3PE anti-corrosion spiral steel pipes have a complete production technology internationally, and their service life has garnered attention. The three-layer polyethylene anti-corrosion coating (3PE), combining the properties of fused epoxy powder coating and extruded polyethylene, enhances the interface characteristics and chemical resistance of the fused epoxy powder coating. This, coupled with the mechanical protective properties of the extruded polyethylene anti-corrosion coating, significantly boosts the performance of each component.
3PE coated spiral steel pipes are suitable for conveying corrosive mediums in industries such as high-rise building water supply, heating network, potable water projects, natural gas transmission, buried water conveyance pipelines, oil transmission pipelines, petrochemical, dyeing and printing, and more. 3PE coated spiral steel pipes refer to anti-corrosion steel pipes coated with a three-layer polyolefin layer (MAPEC) outside. The production process involves heating the bare pipe using medium-frequency heating, followed by rust removal and inspection, then reheating. This effectively prevents the corrosion of the pipeline due to acids, bases, and salts in chemical fluid mediums. In the past, chemical pipelines were not resistant to corrosion and needed to be replaced annually, leading to high maintenance costs later on.
3PE coated spiral steel pipes are pipes (steel pipes) used in various work environments. One common method of anti-corrosion for these pipes is to apply a uniform and dense coating on the surface of the rust-removed and anti-corrosion coated pipes, isolating them from various corrosive media. 3PE coated steel pipes are used in various work environments. 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 surface of the pipes to achieve anti-corrosion.
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) 170-250um
Three-layer Polyethylene (PE) 1.8～3.7mm
In practice, the three materials are blended and integrated into one, processed to form a durable anticorrosive layer that firmly bonds with steel pipes. The processing methods generally include winding and round mold wrapping.
1. The 3PE anti-corrosion steel pipe coating, also known as three-layer polyethylene 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) coating in North America. It has been recognized and used globally for over a decade.
2. The coating of 3PE anti-corrosion steel pipes consists of an epoxy powder anti-corrosion coating in contact with the steel pipe surface, a middle layer of a copolymer adhesive with branching structural groups, and a surface layer of high-density polyethylene anti-corrosion coating. This 3PE anti-corrosion coating combines the high impermeability and mechanical properties of both epoxy resin and polyethylene materials. To date, it is globally recognized for its excellent performance and effectiveness as a pipeline anti-corrosion coating, making it widely used in various engineering projects.
