Repairing anti-corrosion layer structure of in-service pipeline

Abstract

The invention discloses a joint coating repairing anticorrosion layer structure for an in-service pipeline, and belongs to the field of oil and gas pipeline transportation technologies. The in-service pipeline comprises steel pipes (1), anticorrosion layers (2) and joint coating metal ring seams (3). The steel pipes (1) are buried in the ground, a viscoelastic rubber band (4) is arranged on the outer surface of each joint coating metal ring seam (3), a pressure-sensitive adhesive type thermal contraction band (5) covers the outer periphery of each viscoelastic rubber band (4), each viscoelastic rubber band (4) completely covers the corresponding joint coating metal ring seam (3), two ends of each viscoelastic rubber band (4) are in lap joint with the corresponding anticorrosion layers (2), each pressure-sensitive adhesive type thermal contraction band (5) completely covers the corresponding viscoelastic rubber band (4), and two ends of each pressure-sensitive adhesive type thermal contraction band (5) are in lap joint with the corresponding anticorrosion layers (2). The joint coating repairing anticorrosion layer structure has the advantages that compound structures with the viscoelastic rubber bands and the pressure-sensitive adhesive type thermal contraction bands which are combined with one another are arranged at joint coating positions of the pipeline, so that the joint coating repairing anticorrosion layer structure is excellent in anticorrosion performance and has low surface treatment requirements, and a construction process can be carried out conveniently and quickly.

Description

technical field [0001] The invention relates to the technical field of oil and gas pipeline transportation, in particular to an anticorrosion layer structure for in-service pipeline joint repair. Background technique [0002] Since the end of the 1990s, three-layer polyethylene has gradually become the first choice for the external anti-corrosion layer of long-distance pipelines in China. However, the non-polarity of the polyethylene material itself makes it difficult to find a stable bonding material with it. Due to various factors such as construction and environment, the traditional hot-melt adhesive-type polyethylene heat-shrinkable tape sealing defects are increasingly appearing, and even the protection fails under the action of groundwater and soil stress, and local pipe sections have begun to be repaired. Overhaul of the joint anti-corrosion coating. Compared with newly-built pipelines, in-service pipelines are relatively more difficult to repair the on-site anti-cor...

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Problems solved by technology

[0003] In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: the installation of the hot-melt adhesive type heat shrinkable tape requires the pipe body to have a sufficient preheating temperature, and the pipeline in service due to the flow of the pipeline medium The temperature is difficult to meet the installation requirements by heating; cold-wrapped tape or liquid anti-corrosion materials are used as traditional repair materials for in-service pipelines, and because they have no effective bonding with the polyethylene overlapping parts, mechanical strength or insulation performance with the polyethylene anti-corrosion layer of the pipe body It is not suitable for the repair of the three-layer structure polyethylene anti-corrosion layer.

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