Applications of 3PE Polyethylene Anti-Corrosion Insulated Pipes

Release date:

2019-08-29

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Category:

Steel Pipe Knowledge

At present, pipeline anti-corrosion technologies have received widespread acclaim in practical market applications. These technologies are employed across a wide range of industrial sectors, including construction, petroleum, power generation, metallurgy, national defense, transportation and storage, boilers, heat exchangers, fans, and vehicles and ships. Among them, anti-corrosion and thermal‑insulation pipe technology typically involves applying an external anti-corrosion coating to the outer surface of spiral‑wound pipes to mitigate corrosion and extend service life. Currently, the primary external anti-corrosion coatings used for spiral pipes include three‑layer polyethylene (3PE), epoxy powder, and epoxy coal tar pitch; accordingly, products such as epoxy‑powder‑coated thermal‑insulation pipes and epoxy‑coal‑tar‑pitch‑coated steel pipes can be manufactured. The use of three‑layer polyethylene and epoxy powder coatings offers several advantages: excellent waterproofing and corrosion resistance, electrical insulation, and low‑temperature performance. In many European and North American countries, these coatings are the standard choice for underground pipelines. Considering factors such as overall service life and maintenance costs, China currently prioritizes the three‑layer polyethylene composite anti-corrosion coating. The specific manufacturing process for three‑layer polyethylene‑coated spiral anti‑corrosion and thermal‑insulation pipes is as follows: medium‑frequency heating of the spiral pipe, shot blasting for rust removal, quality inspection of the blast‑cleaned surface, medium‑frequency heating, application of epoxy powder, coating with an adhesive, extrusion of polyethylene, water‑cooling treatment, leak testing of the coating, and finally stacking the coated pipes.

Currently, pipeline anti-corrosion technologies have received widespread acclaim in practical market applications. These technologies are employed across a range of industrial sectors, including construction, petroleum, power generation, metallurgy, national defense, transportation and storage, boilers, heat exchangers, fans, and automotive and marine equipment. Among them, anti-corrosion and thermal‑insulation pipe technology typically involves applying an external protective coating to the outer surface of spiral‑wound pipelines to mitigate corrosion and extend service life. At present, the primary external anti-corrosion coatings used for spiral‑wound pipelines include three‑layer polyethylene (3LPE), epoxy powder, and epoxy coal tar pitch. Based on these materials, it is possible to manufacture epoxy‑powder‑coated insulated pipes, epoxy coal tar pitch‑coated steel pipes, and other specialized products.

The three-layer PE polyethylene and epoxy powder coating offers the following advantages: excellent waterproofing and corrosion resistance, electrical insulation, and low-temperature resistance. In Europe and North America, these coatings are the primary choice for underground pipelines. Considering factors such as overall service life and maintenance costs in China, the three-layer PE polyethylene composite coating is currently the preferred option. The specific manufacturing process for spiral‑wound, corrosion‑resistant, insulated pipes using three-layer PE polyethylene is as follows: medium-frequency heating of the spiral pipe, shot blasting for rust removal, quality inspection of the blast‑cleaned surface, medium-frequency heating, application of epoxy powder coating and adhesive, outer wrapping with polyethylene, water‑cooling treatment, leak testing of the coating, and finally stacking the coated pipes.