Totally-enclosed examination and repair process with pressure for feedwater piping

Abstract

The invention relates to a water supply pipeline full-sealing maintenance process with pressure; the maintenance process is characterized in that: compressed air is used for expanding a balloon on the internal wall of the pipeline so as to form a sealing section which can hold back the leaked water of the pipe before the operation; after the operation is completed, the compressed air in the balloon is let out; the volume of the balloon is contracted under the action of the elastic force and the balloon can be taken out of a process hole; after the process hole is sealed, the pipeline running can be recovered. The technical performance and characteristic are that the sealing pressure is less than or equal to 0.1MPa, the maximum expansion diameter achieves 1200mm, and the diameter of the process hole is controlled below Phi 80mm. the maintenance process greatly improves the maintenance speed, quality and safety performance of the water supply pipeline, basically avoids the leakage of water medium in the maintenance operation, realizes the energy-saving and exhaust reducing of cleaned water and sewage water, improves the maintenance efficiency of the blast furnace water supply system and increases the safety performance of the blast furnace water supply system.

Description

technical field [0001] The invention belongs to the technical field of water supply and drainage, and relates to a fully-enclosed pressurized maintenance process for water supply pipelines. Background technique [0002] At present, in the construction of gas pipelines under pressure, if the pipeline valves are not closed tightly and the pipeline operation cannot be stopped in a large area at the same time, an inflatable rubber bladder is often used inside the pipeline. When the compressed air is filled, the rubber bladder expands. , the diameter increases until the entire pipeline flow section is blocked, thereby achieving a temporary seal. And for this sealing rubber bag of gas pipeline, there are many defectives in the sealing that is applied to water medium environment: 1, gas pressure is generally low, about KPa unit, and the shut-off airtight pressure of water is all above 0.1MPa. 2. The size of the gas rubber bladder is very large, and a large process hole needs to be...

AI Technical Summary

Problems solved by technology

For the sealing rubber bladder of the gas pipeline, there are many defects in the sealing applied to the water medium environment: 1. The gas pressure is generally low, about KPa units, and the shut-off and sealing pressure of water is above 0.1MPa.

2. The size of the gas rubber bladder is very large, and a large process hole needs to be opened, and the larger the process hole on the water pipe, the greater the workload and difficulty, and the more difficult it is to control the quality

3. The natural state of the gas rubber bladder is too soft to overcome the hydraulic impact, so it is difficult to control the state when the flow rate is large

4. The wall thickness of the gas rubber bladder is too thin, and it is easy to be damaged in rough or sharp water pipes

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