Connecting joint of fiber enhanced thermoplastic plastic composite continuous pipe and method

Abstract

The invention relates to a connecting joint of a fiber enhanced thermoplastic plastic composite continuous pipe and a method, which are achieved by connecting convex joints and concave joints. The convex joints, the concave joints and composite continuous pipe bodies are connected integrally. The manufacturing process of the convex joints and the concave joints is carried out synchronously and continuously together with the production process of the composite continuous pipe bodies. The concave joint at one end of one composite continuous pipe is connected to the convex joint at one end of another composite continuous pipe through a bolt; two seal rings are mounted between the concave joint and the convex joint; after the two composite continuous pipes are connected, the parts, in contactwith inner conveying media, of the two composite continuous pipes are liner layers; the liner layers are anti-corrosive thermoplastic plastics, so that anti-corrosive performance of pipelines is not reduced for the connecting joint, and the pipe diameters of the pipelines are consistent; the problem that the pipe diameter of a mechanical buckling metal joint is reduced is avoided, and the conveying efficiency is not affected. The inner parts of the pipelines connected by means of the method are anti-corrosive thermoplastic plastics, and are easily connected on site and are mounted quickly.

Description

technical field [0001] The invention belongs to the field of non-metallic composite pipes, and in particular relates to a connection joint and a method for fiber-reinforced thermoplastic composite continuous pipes. Background technique [0002] Non-metallic pipelines have excellent corrosion resistance, and have become an important development direction for anti-corrosion pipelines in oil and gas fields. Non-metallic pipelines for oil and gas fields have developed from the initial glass steel pipes to now include coilable fiber-reinforced thermoplastic composite continuous pipes, steel skeleton composite pipes, flexible composite pipes, plastic alloy composite pipes and other types of non-metallic composite pipes. Non-metallic composite coiled tubing generally adopts a three-layer structure of inner lining layer, reinforcement layer and outer protective layer. Existing non-metallic composite continuous pipes are mainly connected by mechanical crimping metal joints, that is,...

AI Technical Summary

Problems solved by technology

It is found through tests that the joint and its connection method proposed by the invention are only suitable for lower working pressures, because there is no structure similar to the reinforced layer of the composite pipe body at the joint, and it is only made of uniform plastic material, and the pressure bearing performance of the joint is much lower than that of Pressure-bearing performance of composite pipe body

Images