Gas pipe under-pressure leakage-plugging method

Abstract

The invention discloses a plugging method for fuel gas pipeline under pressure during fuel gas leaking. The steps are that 1, a concrete leakage point is found out according to the geographic position where the leakage point happens; packing materials around the leakage point are tore up; 2, after the leakage point are tore up, the leakage point performs the preliminary leakage blocking process; 3, rotproof substances, iron rusts and contaminant on the surface of the pipeline around the leakage point are cleaned up; 4, a patch block is pressed on the leakage point, and an apply force applied on the patch block is adjusted to make the fire resistant cushioning layer on the inner side of the patch block be completely blocked the leakage point; 5, the patch block is welded on the pipeline; 6, the leak detecting and the brush treatment are performed. The leakage blocking method of the invention can perform leakage blocking under the condition that air is not cut off, and can effectively block the leakage point; can avoid the deficiencies that the time consumed by the air cutting leakage blocking method is long, the natural gas resource is wasted, air is polluted, great losses and potential safety hazard are caused, thereby having the evident economic benefit and social benefit.

Description

technical field [0001] The invention relates to a pipeline plugging method, in particular to a gas pipeline leakage plugging method under pressure for plugging the pipeline after the gas pipeline leaks. Background technique [0002] For the sake of safe operation, urban gas pipelines are generally buried underground - buried laying, and overhead laying is mostly not allowed. There are many benefits of buried laying, such as not affecting agricultural cultivation and ground human activities, transportation, strong protection for pipelines, and reducing natural and man-made damage. However, due to natural or man-made reasons, such as natural pipe corrosion, chemical corrosion and other natural reasons, as well as man-made reasons such as drilling, drilling, piling, and bulldozer digging, etc., large or small cracks and holes often occur in gas pipelines, forming gas pipelines. Leakage; and because of its flammable, explosive, toxic and other characteristics, once the combusti...

AI Technical Summary

Problems solved by technology

In the prior art, there is still no method for plugging and repairi