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Method for renovation and reinforcement of pipe using basalt fibre complex material

A technology of basalt fiber and composite materials, which is applied in the direction of pipe components, pipes/pipe joints/fittings, mechanical equipment, etc., and can solve problems such as difficult availability of raw materials, lack of basalt fiber pipeline repair and reinforcement, and thick reinforcement layer.

Inactive Publication Date: 2008-06-25
BEIJING SAFETECH PIPELINE
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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
However, the composite material reinforcement technology developed by Beijing University of Science and Technology needs to be further improved due to factors such as high cost, unavailable raw materials, and the fact that carbon fiber precursors are basically completely dependent on imports.
[0003] In recent years, there have been no reports on the use of basalt fibers for pipeline maintenance and reinforcement, and no specific implementation plans have been disclosed.

Method used

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  • Method for renovation and reinforcement of pipe using basalt fibre complex material
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  • Method for renovation and reinforcement of pipe using basalt fibre complex material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Evaluation of the technical scheme of the present invention by the hydraulic blasting test method

[0038] In order to test the effect of the implementation of this technology, φ273 steel pipe is taken as an example to simulate the possible defect sizes of oil and gas pipelines, and the technology is evaluated by the hydraulic blasting test method. Opinions on test tubes and defects figure 1 .

[0039] The test process is as follows:

[0040] 1) Intercept 3m of commonly used pipes for oil and gas pipelines (the pipe is a Q235 spiral welded pipe, the pipe diameter is 273mm, and the wall thickness is 7mm), and both ends are plugged with heads with vent holes and water inlet holes (see figure 1 ).

[0041] 2) Make a defect with a defect size (49mm×18mm×3.5mm).

[0042] 3) Clean up the parts of the pipe body that need to be reinforced to remove the anti-corrosion layer, rust and other dirt on the outer surface of the pipe, and make the surface treatment quality reac...

Embodiment 2

[0048] Similar to Example 1, the basalt fiber composite material is used to reinforce the spiral weld defects, and then the hydrostatic blasting experiment is used to verify the reinforcement effect.

[0049] The experiment process is as follows:

[0050] 1) Intercept the commonly used pipe pipeline 3.5m for oil and gas pipelines (the pipe is a Q235 spiral welded pipe, the pipe diameter is 325mm, and the wall thickness is 7mm), and both ends are plugged with heads with vent holes and water inlet holes.

[0051] 2) Defects of size (length×width×depth=60mm×10mm×5.16mm) are made at the spiral weld of the pipeline.

[0052] 3) Degrease and remove rust on the part of the pipe body that needs to be reinforced.

[0053] 4) Fill the defect with anko filling resin.

[0054] 5) After the surface of the filling material is dry, lay a 500mm wide basalt fiber prepreg on the surface of the pipeline. A total of 10 layers are laid. Then heat it to cure.

[0055] Among them, the preparation proces...

Embodiment 3

[0059] Similar to Example 1, the basalt fiber composite material is used to repair and strengthen the pipeline that needs to be pressurized, and then the hydrostatic blasting experiment is used to verify its reinforcement effect.

[0060] The experiment process is as follows:

[0061] 1) Intercept the commonly used pipe pipeline 3.5m for oil and gas pipelines (the pipe is a Q235 spiral welded pipe, the pipe diameter is 325mm, the wall thickness is 7mm, and the design pressure is 7.3MPa, which is to be increased to 7.8MPa),

[0062] Both ends are sealed with heads with vent holes and water inlet holes.

[0063] 2) Degrease and rust the entire pipe body.

[0064] 3) Coat the surface of the pipe with an epoxy-based curable polymer, and then lay the bidirectional cross-woven basalt fiber along the circumferential direction of the pipe. After rolling, repeat a few more times, laying a total of 8 layers.

[0065] 4) After the reinforcement layer is solidified, the test tube is filled wi...

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Abstract

The invention relate to a method applicable to pipeline, in particular to a method of repairing reinforcing or strengthening a metallic pipe. The main materials used in the invention are basalt fiber reinforcing material and resin basis material. According to the invention, as the strength and the modulus of reinforcing or strengthening materials are similar with those of the metallic pipe body material, the materials used in the invention can be integrated with the pipe body into a whole to bear pressure in the pipe together and finally form a bearing capacity of a composite repairing layer reaching or exceeding the bearing capacity of the original pipe; as the basalt fiber material is insulating, the compatibility between the pipe and cathodic protection and the electrochemical corrosion resistant capacity of the pipe are greatly improved. The method provided by the invention which has simple construction not only facilitates the close attaching between the reinforcing material and the pipe body and between reinforcing layers, but also enables repairing reinforcing and strengthening operations on pipelines in active service.

Description

Invention field [0001] The present invention relates to a technology for repairing and strengthening pipes, especially metal pipes, using resin-based basalt fiber composite materials. More specifically, the present invention relates to a reinforcing material for repairing and strengthening pipes, especially metal pipes. The material is a resin-based basalt fiber composite material, a method for repairing and strengthening pipeline defects with the material, and the application of the material and method in repairing and strengthening oil and gas transportation pipeline defects. Background technique [0002] Oil and gas pipeline transportation is one of the five major transportation industries. At present, there are more than 30,000 kilometers of long-distance oil and gas pipelines in my country. During the long-term service of these pipelines, due to formation pressure, soil corrosion, galvanic corrosion, external force damage, etc., accidents such as pipeline bursts and leakages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L55/175
CPCF16L55/1683
Inventor 阮景红刘国王修云王金友
Owner BEIJING SAFETECH PIPELINE
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