Combustible gas detector arrangement method for gas transmission trunk line valve chamber

Abstract

The invention discloses a gas transmission trunk line valve chamber combustible gas detector arrangement method, and belongs to the technical field of oil and gas pipelines. The method comprises the following steps that a station yard gas quality analysis cabin is used for collecting natural gas components conveyed by a gas conveying main line and pipeline operation parameters; calculating natural gas physical property parameters according to the natural gas component information and the pipeline operation parameters; calculating the leakage rate of each component of the natural gas under the working condition of valve chamber leakage; and according to the calculated leakage rate, a suggested installation mode of the combustible gas detector in the valve chamber is given in combination with natural gas physical property parameters. According to the arrangement method of the valve chamber combustible gas detector, the defect that a detection blind area possibly exists or the detection time is greatly prolonged when the valve chamber combustible gas detector is arranged only according to standard specification suggestions in the prior art is overcome, and the safe operation level of a gas transmission main line valve chamber is improved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas pipelines, and relates to a method for arranging combustible gas detectors in valve chambers of gas transmission trunk lines. Background technique [0002] In the natural gas pipeline industry, gas pipeline leaks occur from time to time, and natural gas leaks have the characteristics of being difficult to detect, spreading quickly, and potentially harmful. For the main gas transmission line, the pipeline is usually set at a certain distance or in a special location with a cut-off valve room to divide the main gas transmission line into multiple sections. It can play the role of shortening the venting time, reducing the amount of natural gas venting, and finally reducing economic losses and accident consequences. Usually, in addition to the main line emergency shut-off valve, there is a bypass branch pipe in the shut-off valve chamber, which is connected to the venting system of the valve cham...

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Problems solved by technology

[0006] The present invention aims to solve the problem that there is a detection blind spot when the installation method of the combustible gas detector in the cut-off valve chamber of the gas transmission main line is formulated according to the suggestion of the current standard specification, and the detection time is long under some leakage conditions, which leads to the installation of combustible gas detection. In view of the problems that the gas detector does not work well, a method for determining the installation method and location of the combustible gas detector in the valve chamber is proposed based on the advantages of the current gas transmission station gas analysis hut that can easily obtain the gas composition and pipeline operating parameters

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