Method for performing gas pipeline leakage position by using instant change on-line diagnosis coupling excitation frequency response

Abstract

The invention provides a method which uses transient online diagnosis coupling frequency response to position the leakage of natural gas pipeline, and relates to a natural gas pipeline failure detection and positioning method which can solve the problems that the existing method for detecting and positioning the leakage of the natural gas pipeline can not detect in real time, has long detection period, low positioning precision and high error report rate; real-time pressure value and real-time flux value are respectively collected at the upstream and downstream of the pipeline; the real-time downstream pressure value and the real-time flux value when the pipeline runs stably are reduced by the practical real-time pressure value and the practical real-time flux value at the downstream; if both of the two differences exceed the valve value, the leakage is considered to occur, otherwise the values are collected again; an excitation pressure wave is generated at the downstream end of the pipeline and the wave speed of the response wave of the excitation pressure wave is gained; according to the wave speed of the excitation pressure response wave and the time difference when the excitation pressure response wave is transmitted to the upstream and the downstream, the position of the leakage point is gained. The measurement and collection of the values are completed by normal equipments and the method can be used both in the built pipeline or pipelines under construction.

Description

technical field [0001] The invention relates to a method for detecting and locating natural gas pipeline faults, in particular to a method for locating natural gas pipeline leakage by using transient on-line diagnosis coupling excitation frequency response technology. Background technique [0002] Pipeline transportation is one of the important basic structures of social economy and has become the lifeblood of modern industry and national economy. Pipeline transportation has unique and outstanding advantages in the transportation of bulk goods such as gas, liquid, and slurry. Airtight, high efficiency, low loss; can adapt to various complex terrain, landform and climate conditions. However, during the operation of natural gas pipelines, leakages are often caused by accidents such as corrosion, third-party damage, and natural disaster damage. After natural gas leaks, it will not only cause the loss of natural gas resources, but also cause accidents such as explosions, fires...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems existing in the existing natural gas pipeline leakage detection and positioning methods that real-time detection cannot be realized, the detection period is long, the positioning accuracy is low, and the false alarm rate is high, the present invention provides a coupling excitation frequency using transient online diagnosis. Method for locating natural gas pipeline leaks

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