Flexible plugging sheet, under-pressure plugging structure and under-pressure plugging method for gas pipeline

Abstract

The invention discloses a flexible plugging sheet, under-pressure plugging structure and under-pressure plugging method for a gas pipeline. The flexible plugging sheet for the gas pipeline comprises 5-10 parts of tackifying resin, 10-15 parts of modified butyl rubber and the like. The under-pressure plugging structure comprises a sealing plugging structure, a fixing structure and an outer protection structure. The under-pressure plugging method for the gas pipeline comprises the steps that 1, the flexible plugging sheet is placed on the gas pipeline and covers a leakage hole in the gas pipeline; S2, the periphery of the flexible plugging sheet is coated with a fast curing adhesive, and the thickness of the fast curing adhesive is consistent with the thickness of the flexible plugging sheet. When the flexible plugging sheet is mounted, gas supply stopping and pressure reducing are not needed, ignition is not needed, and the safety risk of on-site under-pressure plugging is greatly reduced. A flexible material is adopted as the sealing plugging structure, secondary damage to the pipeline is avoided, it is avoided that the sealing plugging structure fails due to heat expansion and cold contraction of the pipeline, and the sealing plugging structure can be used for permanent repairing.

Description

technical field [0001] The invention relates to the field of repairing gas pipelines, and specifically provides a flexible plugging sheet for gas pipelines, a pressure plugging structure and a plugging method thereof. Background technique [0002] At present, gas pipelines in some cities in my country have entered the anti-corrosion layer aging stage and accident-prone period. Corrosion and leakage and perforation accidents caused by third-party construction occur frequently. Once natural gas leakage occurs, it will bring serious social impact and safety hazards. [0003] Gas stop and pipe replacement is currently the most common emergency repair method for urban gas pipelines. Its advantage is that the construction technology is mature, and the safety hazard of the leakage point can be completely solved through repair welding or pipe replacement. However, this method has great limitations: first, the requirements for the construction environment are relatively high, and it ...

AI Technical Summary

Problems solved by technology

However, this method has great limitations: first, the requirements for the construction environment are relatively high, and it is necessary to consider whether the site has ground-breaking excavation conditions, whether there is operating space for welding personnel, and whether open flame operations are allowed; second, the venting volume of natural gas is One of the factors causing the gas company's poor transmission will bring a certain degree of economic loss; the third is that the normal life and production gas consumption of users will be affected during the gas outage, causing economic losses to users, which is not conducive to the social impact of the gas company's service quality, And the potential safety risks in the process of shutting down and restoring gas supply are also serious problems

[0004] There is also a commonly used mechanical clamp that can be used for plugging under pressure, but the mechanical external force provided by the clamp may cause stress concentration in the pipeline, causing secondary damage to the pipeline

And this method usually uses a rubber ring to seal the inside of the fixture. As time goes by, the rubber ring is prone to aging and brittleness, resulting in seal failure.

Moreover, this method is only applicable to straight pipe sections, and cannot be used for pipe fittings such as elbows, tees, or small and large heads.

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