Coal gas pipeline leakage iron box wrapping method

Abstract

The invention provides a gas pipeline leakage iron box repair method, the steps are: 1) making a wedge-shaped cork with a diameter similar to the leak point, and driving the cork into the leak point; 2) wiping the gap between the cork and the leak point Apply sealing paste; 3) According to the size of the leak point, make an iron box with an opening that fits the pipe. At the same time, there are air inlets and exhaust ports on the iron box, and air intake valves and exhaust ports are installed on the air inlet and exhaust ports. One for each valve; 4) Fill the iron box with paste not exceeding 3 / 4 of the volume of the iron box in advance, and buckle the iron box upside down on the leakage point; 5) Introduce nitrogen from the intake valve, and open the exhaust at the same time Valve, install a rubber tube on the exhaust valve, and pull the rubber tube to the area away from the leak point; 6) Apply sealing paste to the gap between the iron box and the pipeline to cut off the gas at the welding part; 7) Confirm the leak point area CO If the concentration is less than 30ppm, weld the iron box and the pipeline; 8) After the welding is completed, turn off the nitrogen, and close the intake valve and exhaust valve.

Description

technical field [0001] The invention relates to a method for repairing the leakage of gas pipelines with iron boxes, in particular to a method for treating leakage of low-pressure gas pipelines of gas systems in metallurgical industries. Background technique [0002] Gas pipelines in the metallurgical industry are generally laid overhead, located outdoors, exposed to long-term wind and sun, and the outer wall of the pipeline is prone to corrosion. In addition, due to the action of other external forces, the pipeline is often torn and traumatized, causing gas leakage. [0003] Gas pipeline leaks, especially after a large number of leaks, because gas is toxic, flammable and explosive, it is often necessary to immediately stop the gas in the pipeline for maintenance. However, the production in the metallurgical industry has great continuity, and the cessation of the supply of gas energy will cause very large economic losses. The utility model introduces a safe and effective me...

AI Technical Summary

Problems solved by technology

[0009] 1. When welding and repairing the board, a large amount of gas leaks from the weld, and the gas is ignited during welding, making the welding very unsafe

And the closure of the weld becomes extremely difficult due to the gas pressure and the condensed water in the gas

[0010] 2. The user's suspension of production caused a huge loss in the economic benefits of the enterprise

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