What is the characteristic of the 3PE coated pipe?

The 3PE coated pipe is the most advanced technology for pipeline corrosion protection, combining the advantages of both 2PE and FBE (Fusion Bonded Epoxy) coatings while avoiding their limitations. Each layer of the 3PE coating serves a distinct function within the overall protective structure.

Epoxy Layer:

This is the primary anti-corrosion layer, offering strong adhesion to the bare steel pipe surface. It provides excellent resistance to cathodic disbondment, can withstand a wide temperature range (-40°C to 100°C), and has low water absorption properties, ensuring long-lasting protection against corrosion.

Adhesive Layer:

Positioned between the epoxy and polyethylene (PE) layers, the adhesive layer facilitates a strong bond between them. Its main chemical composition is polyolefin, which contains polar functional groups capable of forming hydrogen or chemical bonds with the epoxy group of the FBE layer, ensuring a firm connection. Additionally, the nonpolar ethylene in polyolefin interacts with the PE layer, promoting excellent adhesive properties with the outer layer.

PE Layer:

This outermost layer offers excellent electrical insulation, low water absorption, and high resistance to mechanical damage. Its primary role is to provide mechanical protection and further enhance the pipe’s corrosion resistance.

In summary, the 3PE coating is a composite system made up of three layers, each with a specific function, that together provide comprehensive protection for pipelines. This multi-layer structure ensures the pipeline is well-guarded against corrosion, physical damage, and environmental factors, making it an ideal solution for long-term pipeline integrity.