Renovation reinforcement, reinforced and/or crack arrest technique for pipe

A pipeline and reinforcement technology, applied in the direction of pipeline protection, protection of pipelines by thermal insulation, pipes/pipe joints/pipe fittings, etc.

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

For the form of thickening the steel ring on the outer wall of the pipe, since the steel ring itself is also a metal structure and has a large thickness, it is clamped on the outer wall of the pipe, which is not easy to protect the pipe and the fixture uniformly, and there is a phenomenon of corrosion
For the local thickening of the pipe wall and the improvement of the mechanical properties of the pipe, it is obvious that higher requirements are put forward for the processing technology of the pipe, and the thickening of the pipe wall will also bring troubles to the subsequent management of the pipe.
In addition, the above three crack arrest methods are not suitable for PE pipes, nor for special-shaped pipes.
[0010] In recent years, there have been no reports on the use of several fibers, especially the combination of insulating materials and other high-strength fiber composite materials for pipeline repair and reinforcement, and there has been no report on the application of insulation materials and high-strength fiber composite materials for pipeline repair. arrest report

Method used

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  • Renovation reinforcement, reinforced and/or crack arrest technique for pipe
  • Renovation reinforcement, reinforced and/or crack arrest technique for pipe
  • Renovation reinforcement, reinforced and/or crack arrest technique for pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] Example 1: Laying insulation material as the insulation performance of the composite material layer of the bottom layer

[0113] After the pipeline is reinforced with insulating material as the bottom layer, the insulation performance of the reinforced pipeline is tested. The pipe used is a steel pipe of φ60mm, and repaired according to the following steps:

[0114] 1) Clean 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 reach the St3 level specified in GB / T8923-1988.

[0115] 2) The defect is filled with filling material epoxy mortar.

[0116] 3) After the surface of the filling material is dry, apply 2130 phenolic resin glue on the surface of the pipe, then lay unidirectional basalt fiber with a width of 300mm along the circumferential direction of the pipe, and roll it so that the curable polymer can be evenly impregnated with the u...

Embodiment 2

[0120] Embodiment 2: The technical solution of the present invention is evaluated by the hydraulic blasting test method

[0121] In order to test the implementation effect of the technical solution of the present invention, taking φ273 steel pipe as an example, simulating the size of defects that may exist in oil and gas pipelines, and evaluating the technology by using the hydraulic blasting test method. Test tubes, see image 3 , the schematic diagram of the defects on the experimental pipeline is shown in Figure 4 . The test process is as follows:

[0122] 1) Cut off 3m of commonly used pipes for oil and gas pipelines (the pipe is Q235 spiral welded pipe with a diameter of 273mm and a wall thickness of 7mm), and seal both ends with heads with vent holes and water inlet holes (see image 3 ).

[0123] 2) Make a defect whose size is 40mm×13.5mm×3.5mm.

[0124] 3) Clean the parts of the pipe body that need to be reinforced to remove the anti-corrosion layer, rust and oth...

Embodiment 3

[0129] Embodiment 3: The technical solution of the present invention is evaluated by the hydraulic blasting test method

[0130] Similar to Example 1, the spiral weld defect is reinforced with composite materials, and then the reinforcement effect is verified by hydrostatic blasting experiments.

[0131] The experimental process is as follows:

[0132] 1) Cut off 3.5m of commonly used pipes for oil and gas pipelines (the pipe is Q235 spiral welded pipe with a diameter of 325mm and a wall thickness of 7mm), and seal both ends with heads with vent holes and water inlet holes.

[0133] 2) Make a defect with a size of (length×width×depth=60mm×10mm×5.16mm) at the spiral weld of the pipeline.

[0134] 3) Degrease and derust the parts of the pipe body that need to be reinforced.

[0135] 4) Fill the defect with epoxy filling resin.

[0136] 5) After the surface of the filling material is dry, lay a 500mm wide aramid (1414) fiber prepreg (prepreg made of aramid fiber and epoxy resi...

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Abstract

The invention relate to a method applicable to pipeline, in particular to a method of repairing reinforcing and / or strengthening a metallic pipe and a pipe crack arrest method, which is characterized in that: a part of a pipe needing repairing reinforcing and / or strengthening or needing crack arrest is firstly coated with insulating material, and then high strength fiber composite material is applied. As the materials used in the invention and the material used in the metallic pipe body portion a similar elastic modulus, the materials used in the invention can be integrated with the pipe body to bear pressure in the pipe together and finally form a bearing capacity required by the composite pipe, such as the original maximum working pressure of the pipe restored; furthermore, the materials used in the invention have good crack arrest function in case of a pipe burst accident. In addition, the insulating material used in the bottom layer completely removes the possibility of galvanic corrosion between the pipe and the reinforcing material. The method provided by the invention which has simple construction without fire work 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

technical field [0001] The present invention relates to the technology of repairing, reinforcing, strengthening and / or crack arresting of pipelines, especially metal pipelines, with insulating materials and fiber composite materials, more particularly, the present invention relates to the combination of insulating composite materials and high-strength resin-based fiber composite materials A method for repairing, reinforcing, strengthening and / or relieving cracks in combination with the pipeline, and the application of the method in the transmission pipeline. Background technique [0002] Oil and gas pipeline transportation is one of the five major transportation industries of the national economy. At present, my country's long-distance oil and gas pipelines alone reach more than 50,000 kilometers. During the long-term service of these pipelines, due to the effects of formation pressure, soil corrosion, galvanic corrosion, and external force damage, accidents such as pipeline...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L55/168
CPCF16L59/10F16L55/1683
Inventor 路民旭王修云阮景红刘国王金友
Owner BEIJING SAFETECH PIPELINE
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