Dual-layer pipe wall composite-type gas pipeline and leakage monitoring method

Abstract

The invention relates to a dual-layer pipe wall composite-type gas pipeline and a leakage monitoring method for the pipeline, in order to mainly solve the problems that the gas pipeline operation safety in the high-hazard region is insufficient and the leakage point is difficult to confirm. The dual-layer pipe wall composite-type gas pipeline is characterized in that a clearance cavity is arranged between an inner pipe and an outer pipe; nitrogen displacement is carried out in the clearance cavity; the top of the outer wall of the outer pipe is provided with a plurality of vertical branch pipes communicated with the clearance cavity; the top ends of the vertical branch pipes are provided with concrete plates for sealing; the side wall of the outer pipe is communicated with a branch pipe which is bent downward; the tail end of the branch pipe is provided with a pressure blasting plate; the bottom surfaces of the concrete plates are provided with combustible gas probes which extend into the vertical branch pipes and are respectively connected to a combustible gas alarm and an industrial control computer in a remote monitoring room through a simulation signal wire and an RS485 data bus cable; and the industrial contro computer is used for calculating the position of pipeline leakage. The method can be used for determining the leakage point safely and rapidly.

Description

technical field [0001] The invention relates to the improvement of the structure of the urban gas buried pipeline, in particular to a double-wall composite gas pipeline, and also provides a leakage detection method when the pipeline is used to transport the urban gas, which belongs to the pipeline technology field. Background technique [0002] Urban gas pipelines are mostly buried underground in high-risk areas such as densely populated and trafficked areas. Since the pipelines are eroded by soil solution for a long time and there are many users of urban gas pipelines, it is impossible to add cathodic protection, and the walls of the pipelines will gradually become thinner and perforated. , causing gas leakage. Most of the current urban gas supply pipelines have a pressure range of 0.2-0.4MPa, which belong to medium-pressure pipelines. Most of the pipeline leakage is underground corrosion and perforation leakage. Due to the complexity of the surrounding environmental fact...

AI Technical Summary

Problems solved by technology

[0002] Urban gas pipelines are mostly buried underground in high-risk areas such as densely populated and trafficked areas. Since the pipelines are eroded by soil solution for a long time and there are many users of urban gas pipelines, it is impossible to add cathodic protection, and the walls of the pipelines will gradually become thinner and perforated. , causing a gas leak

Most of the current urban gas supply pipelines have a pressure range of 0.2-0.4MPa, which belong to medium-pressure pipelines. Most of the pipeline leakage is underground corrosion and perforation leakage. Due to the complexity of the surrounding environ...

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