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On-line repair method for bellows

A repair method and technology for corrugated pipes are applied in the field of online repair of corrugated pipes and online repair of corrugated pipes, which can solve problems such as affecting the shrinkage function of corrugated pipes, affecting the service life of pipe networks, and increasing additional loads of pipelines, so as to protect the safety of life and property. , to ensure stability and continuity, the effect of increasing the service life

Inactive Publication Date: 2009-07-01
上海宝钢综合开发公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Welding repairs on the old gas pipe network, the stress caused by welding will further reduce the corrosion resistance of the aged pipe network, and at the same time, the longitudinal (axial) weld will affect the shrinkage function of the bellows, so it is easier to produce cracks and affect the pipe network service life
Adding a bellows will significantly increase the additional load of the pipeline. This load includes the weight of the newly installed bellows and the weight of condensate, impurities, etc. leaked between the old bellows and the new bellows. The pipeline network with severe corrosion and operation is also a heavy burden

Method used

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  • On-line repair method for bellows

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: On-line repair of the leakage points on several corrugated pipes on a certain blast furnace gas pipeline.

[0030] (1) Quick plugging

[0031] Carry out on-site inspection, analysis and testing of bellows leakage status and propose treatment measures. It can be dealt with according to points, lines, surfaces, etc. If necessary, anti-expansion treatment should be carried out first to prevent further expansion of the leak. If the leak is large, it should be plugged with fiber fabric first; Use a flexible composite adhesive to stick one or several layers of glass fiber cloth to plug the leak, and then cover a reinforced metal sheet on the glass fiber cloth; there should be a sealing surface of 10-15mm around the leak. Carry out 24-hour inspection on the quick plugging site to ensure that the leak will not leak again in a short period of time.

[0032] (2) Pretreatment of the repaired surface

[0033] Pollution, oxidation, rust, etc. on the metal surface will ...

Embodiment 2-4

[0044] Examples of the preparation of flexible composite adhesives are shown in Table 1:

[0045]

[0046] The corrugated pipe repaired by the flexible composite adhesive of the invention can work normally for 3 to 5 years in outdoor natural environment.

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Abstract

An online repairing method for corrugated pipes comprises quickly plugging, pretreating a repairing surface, activatedly processing the repairing surface, laying strengthening layer, sticking a protective film, and curing for 24h at room temperature. The flexible composite adhesive for repairing has the components by weight percentage: 4.7-4.9 of vulcanization paste, 3.3-3.5 of alkyl phenol-formaldehyde resin, 0.45-0.75 of 2-mercaptobenzothiazole, 0.10-0.80 of (3-gamma-triethoxysilylpropyl)-tetrasulfide, the balance being Thiokol. The method can repair and strengthen on-line the corrugated pipes in the pipelines at normal temperature and pressure without open fire, and has the advantage of safety, reliability, energy and environment conservation, thereby having low influence to equipment, lower repairing cost than the cost of jacketing a new corrugated pipe, expanding space for repeatedly repairing, and greatly increasing the service life of the equipment.

Description

technical field [0001] The invention relates to pipeline online repair technology, in particular to an online repair method for corrugated pipes, in particular to an online repair method for bellows pipes connected to gas pipelines or power pipelines similar to gas pipelines. Background technique [0002] In the power pipe network system, in order to prevent the additional stress caused by thermal expansion and contraction of the pipeline during the operation of the pipe network and other stresses that will cause the deformation and damage of the pipe network and endanger the safety of production, it is stipulated that bellows (also known as expansion pipes) must be installed in relevant parts. Section) to absorb the additional stress caused by uneven deformation such as thermal expansion and contraction, so as to ensure the safe operation of the pipe network. [0003] In the gas pipeline network, in addition to carrying the medium gas, the bellows also have the functions of...

Claims

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Application Information

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IPC IPC(8): F16L55/17F16L55/175
Inventor 沈春杰施健张龙宝喻一平陈林华
Owner 上海宝钢综合开发公司
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