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Connection method of large-diameter high-pressure fiber-reinforced flexible composite pipe

A flexible composite pipe, fiber reinforced technology, applied in the direction of hose connection device, pipe connection arrangement, pipe/pipe joint/pipe fitting, etc. High-pressure pipelines and other problems, to avoid stress concentration, high-strength connection, and convenient connection

Active Publication Date: 2022-02-22
YIBIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Purpose of the present invention: In order to overcome the problem that the existing fiber-reinforced flexible composite pipe joint has low pressure bearing capacity and is not suitable for large-diameter and high-pressure pipes; fundamentally solve the problem of discontinuous force transmission of the reinforced layer of the flexible composite pipe joint

Method used

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  • Connection method of large-diameter high-pressure fiber-reinforced flexible composite pipe
  • Connection method of large-diameter high-pressure fiber-reinforced flexible composite pipe
  • Connection method of large-diameter high-pressure fiber-reinforced flexible composite pipe

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0042] Inner lining layer 1 has a pipe inner diameter of 700mm. Inner lining layer 1 is made of polyethylene pipe with a wall thickness of 26mm. Reinforcement layer 2 is made of aramid fiber. Reinforcement layer 2 contains 10 layers of fibers with a total thickness of 20mm. The angle is 55°, and the winding directions of the fibers are opposite between adjacent layers of the reinforcement layer 2 . The overlapping length of the innermost layer of fibers at the joint is 1300 mm, the overlapping length of the outermost layer of fibers is 900 mm, and the overlapping lengths of the middle layers are evenly transitioned. After the reinforcing layer is wound, a polyethylene tape is wrapped on the outside of the butt joint as a protective layer 3, and the thickness of the protective layer 3 is about 4 mm.

[0043]Through experiments and finite element analysis with the help of the Tsai-Wu criterion, the burst pressure of the pipeline described in Embodiment 1 is close to 34 MPa, the ...

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Abstract

The invention relates to a connection method for large-diameter high-pressure fiber-reinforced flexible composite pipes, and belongs to the field of fiber-reinforced thermoplastic pipes. Its technical solution: welding the inner lining layer, then overlapping and winding the reinforcing layer according to the direction of rotation of each layer, and finally setting a protective layer on the outside of the joint. The invention can avoid the problem of stress concentration of the reinforcing layer caused by the metal joint, and at the same time solve the problem of insufficient strength of the welded joint. The technical scheme of the present invention can effectively and high-strengthly connect large-diameter high-pressure fiber-reinforced flexible composite pipes to meet the needs of oil and gas pipeline transportation and other application occasions.

Description

technical field [0001] The invention relates to a method for connecting large-caliber high-pressure fiber-reinforced flexible composite pipes, 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. [0003] RTP products are usually composed of three layers, the inner and outer layers are made of PE80, PE100 or above, and the o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29D23/00F16L33/34F16L47/02F16L57/00
CPCB29D23/001F16L33/34F16L47/02F16L57/00
Inventor 何虹钢陈怡圯
Owner YIBIN UNIV
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