3LPE coating (three-layer polyethylene anti-corrosion coating) is a high-performance coating system widely used in pipeline anti-corrosion, mainly used to protect buried or underwater steel pipelines from corrosion.
The structure of 3LPE coating
the structure of 3LPE coating
The 3LPE coating consists of the following three layers of material:
Base layer
Base layer: Fused bonded epoxy resin (FBE)
Thickness: ≥120μm.
Function: Provide excellent anti-corrosion properties, and form a strong chemical bond with the surface of the steel pipe.
Features: High adhesion and resistance to cathode stripping.
Intermediate layer
Intermediate layer: Copolymer Adhesive (AD)
Thickness: 170~250μm.
Function: As a binder between the bottom FBE and the outer polyethylene, to ensure that the three layers of material are tightly bonded.
Features: Good chemical stability and temperature resistance.
Outer layer
Outer layer: High density polyethylene (HDPE)
Thickness: 1.8~3.7mm.
Function: Provides mechanical protection against external physical damage, while having excellent resistance to water penetration and chemical corrosion.
Features: High mechanical strength, wear resistance and stress cracking resistance.
The characteristics of 3LPE coating
3LPE coating combines the advantages of epoxy resin and polyethylene to effectively prevent soil, water and chemical corrosion of steel pipes.
With high impermeability, it can prevent water and oxygen penetration.
The outer polyethylene provides high-strength mechanical protection and can withstand physical shocks during transportation and installation.
The coating has good abrasion resistance and scratch resistance.
The 3LPE coating is suitable for the temperature range from -20 ° C to 80 ° C, maintaining good performance in both high and low temperature environments.
The coating is chemically bonded and mechanically chimed with the surface of the steel pipe to form a solid anti-corrosion layer.
High peeling strength, even in high or low temperature environment can maintain good adhesion.
3LPE coating material is solvent-free and environmentally friendly.
Application of 3LPE coating
Oil and gas pipeline
3LPE coating is the preferred anti-corrosion technology for long distance oil and gas pipelines, and is widely used in long distance oil and gas transportation.
Suitable for a variety of complex environmental conditions, such as gravel soils, high humidity areas and areas with developed plant roots.
Water piping
3LPE coating is also used in drinking water and industrial water transmission pipes to ensure that the water quality is not contaminated.
Chemical pipeline
Due to its excellent chemical resistance, 3LPE coatings are suitable for piping systems in the chemical industry.
