Flexible joint of large-diameter high-pressure fiber reinforced flexible composite pipe

Abstract

The invention relates to a flexible joint of a large-diameter high-pressure fiber reinforced flexible composite pipe, and belongs to the field of fiber reinforced thermoplastic pipelines. According to the technical solution, a reinforcing layer is formed by spirally winding fiber bands, the reinforcing layer is of a structure with at least two layers, and the spiral winding directions of the adjacent layers of the fiber bands are opposite; a filling layer is arranged between the adjacent layers of the reinforcing layers, and the filling layer is made of an elastic material which can be extruded and deformed; the fiber bands exceed the end part of an inner lining layer by a certain distance. According to the flexible joint, the thicker fiber bands are provided, the winding frequency of the fiber bands is reduced, processing of the fiber-reinforced flexible composite pipelines is facilitated, flexible connection of the pipelines is facilitated, the problem of stress concentration of the reinforcing layer caused by a metal joint can be avoided, meanwhile, the problem of insufficient strength of a welding joint is solved, and according to the technical solution, the requirements of oil and gas pipeline transportation and other application occasions can be met.

Description

technical field [0001] The invention relates to a flexible joint of a large-diameter high-pressure fiber-reinforced flexible composite pipe, which belongs to the field of pipeline transportation, in particular to the field of fiber-reinforced thermoplastic pipes. Background technique [0002] Reinforced Thermoplastic Pipes (RTP pipe for short) is a high-pressure plastic composite pipe with good flexibility, corrosion resistance, high pressure resistance, impact resistance, wear resistance, light weight, easy connection, and coilable , long-distance non-joint fast laying, etc., can well overcome the corrosion of steel pipes and the pressure resistance of plastic pipes, and can be used in oil and natural gas mining, high-pressure long-distance natural gas transmission, and various mediums that require higher pressure transmission pipeline field. RTP products are usually composed of three layers, the inner and outer layers are made of PE80, PE100 or above, and the outer layer ...

AI Technical Summary

Problems solved by technology

[0010] Purpose of the present invention: to overcome the problem that the existing fiber reinforced flexible composite pipe joints have low pressure bearing capacity and are not suitable for large-diameter and high-pressure pipes; to solve the problem of discontinuous force transmission of the reinforced layer of the flexible composite pipe joint; to provide a Large fiber tape reduces the number of fiber tape windings, facilitates the processing of fiber-reinforced flexible composite pipes, and facilitates the flexible connection of pipes

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