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Joint coating method for oil gas pipeline after repairing the corrosion detection

A technology for oil and gas pipelines and defects, which is applied in pipeline anticorrosion/rust protection, pipeline protection, pipes/pipe joints/pipe fittings, etc. It can solve problems such as poor insulation, improve insulation performance, improve insulation sealing effect, and prolong service life Effect

Active Publication Date: 2007-04-25
PETROCHINA CO LTD
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AI Technical Summary

Problems solved by technology

Aiming at the problem of poor insulation of the reinforcing material in the simulated test piece in the wet state, a set of practical methods is provided and applied to the gas pipeline repair site

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] Embodiment: Wrap the reinforcing material on the polished steel pipe to the overlapping surface, apply intermediate glue, and then wrap the joint material. The following construction procedure shall be adopted for repairing defective pipes after reinforcement:

[0019] A. First of all, carry out surface pretreatment on the patching part, remove welding slag, burrs, grease and dirt and other attachments on the surface of the steel pipe, remove dirt, impurities on the original anti-corrosion layer and reinforcing tape, wrapping materials and obvious surface Scrape the concave and convex parts; then use spraying method or mechanical method to remove rust. The quality of surface pretreatment should reach Sa21 / 2 level. Derusting reaches 3mm of exposed silvery white surface.

[0020] B. Treat the defects exposed on the surface of the steel pipe, remove the dust and abrasives attached to the surface, and keep the surface of the steel pipe dry. When rust returns or surface c...

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Abstract

The invention relates to a joint patch method after corrosion bug reinforced of oil pipe, characterized in that reinforced material is winded on the polished steel tube to the joint position, middle glue is pasted and winding patch material is used. Said middle glue comprises 10 size petroleum asphalt and copolymer of vinyl and vinyl acetate, whose weight ratio is 1 to 1-1.3; petroleum resin is 3-10% of the sum of petroleum asphalt and the copolymer of vinyl and vinyl acetate; glass flake is 20-25% of the sum of petroleum asphalt and the copolymer of vinyl and vinyl acetate. The benefit is that insulation performance is improved under the moisture circumstance after oil pipe is strengthened; the quality problem of joint face in anti-corrosion layer, reinforced material, and repairing and strengthening material is solved; the bonding problem between joint material and tube is solved. It improves reinforced insulation sealing performance and prolongs the service life of bug pipe after repairing under the moisture section with more serious corrosion.

Description

technical field [0001] The invention relates to the technical field of repairing oil and gas pipelines, in particular to a repairing method for repairing corrosion defects of oil and gas pipelines and an intermediate glue formula used. Background technique [0002] With the application of oil and gas pipeline composite repair technology in domestic and foreign pipeline industries, how to better apply pipeline composite reinforcement and repair technology to pipelines in humid geographical environment is a difficult problem in oil and gas pipeline composite repair technology. At present, after the pipeline is externally repaired, the reinforcing material is wrapped on the outer wall of the pipeline. In a humid environment, the compatibility and insulation of the interface between the reinforcing material and the original asphalt anti-corrosion layer and the joint material are poor. Through the test method, the compatibility and insulation of the interface between the reinfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L58/02C09J195/00C09J123/08
Inventor 兰翔郑洁马学峰毛华蔡志章
Owner PETROCHINA CO LTD
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