Pipeline joint coating structure

A pipeline and joint filling technology, which is applied in the field of gas transmission and oil pipeline construction, can solve problems such as debonding and cracking, limited pressure of hot melt adhesives, environmental damage, etc., to achieve improved bonding strength, long-term stable performance, and no environmental pollution Effect

Inactive Publication Date: 2015-04-08
SICHUAN KINGFA TECH DEV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The hot-melt adhesive used in the heat-shrinkable sleeve (tape) has strong polarity and low molecular weight, and has poor compatibility with PE or PP on the surface of the prefabricated anti-corrosion layer at both ends. Large, the pressure applied to the hot melt adhesive is limited, and the hot melt adhesive cannot form a reliable bond with the prefabricated anti-corrosion layers at both ends. After being buried, debonding and cracking are prone to occur, resulting in failure of the joint.
[0005] 2. Radiation cross-linked polyethylene heat-shrinkable tape (sleeve) must be produced through multiple processes such as extrusion molding, radiation cross-linking, diameter expansion, cooling, and glue coating. The cost is extremely high, and it cannot be recycled by thermoplastic. cause some damage

Method used

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Embodiment Construction

[0019] The present invention will be further described below through specific embodiments. The following examples are preferred implementation forms of the present invention, but the implementation manners of the present invention are not limited by the following examples.

[0020] Such as figure 1 As shown, a Ф1219 3LPE pipe joint joint includes butt steel pipe 1 and prefabricated anticorrosion layer 2 at both ends. An epoxy primer layer 3 is provided, and the outer periphery of the epoxy primer layer 3 is covered with a layer of thermoplastic patch 4, the patch 4 is completely covered with the epoxy primer layer 3 and the two ends and the two ends are prefabricated with anti-corrosion layers 2 overlapping.

[0021] The mouth patch 4 is made of maleic anhydride grafted polyethylene copolymer, the grafting rate is 0.25wt%, and the mouth patch 4 has a thickness of 4.2mm.

[0022] The length of the straight part of the joint patch 4 along the axial direction of the pipeli...

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Abstract

The invention discloses a pipeline joint coating structure comprising an abutting steel tube (1) and a two-end prefabricated anti-corrosive coating (2). The two-end prefabricated anti-corrosive coating (2) is circularly applied on the outer wall of the abutting steel tube (1). An epoxy primer layer (3) is arranged on the outer wall of a welding joint reserved in the abutting steel tube (1) and is fully covered with a layer of thermoplastic joint sheet (4). Two ends of the thermoplastic joint sheet (4) are in lap joint with two-end prefabricated anti-corrosive coating (2). According to the arrangement, the joint sheet structure is arranged outside the epoxy primer layer and maintains thermoplasticity, thereby completely fused with a surface layer of the two-end prefabricated anti-corrosive coating and the lap joint of the joint sheet; in this way, sealing effect is good, anti-corrosive structure is stable in long-term performance, and service life is long.

Description

technical field [0001] The invention belongs to the technical field of gas transmission and oil pipeline construction, and in particular relates to a pipeline joint joint structure. Background technique [0002] The steel pipelines used in the construction of oil and gas pipelines must undergo anti-corrosion treatment in advance. 3LPE and 3LPP anti-corrosion layers are commonly used anti-corrosion structures for external anti-corrosion of pipelines. In the process of pipeline anticorrosion, welding joints are often reserved, generally with a width of 100-150mm. The anti-corrosion of the welding joints of steel pipelines is completed on the construction site, and the anti-corrosion technology of the joint joints of the pipelines has a significant impact on the overall anti-corrosion effect of the pipeline, because it is related to the final anti-corrosion quality of the entire pipeline. No matter how good the quality of the 3LPE and 3LPP anti-corrosion coatings in the prefa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L58/00
CPCF16L55/1683F16L58/00
Inventor 胡兵苏俊业陈锬雷小均周浩郑明嘉杨智勇何浏炜杨志骅
Owner SICHUAN KINGFA TECH DEV
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