Tensile RTP and manufacturing method thereof

Abstract

The invention relates to a tensile RTP and a manufacturing method of the tensile RTP. The pipe comprises an inner pipe and a reinforcing layer wound on the inner pipe, the reinforcing layer is wrapped by a protective layer, the reinforcing layer is composed of two winding straps which are wound on the outer wall of the inner pipe in the opposite directions of turning at preset winding angles, a tensile layer is arranged between the reinforcing layer and the protective layer, and the tensile layer is composed of a set of fiber ropes which are evenly distributed in the circumferential direction and are pre-tensioned in the axial direction. Raw materials are placed into an inner pipe extruder to be extruded and cooled for being sized to form the inner pipe, the two high-strength winding straps are wound on the outer wall of the inner pipe in the opposite directions of turning according to the preset winding angles to form the reinforcing layer, the set of fiber ropes are evenly arranged on the outer surface of the reinforcing layer in the direction of the axis of the pipeline after being pre-tensioned to form the tensile layer, raw materials are placed into an outer pipe extruder to be extruded so as to wrap the tensile layer to form the protective layer, and then online continuous production is achieved through coiling. The tensile RTP has the advantages of being high in tensile property and in flexibility, resistant to high temperature and corrosion, safe, reliable and the like, the RTP is formed at one time according to the manufacturing technology, the production period is short, and the production efficiency is high.

Description

technical field [0001] The invention relates to an RTP pipe, in particular to a tensile RTP pipe used for insertion, and also relates to a manufacturing method thereof, which belongs to the technical field of fluid delivery pipelines. Background technique [0002] The existing interspersed RTP pipes (also known as reinforced thermoplastic pipes) mainly insert high-density polyethylene pipes into the old pipes that need to be repaired, use the rigidity and strength of the old pipes as a load-bearing structure, and use high-density polyethylene pipes It has the characteristics of corrosion resistance, wear resistance, and penetration resistance, forming a "pipe-in-pipe" composite structure, so that the repaired pipeline has the comprehensive performance of steel pipe and high-density polyethylene. This method has low cleaning requirements for old pipelines, reduces pigging time and investment, not only has a short construction period and low cost, but also realizes long-dista...

AI Technical Summary

Problems solved by technology

At present, most of the pipelines used in offshore oil and gas pipelines, land interspersed inner pipes, offshore risers and ocean crossover pipelines are RTP pipes. However, the existing RTP pipes can only bear a small amount of instantaneous axial tension, and their tensile capacity is far more If it is less than the use requirements specified above, moreover, when the RTP pipe is subjected to axial tension, the winding balance angle of its reinforcement tape will become smaller, and the pipe will shrink radially, thereby reducing the pressure bearing capacity and service life of the pipe

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