Pipe renovation method and its special renovation material system

A system and pipeline technology, which is applied in the direction of pipe components, pipes/pipe joints/fittings, mechanical equipment, etc., can solve problems such as undisclosed product design formulas, and achieve cathodic stripping avoidance, good anti-aging performance, and high practical value. Effect

Inactive Publication Date: 2009-01-14
BEIJING FIRMBASE ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The medium in the pipeline often has a high temperature, and the impregnation glue impregnated with carbon fiber sheets needs to withstand high temperatures when repairing. Currently, except for the US Diamond Wrap There are pro...

Method used

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  • Pipe renovation method and its special renovation material system
  • Pipe renovation method and its special renovation material system
  • Pipe renovation method and its special renovation material system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] 1. Scheme design

[0103] 1. Relevant parameters of defective pipelines:

[0104] Pipe diameter: 325mm

[0105] Pipe length: 3250mm

[0106] Pipe nominal wall thickness: 7.0mm

[0107] The actual wall thickness of the pipe: 6.7mm

[0108] Pipe material material: Q235B steel

[0109] Yield strength of pipe material: 235MPa

[0110] Tensile strength of pipe material: 435~489MPa

[0111] Theoretical burst pressure of flawless pipeline: 18.0~20.2MPa

[0112] Defect depth: 2.8mm, metal loss ratio: 42%

[0113] Defect axial length: 200mm

[0114] Defect circumferential length: 200mm

[0115] 2. Design indicators of carbon fiber composite materials for reinforcement (Table 1):

[0116] Single layer thickness of unidirectional carbon fiber cloth: 0.167mm

[0117] Measured strength of unidirectional carbon fiber cloth: >4000MPa

[0118] Elastic modulus: 235GPa

[0119] Elongation: >1.5%

[0120] Table 1 Performance table of carbon fiber cloth

[0121] pro...

Embodiment 2

[0162] 1. Scheme design

[0163] 1. Relevant parameters of defective pipelines:

[0164] Pipe diameter: 325mm

[0165] Pipe length: 3250mm

[0166] Pipe nominal wall thickness: 7.0mm

[0167] The actual wall thickness of the pipe: 6.7mm

[0168] Pipe material material: Q235B steel

[0169] Yield strength of pipe material: 235MPa

[0170] Tensile strength of pipe material: 435~489MPa

[0171] Theoretical burst pressure of flawless pipeline: 18.0~20.2MPa

[0172] Defect depth: 4.0mm, metal loss ratio: 59.7%

[0173] Defect axial length: 200mm

[0174] Defect circumferential length: 200mm

[0175] 2. Design indicators of carbon fiber composite materials for reinforcement (Table 2):

[0176] Single layer thickness of unidirectional carbon fiber cloth: 0.167mm

[0177] Measured strength of unidirectional carbon fiber cloth: >4000MPa

[0178] Elastic modulus: 235GPa

[0179] Elongation: >1.5%

[0180] Table 2 Performance table of carbon fiber cloth

[0181] p...

Embodiment 3

[0222] 1. Scheme design

[0223] 1. Relevant parameters of defective pipelines:

[0224] Pipe diameter: 325mm

[0225] Pipe length: 3250mm

[0226] Pipe nominal wall thickness: 7.0mm

[0227] The actual wall thickness of the pipe: 6.7mm

[0228] Pipe material material: Q235B steel

[0229] Yield strength of pipe material: 235MPa

[0230] Tensile strength of pipe material: 435~489MPa

[0231] Theoretical burst pressure of flawless pipeline: 18.0~20.2MPa

[0232] Defect depth: 4.7mm, metal loss ratio: 70.1%

[0233] Defect axial length: 200mm

[0234] Defect circumferential length: 200mm

[0235] 2. Design indicators of carbon fiber composite materials for reinforcement (Table 3):

[0236] Single layer thickness of unidirectional carbon fiber sheet: 0.167mm

[0237] Measured strength of unidirectional carbon fiber sheet: >4000MPa

[0238] Young's modulus: 235GPa

[0239] Elongation: >1.5%

[0240] Table 3 Carbon fiber cloth performance table

[0241] prod...

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Abstract

The invention discloses a method for repairing pipelines and a repair material system thereof. The combined material system used for the repair and reinforcement of the pipelines provided by the invention consists of a healant for filling and leveling up the flaws, an anti-negative pole peeling coating, carbon cloth and impregnant rubber. The pressurization test proves that the pipelines repaired by adopting the method and the combined material system of the invention can restore or improve the loading capacity of the pipelines, thereby achieving the loading design standard of the pipelines. The combined material system not only plays the role of repairing and reinforcing the flaws, but also effectively avoids the occurrence of various electrochemical corrosion problems of the flaws. The combined material repair system has easy and practicable repair method and high operability in the process of the repair and reinforcement of the pipelines. The repair material system and the repair technology have very high use value.

Description

technical field [0001] The invention relates to a method for repairing pipelines and a special repair material system thereof. 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 reach about 40,000 kilometers. In addition to this, various enterprises such as refineries, power plants, and chemical plants have a large number of industrial pipelines. Existing pipeline repair methods include welding, clamping and composite material repair, etc. Composite material repair methods mainly focus on carbon fiber composite material repair and glass fiber composite material repair. Clock Spring in the United States 、APPW Products such as Repairing Pipelines Using Glass Fiber Composite Repair Methods, China's PerpeWrap TM 、AnkoWrap TM Products and Black Diamond in the United States 、DiamondWrap And other products use carbon fiber composite materi...

Claims

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Application Information

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IPC IPC(8): F16L55/175
Inventor 杨飞虎肖大舟高宏军伍亨贾冰
Owner BEIJING FIRMBASE ENG
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