Method for stopping leakage of gas pipeline without gas stopping and welding

Abstract

The invention discloses a method for stopping the leakage of a gas pipeline without gas stopping and welding, which comprises the following steps of: (1) finding a leakage point of the gas pipeline and cleaning the leakage point; (2) installing a leaking stoppage device of which the diameter is matched with that of the gas pipeline at the periphery of the leakage point of the gas pipeline and putting a soft sealing briquette between an arc-shaped compression block of the leaking stoppage device and the leakage point of the gas pipeline; (3) rotating a compression screw of the leaking stoppage device to push the arc-shaped compression block to move radially, and pushing the soft sealing briquette by the arc-shaped compression block to press the leakage point until the soft sealing briquette plugs the leakage point completely; and (4) screwing in a fine-adjustment stop screw on the leaking stoppage device, so that the fine-adjustment stop screw is acted on the arc-shaped compression block. The gas pipeline can be subjected to leaking stoppage under the conditions of no gas stopping, no depressurization, no welding and no need of glue connection or injection, and the leakage point can be plugged effectively; and the leakage stoppage method has the advantages of convenient and quick operation of leaking stoppage and great economic and social benefits, wherein the leaking stoppage can be completed within 5 to 10 minutes.

Description

technical field [0001] The invention relates to a method for plugging leaks in pipelines transporting combustible gas, especially a method for plugging and repairing gas pipelines by adopting the repair method of non-stop gas, no pressure reduction, no welding, no glue bonding or pouring , is a plugging form using a new pipe fitting. Background technique [0002] Gas pipelines are used as pipelines for transporting combustible gases, such as natural gas, coal gas and other gases. Due to natural or man-made reasons, such as natural reasons such as natural corrosion of pipelines, chemical corrosion, and man-made reasons such as drilling, drilling, piling, and bulldozer excavation, etc., Large or small cracks and holes are often produced, forming gas leakage; and due to the characteristics of flammable, explosive, and toxic gas, once the flammable gas in the gas pipeline leaks, it must be plugged immediately to prevent it from leaking in large quantities. leakage. Now the com...

AI Technical Summary

Problems solved by technology

This method does not stop production during operation, and performs no open flame plugging operation under normal working conditions, so accidents such as explosions and fires will not occur, ensuring safe production; however, it has the disadvantages of cumbersome and inconvenient operations, and is only suitable for Low-pressure pipelines are more risky for high-pressure pipeline plugging operations, and the plugging operation takes a long time. Generally, it takes several hours or even longer, and the leak point of the pipeline needs to reach about 80°C. The life of the missed mixture is difficult to meet the requirements

[0004] In the invention patent application document named "Gas Pipeline Leakage Plugging Method under Pressure" and patent application number 200710092780.7, it is disclosed that after the gas pipeline leaks, first find the leak point, and after cleaning, use the same or basic material as the pipeline. The patch block with the same shape and matching the outer surface of the pipeline is pressed on the leak point, and the force acting on the patch block is adjusted so that the high temperature resistant cushion layer inside the patch block completely seals the leak point, and then the patch block is welded on the pipeline above; this method requires welding and generates an open flame, which is an open flame plugging operation, and there are hidden dangers of explosions, fires and other accidents, which is not conducive to safe production; and in the field, the welding operation is not convenient; the required operating space is large , the plugging operation takes a long time; more importantly, this method cannot fundamentally solve the risk of explosion

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