Device and technology for repairing pipeline circumferential weld defects through epoxy steel sleeve

A technology of girth weld and epoxy steel, which is applied in the direction of pipe components, pipes/pipe joints/pipes, mechanical equipment, etc., can solve the problems of embrittlement and cracking of filled resin materials, unsatisfactory requirements, and design of solidified bubble sleeves. Achieve the effect of solving embrittlement cracking, improving integrity and reliable performance

Inactive Publication Date: 2020-02-07
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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Problems solved by technology

However, there are currently no authoritative epoxy steel sleeve repair technologies and products on the domestic market, and there are many engineering practice problems in t

Method used

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  • Device and technology for repairing pipeline circumferential weld defects through epoxy steel sleeve
  • Device and technology for repairing pipeline circumferential weld defects through epoxy steel sleeve
  • Device and technology for repairing pipeline circumferential weld defects through epoxy steel sleeve

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[0033] The present invention will be described in detail below with reference to the accompanying drawings.

[0034] Devices for repairing pipeline girth weld defects such as figure 1 shown:

[0035] Composite epoxy steel sleeve

[0036] 1) Sleeve material and size design

[0037] a) The material of the steel sleeve is made of the same material as the pipeline 1 to be repaired or higher than the steel grade of the pipeline. For high-grade steel pipes, the use of high-grade steel sleeves can greatly reduce the wall thickness of the steel shell and reduce the weight. Facilitate construction.

[0038] b) The wall thickness of the steel sleeve is designed according to the following formula:

[0039]

[0040] In the formula: p——the maximum allowable pressure of the pipeline, the unit is MPa;

[0041] D - the inner diameter of the sleeve, in millimeters (mm);

[0042] σ s - the specified minimum yield strength of the sleeve material, in megapascals (MPa);

[0043] φ——0.8 ...

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Abstract

The invention discloses a device and technology for repairing pipeline circumferential weld defects through an epoxy steel sleeve. The device comprises the composite epoxy steel sleeve, a vacuum pumpand a colloid filling device. The steel sleeve is arranged on the outer side of a to-be-repaired pipeline. Fiber cloth is wound around the outer wall of the to-be-repaired pipeline. A gap is formed between the fiber cloth and the inner wall of the steel sleeve. Sealing bodies are arranged between the inner walls of the two ends of the steel sleeve and the pipeline. Filling colloid is arranged in the gap among the steel sleeve, the to-be-repaired pipeline and the sealing bodies. A locating thread hole is formed in the steel sleeve in the radial direction. A vacuumizing opening/colloid overflowing opening and an exhausting/observing hole are formed in the top of the steel sleeve in the flowing direction of the colloid. The invention discloses a repairing technology. According to the device and the technology, the problems of tender cracking, curing bubble and cavities of filling resin of a traditional epoxy steel sleeve can effectively solved, good compatibility can be ensured between the composite epoxy steel sleeve and a steel pipe body, the circumferential load and the axial load borne by pipeline circumferential weld are shared, and axial cracking of the circumferential weld defects is restrained.

Description

technical field [0001] The invention belongs to the technical field of pipeline defect repair, and in particular relates to a device and a process for repairing pipeline girth weld defects with an epoxy steel sleeve. Background technique [0002] Oil and gas pipeline transportation is one of the five major transportation industries. my country's current oil and gas pipelines have exceeded 120,000 kilometers. Oil and gas pipelines often form various pipe body defects due to manufacturing welding defects, internal and external corrosion, third-party damage, etc., resulting in accidents such as pipeline bursts and leakages, which seriously affect the safe operation of the pipeline and the ability to transport operations. Effective repair and reinforcement of body defects is a key technical measure to ensure safe operation of pipelines and improve transportation efficiency. Existing pipeline repair technologies include welding scar repair, sleeves, clamps, pipe replacement, and...

Claims

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Application Information

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IPC IPC(8): F16L55/168F16L55/175
CPCF16L55/1686F16L55/175
Inventor 马卫锋任俊杰王珂曹俊聂海亮蔡克宋恩鹏罗金恒赵新伟
Owner BC P INC CHINA NAT PETROLEUM CORP
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