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A connection method between steel pipeline lining anticorrosion construction sections

A connection method and technology of construction section, applied in the direction of pipeline anti-corrosion/anti-rust protection, flange connection, pipe/pipe joint/pipe fitting, etc., which can solve the problems of poor sealing of molten material, hidden quality problems, and prolonged construction period. , to achieve the effect of good sealing performance, long service life and high connection strength

Active Publication Date: 2019-03-29
马付林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, for the connection method of plastic-lined anti-corrosion steel pipelines, the connection of the liner is usually electrofusion connection. The outer diameter of the liner and the inner diameter of the electrofusion sleeve are non-standard sizes, and the wall thickness of the liner is very thin. In some cases, the melting material of the electrofusion sleeve cannot seal the two butt liner ends very well.
When using an electrofusion sleeve to connect two plastic liner ends, a section of the liner is exposed outside the steel pipeline, and the thin-walled liner cannot withstand pressure alone, so that the success of the electrofusion connection cannot be determined in time. It is verified by pressure test, which causes quality problems and prolongs the construction period

Method used

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  • A connection method between steel pipeline lining anticorrosion construction sections

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Comparison scheme
Effect test

Embodiment 1

[0024] see figure 1 , a connection method between steel pipeline lining anticorrosion construction sections, the specific steps are as follows:

[0025] 1. Detect the diameter size of steel pipe 1, high-density polyethylene plastic liner 2 and the recovery of the diameter of plastic liner 2.

[0026] 2. According to the recovery of the diameter of the high-density polyethylene plastic liner 2, the polyethylene plastic flange 4 is molded and manufactured: the redundant polyethylene plastic liner 2 is cut according to a predetermined length, and the reserved polyethylene plastic liner 2 is heated. Mold extrusion is applied inside and outside the liner, and the polyethylene plastic flange 4 is formed on site by natural cooling. The produced polyethylene plastic flange 4 is closely attached to the steel flange 3 connecting the pipe fittings, and the polyethylene plastic flange surface is flat. Smooth and even in thickness.

[0027] 3. After the high-density polyethylene plastic ...

Embodiment 2

[0031] see figure 1 , a connection method between steel pipeline lining anticorrosion construction sections, the specific steps are as follows:

[0032] 1. Detect the diameter size of steel pipe 1, polyolefin high temperature resistant plastic liner 2 and the recovery of the diameter of polyolefin high temperature resistant plastic liner 2.

[0033] 2. According to the recovery of the diameter of the polyolefin plastic liner 2, the polyolefin plastic flange 4 is molded and manufactured: the redundant polyolefin plastic liner 2 is cut according to a predetermined length, and the end of the reserved polyolefin plastic liner is heated. Mold extrusion is applied inside and outside the pipe, and natural cooling completes the on-site molding of polyolefin plastic flange 4. The manufactured polyolefin plastic flange 4 is closely attached to the steel flange 3 connecting the pipe fittings, and the surface of the polyolefin plastic flange is smooth , uniform thickness.

[0034] 3. Af...

Embodiment 3

[0038] see figure 1 , a connection method between steel pipeline lining anticorrosion construction sections, the specific steps are as follows:

[0039] 1. Detect the diameter size of steel pipe 1, ultra-high molecular polyethylene plastic liner 2 and the recovery of the diameter of ultra-high molecular polyethylene plastic liner 2.

[0040] 2. According to the restoration of the diameter of the ultra-high molecular polyethylene plastic liner 2, the ultra-high molecular polyethylene plastic flange 4 is molded and manufactured: the redundant ultra-high molecular polyethylene plastic liner 2 is cut according to the predetermined length, and the reserved ultra-high molecular polyethylene plastic flange 4 is cut according to the predetermined length. The end of the high-molecular polyethylene plastic liner is heated, the inside and outside of the liner are extruded by a mold, and the ultra-high molecular polyethylene plastic flange 4 is formed on site after natural cooling. The prod...

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Abstract

The invention discloses a method for connection between steel pipeline lining anti-corrosion construction sections. The method includes the following steps that firstly, the diameter sizes of steel pipes and plastic lining pipes and the diameter recovery condition of the plastic lining pipes are detected; secondly, forming manufacturing of plastic flanges connected with the plastic lining pipes is conducted according to the diameter recovery condition of the plastic lining pipes; thirdly, after the plastic flanges are formed, a metal gasket is arranged between the two plastic flanges in a cushioned manner, and steel flanges are adopted between the construction sections for correcting and aligning the two plastic flanges; fourthly, a plastic hot melting extruding machine is adopted for extruding plastic melt in for fusion welding and sealing of the two plastic flanges on the butt joint outer circumference end face of the two plastic flanges, and therefore the two plastic lining pipes can be connected into a whole at the position of the plastic flanges through a sealing ring face; and fifthly, a strengthening layer die is manufactured and installed on the periphery of the steel flanges and the plastic flanges, and a strengthening layer is poured in a die cavity. By means of the method, it is ensured that anti-corrosion lining layer connection at the connecting connector position of the two steel pipelines is reliable, the sealing performance is good, the connecting strength is high, the anti-corrosion performance is good, the service life is long, and construction is convenient.

Description

technical field [0001] The invention relates to a connection method of a steel-lined anticorrosion pipeline for transporting fluid, in particular to a connection method between steel pipeline liner anticorrosion construction sections. Background technique [0002] The use of steel pipes to transport fluids is the safest, most convenient and cheapest method of transportation. According to the type, concentration, temperature, flow rate, pressure, etc. of the medium transported by metal pipes, it will have different degrees of damage to the inner wall of the steel pipe. Corrosion, wear and scaling have greatly limited the application of steel pipes. Reasonable selection of anti-corrosion materials and construction technology in the pipeline is an effective method to prolong the service life of the pipeline, reduce investment and prolong the production cycle. As high temperature, high pressure and strong corrosive media are more and more commonly used for steel pipeline transp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L23/024F16L58/02F16L55/18
CPCF16L23/024F16L55/18F16L58/02
Inventor 马付林邱平由刘智军蔡淅坪李文史华平雷炎森马帅
Owner 马付林