The invention belongs to the field of oil gas safety engineering, and particularly relates to a device and method for monitoring natural gas pipeline leakage on line in real time through sensing cables. The method is a novel method for monitoring and positioning natural gas pipeline leakage through the sensing cables at present, and can be used for monitoring and positioning of other hydrocarbon medium pipeline leakage. The sensing cables 5, a resistance detector 1, a cable connector 4, a common cable 3, semi-permeable membrane detection tubes 6 and a front probe 2 are arranged, wherein the resistance detector and the common cable are connected, the common cable and the front probe are connected through the cable connector in an alternating mode, the front probe comprises a plurality of the sensing cables and a plurality of the semi-permeable membrane detection tubes, and the sensing cables are arranged in the semi-permeable membrane detection tubes, so that the aims of online real-time monitoring and positioning of natural gas pipeline leakage are effectively achieved. Accordingly, the device and method have the advantages of being simple in structure, high in flexibility, free of error alarms, long in use period and convenient to overhaul and replace.

Description

technical field [0001] The invention belongs to the field of oil and gas safety engineering, and more precisely relates to a device and method for monitoring leakage of natural gas pipelines. Background technique [0002] Natural gas is a dangerous chemical, flammable and explosive, with an explosion limit of 5% to 15%. If natural gas leaks, it is very easy to form explosive gas, which will cause an explosion when it encounters an open flame. Therefore, natural gas pipeline leakage monitoring and location technology has been paid more and more attention as a technology to ensure the safe operation of pipelines. With the gradual expansion of the natural gas pipeline network and the increasing operating life, pipeline leakage accidents caused by corrosion, aging, third-party damage and other reasons continue to occur. Pipeline leakage not only pollutes the environment, wastes resources, but also poses a huge threat to the safety of people's lives and property. Therefore, it...

AI Technical Summary

Problems solved by technology

When detecting natural gas leakage, due to the chemical reaction between natural gas and the sensing cable, the cable in the contaminated section can only be used once, and the diffusion range of natural gas leakage is large, the contaminated sensing cable is very long, and the pollution range is not easy to determine, and the replacement cost is high

The sensing cable is very thin and is laid above the natural gas pipeline, which is easily damaged by external force and is easily affected by rainy weather, which will cause the sensing cable to fail and reduce the sensitivity of natural gas leak detection

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