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On-spot connection joint and method for reinforced thermoplastic plastic pipes

A technology of enhanced thermoplasticity and on-site connection, applied in the direction of pipe/pipe joint/fitting, sleeve/socket connection, through components, etc., which can solve the problems of poor gas tightness of threaded connection, limited connection operation conditions, and insufficient connection reliability, etc. , to achieve the effect of improving connection sealing, improving connection reliability and construction efficiency, and improving corrosion resistance

Inactive Publication Date: 2019-04-09
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are three main problems in this connection: 1. The core tube and the jacket are generally made of carbon steel, and the core tube in contact with the fluid medium is prone to corrosion
2. Insufficient connection reliability may occur at the thread when two pipes are connected, especially when transporting corrosive oil and gas media, the gas tightness of the threaded connection is poor, and the welding is prone to corrosion
3. On-site connection operation conditions are limited, and connection quality problems are prone to occur

Method used

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  • On-spot connection joint and method for reinforced thermoplastic plastic pipes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1--2

[0025] Example 1--2 RTP pipes 3 connections

[0026] 1) Put two outer sleeves made of 20# steel on the outside of the two RTP pipes 3 respectively;

[0027] 2) Two pairs of sealing grooves are formed at both ends of the 316 material connecting pipe with teeth. Place 4 silicone rubber sealing rings in the sealing grooves at both ends of the 316 material connecting pipe respectively, and then evenly coat the parts with teeth. Apply EVA hot melt adhesive;

[0028] 3) Insert the two ends of the connecting pipe into the body of the RTP pipe 3 respectively, then move the outer sleeve to a position flush with the end of the RTP pipe 3, and compress the outer sleeve to the designed diameter with a hydraulic compression device.

[0029] 4) Coating epoxy anti-corrosion paint on the outside of the outer sleeve.

Embodiment 2--1

[0030] Example 2--1 RTP pipe 3 connected to 316 steel pipe

[0031] 1) Put a 20# steel outer sleeve outside the RTP pipe 3;

[0032] 2) One end of the 316 connecting pipe with teeth is processed to form 3 pairs of sealing grooves, and three nitrile rubber sealing rings are respectively placed in the sealing grooves, and then coated with EVA hot melt adhesive on the part with teeth;

[0033] 3) Insert the toothed end of the connecting pipe into the RTP pipe 3, then move the outer sleeve to a position flush with the end of the RTP pipe 3, and compress the outer sleeve to the designed diameter with a hydraulic compression device.

[0034] 4) Weld the other end of the connecting pipe with the 316L steel pipe;

[0035] 5) Coating epoxy coal tar pitch anti-corrosion coating on the outer sleeve.

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Abstract

The invention discloses an on-spot connection joint and method for reinforced thermoplastic plastic pipes. The on-spot connection joint comprises a connection pipe with the two ends being connected inside the RTP pipes in a sleeved manner, the two ends of the connection pipe are provided with ring-shaped teeth and provided with a plurality of seal ring grooves, the parts, connected on the connection pipe in a sleeving manner, of the RTP pipes are provided with outer sleeve tubes in a sleeved manner, and the outer sleeve tubes perform sealing through seal rings arranged inside the seal ring grooves and hot melt glue layers coated on the ring-shaped tooth portions at the two ends of the connection pipe. According to the on-spot connection joint and method for the reinforced thermoplastic plastic pipes, by means of the method that parts in contact with a fluid medium adopt stainless steel, corrosion resistant alloy or bimetallic steel pipes, the corrosion resistant performance of traditional carbon steel coupler joint core pipes is improved; the single connection pipe is adopted as an inner pipe for connecting the two RTP pipes, connection procedures are reduced, the connection process between the pipes is optimized, and the connection reliability and the construction efficiency are improved; and by means of the additions of the seal rings and the hot melt glue layers in the structure, internal small molecular medium escape passages are obstructed, and the connection tightness is improved.

Description

technical field [0001] The invention belongs to the technical field of composite material pipe connection, and relates to an on-site connection joint and method for reinforcing thermoplastic pipes. Background technique [0002] With the increasingly serious corrosion of metal pipelines, it has brought great economic losses and safety hazards to oil fields. Due to the excellent corrosion resistance of non-metallic and composite material pipes, they are gradually replacing metal pipes and are being used more and more widely. There are many types of non-metallic pipes. In recent years, reinforced thermoplastic composite pipes (RTP) have overcome the shortcomings of poor impact resistance of FRP pipes, and are currently a hot spot in the research and application of composite pipes for oil and gas transportation. Most of the RTP adopts a three-layer structure, the inner layer is usually a corrosion-resistant and wear-resistant thermoplastic pipe, the middle layer is a reinforcin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L21/00
CPCF16L21/005
Inventor 戚东涛齐国权李厚补魏斌丁楠蔡雪华邵晓东张冬娜
Owner BC P INC CHINA NAT PETROLEUM CORP
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