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Strengthening carbon fiber composite material and method for repairing defective pipeline

A composite material and pipeline repair technology, applied in the field of technology, can solve the problems of low elastic modulus and strength, inability to ensure that the composite sheet and the pipe body are closely fitted, and the improvement of the bearing capacity of the matrix is ​​limited.

Inactive Publication Date: 2005-05-18
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two disadvantages of this technology: one is that during the construction process, it is impossible to ensure the close fit between the composite sheet and the pipe body, and between the layers of the composite sheet; the other is that the elastic modulus and strength of the glass fiber are relatively low. Low, so the thickness of the reinforcing layer will be thicker, which will cause certain difficulties for subsequent anti-corrosion, and the degree of improvement in the bearing capacity of the matrix is ​​also very limited
[0003] In recent years, there have been some reports on the use of carbon fibers to reinforce metal pipeline damage defects, but no specific implementation has been disclosed

Method used

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  • Strengthening carbon fiber composite material and method for repairing defective pipeline
  • Strengthening carbon fiber composite material and method for repairing defective pipeline
  • Strengthening carbon fiber composite material and method for repairing defective pipeline

Examples

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Effect test

Embodiment 1

[0074] Embodiment 1: The technical solution of the present invention is evaluated by the hydraulic blasting test method

[0075] In order to test the implementation effect of this technology, taking φ660 gas transmission steel pipe as an example, the size of the defect that may exist in the gas transmission pipeline is simulated, and the technology is evaluated by hydraulic blasting test method. See Figure 1 for the test tube and its defects. The test process is as follows:

[0076] Cut a 5.45m pipe of the same size and material as the main line of a gas pipeline (the pipe is an X60 spiral welded pipe with a diameter of 660mm, a wall thickness of 8.7mm, and a design working pressure of 6.4Mpa), and leave The heads of the exhaust holes and water inlet holes are blocked (see Figure 2).

[0077] Clean the parts of the pipe body that need to be reinforced to remove the anti-corrosion layer, epoxy coating and dirt on the outer surface of the pipe, and make the surface treatment qu...

Embodiment 2

[0080] Example 2: Repair and reinforcement of natural gas pipeline defects

[0081] The field embodiment of the technology of the present invention is an example of defect reinforcement applied to the Shaanxi-Beijing gas pipeline. The defect at this place is reinforced by using the reinforcing material and repairing and reinforcing method described in the present invention. The specific implementation process is as follows:

[0082] 1. Excavation and surface cleaning of pipelines

[0083] The defect point of reinforcement construction is located somewhere in a certain section of Shaanxi-Beijing pipeline. The site is located on the edge of the desert, with a sandy soil structure, the surface water layer is relatively shallow, the buried depth of the pipeline is about 1300mm, and the external surface temperature of the pipeline is about 40°C. The tube body has three mechanical damages. One is an obvious mechanical scratch, 150mm long, 3.5mm deep, and the deepest width is 20m...

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Abstract

The pipeline repairing and reinforcing material includes repairing glue layer for repairing and leveling the outer pipeline fault; carbon fiber sheet painted or dipped with glue for restoring and raising the bearing strength of the fault part; and anticorrosive material layer for the outer surface. The repairing and reinforcing material of the present invention has specific strength and specific module near that of the metal pipe material, can bear the pressure inside the pipe together with the pipe and reach or even exceed the bearing capacity of the pipe. The present invention may be used in repairing pipeline without stopping conveyance.

Description

field of invention [0001] The present invention relates to a technique for repairing and reinforcing defective pipelines, especially metal pipelines, with resin-based carbon fiber composite materials. More specifically, the present invention relates to reinforcement for repairing and reinforcing defective pipelines, especially metal pipelines containing defects A material, the material is a resin-based carbon fiber composite material, a method for repairing and reinforcing pipeline defects by using the material, and an application of the material and method in repairing and strengthening oil and gas transmission pipeline defects. Background technique [0002] Oil and gas pipeline transportation is one of the five major transportation industries. At present, my country's long-distance oil and gas pipelines alone have reached more than 30,000 kilometers. During the long-term service of these pipelines, due to the effects of formation pressure, soil corrosion, galvanic corrosio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K7/06C08L63/00F16L55/16F16L55/168
CPCF16L55/1683
Inventor 路民旭张玉芳董绍华葛艾天陈迎锋李宝瑞张国安
Owner UNIV OF SCI & TECH BEIJING
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