Method for reinforcing defective pipeline and composite material therefor

Abstract

The invention discloses a defect pipe reinforced method and composite material, which is characterized by the following: adapting reinforced composite material, defect filling material and interlaminar adhesive agent to restore and reinforce the defect position; disposing the defect surface only; filling the defect position with the reinforced filling material; wrapping the reinforced film on the pipe; adapting interlaminar adhesive agent and hardening agent among layers, wherein the reinforced composite material piece is high-strength glass fiber unidirectional cloth or carbon fiber unidirectional cloth, which is composed of 593 hardening agent or triethanolamine hardening agent, epoxide-resin glue of acrylate liquid rubber and interlaminar adhesive agent. The invention can restore the defect pipe of more than half thickness without welding, leakage and cracking, which displays normal pipe after restoring the explosion-hole.

Description

technical field [0001] The invention relates to a method for reinforcing pipelines containing defects, which uses composite materials to repair and reinforce corrosion defects on the outer wall of oil and gas transmission pipelines, and composite materials thereof. Background technique [0002] Corrosion defects on the outer wall are one of the common types of defects in oil and gas transmission pipelines during service. The existence and development of these defects will seriously affect the safety of pipeline operation. How to effectively repair and reinforce such corrosion defects is the key to ensure Key technical measures for the safe operation of pipelines and improving the efficiency of oil and gas gathering and transportation. For the repair of such defects, at present, the methods of on-site welding to repair scars, sleeve sleeves or segmental cutting and re-welding of new pipe sections are mainly used in China. The safety of operation; (2) high repair costs; (3) h...

AI Technical Summary

Problems solved by technology

For the repair of such defects, at present, the methods of on-site welding to repair scars, sleeve sleeves or segmental cutting and re-welding of new pipe sections are mainly used in China. The safety of operation; (2) high repair costs; (3) hydrogen embrittlement, residual stress and other problems are likely to occur during the welding process; (4) the technical level of welding operators is high, and necessary on-site flaw detection is required after welding; (5) During the repair period, the pipeline sometimes needs to stop running, and the oil and gas in the pipeline need to be emptied, especially the gas pipeline, which will cause huge economic losses. Therefore, the repair of the pipeline with corrosion defects on the outer wall must develop a new repair and enhancement technology

Abroad, there is a method for repairing pipeline defects by adopting the "special firm" brand fiberglass reinforced sheet produced by CLOCK SPRING COMPANY L P (US) (the product patent number is: US5683530), but the cost of this method is relatively high (every repair of a defect The cost is about 500 US dollars), the strength is low, and the main components of the product are prone to failure (the shelf life is half a year), so it has not been popularized and applied

Some domestic research has been carried out on FRP reinforcement technology and product development, but in general, FRP reinforcement and repair research has been carried out less, and the performance and repair process of some products are unstable, and the strength is difficult to meet the pipeline pressure requirements

However, the matching between the polymer resin and the pipe material and the resin and the reinforcing fiber used in the external winding FRP reinforcement technology, including expansion coefficient, elastic modulus and strength, have not been studied in depth, which also greatly affects the promotion of FRP reinforcement technology. application

For pipelines with defects, the thickness of the outer winding FRP is more than 10mm according to experience, and the amount is too much for pipelines with small defects, resulting in an unnecessary increase in repair costs; for pipelines with large defects, the purpose of safe repair cannot be achieved.

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