3PE anti-corrosion spiral steel pipes feature a complete production technology overseas and have garnered attention for their service life. The three-layer polyethylene anti-corrosion coating (3PE), combining the properties of melted epoxy powder coating and extruded polyethylene, enhances the interface characteristics and chemical resistance of the melted epoxy powder coating. This, coupled with the mechanical protective properties of the extruded polyethylene anti-corrosion layer, significantly improves the performance of each.

3PE coated spiral steel pipes are suitable for water supply in high-rise buildings, heating networks, potable water projects, natural gas transmission, buried water transmission pipelines, oil transmission pipelines, chemical, dyeing and printing industries, and other process pipelines for transporting corrosive media. 3PE coated spiral steel pipes refer to anti-corrosion steel pipes with a three-layer polyolefin coating (MAPEC) outside. The production process is as follows: the bare pipe is heated by medium-frequency heating, then checked for rust and heated again. They can effectively prevent the corrosion of the pipeline by acids, alkalis, and salts in chemical fluid media. In the past, chemical pipelines were not resistant to corrosion, requiring replacement annually, with high maintenance costs in the later stage.

3PE coated spiral steel pipes are pipes (steel pipes) used in various work sites. One common method of corrosion protection for steel pipes involves applying a uniform and tight coat to the surface of the de-rusted and corrosion-resistant pipe, isolating it from various corrosive agents. 3PE coated steel pipes are used in different work sites. To slow down or prevent erosion and damage to the pipes due to chemical, electrochemical, or microbiological metabolic activities in external media, two or three layers of polyethylene (3PE) are coated on the outer wall of the pipes to achieve corrosion protection.

3PE Corrosion-Resistant Steel Pipe Coating Structure:

Pipe exterior anti-corrosion method

3PE corrosion protection typically consists of a 3-layer structure:

One layer of epoxy powder (FBE > 100um)

Two-component adhesive (AD) 170-250μm

Three-layer Polyethylene (PE) 1.8～3.7mm

In actual operation, the three materials are blended together to form a cohesive mixture, which is then processed to firmly bond with steel pipes, creating an excellent anti-corrosion coating. The processing methods typically include winding and round mold wrapping.

1. The 3PE anti-corrosion steel pipe coating, also known as triple-layer polyethylene anti-corrosion coating, is a new type of anti-corrosion steel pipe coating that ingeniously combines Europe's 2PE anti-corrosion layer with the widely used FBE (fusion-bonded epoxy) anti-corrosion coating in North America. It has been recognized and used worldwide for over a decade.

2. The 3PE anti-corrosion steel pipe coating consists of an epoxy powder anti-corrosion layer in contact with the pipe surface as the base layer, a copolymer adhesive with branching structural groups as the intermediate layer, and a high-density polyethylene anti-corrosion layer as the surface layer. The 3PE anti-corrosion coating combines the high impermeability and mechanical properties of both epoxy resin and polyethylene materials. To date, it is globally recognized as an effective and high-performance pipe anti-corrosion coating, widely used in numerous engineering projects.