What is 3PE coating pipe
3PE-coated pipes are specialized pipes with steel pipes as the base material, coated with a three-layer composite anti-corrosion coating on the outer wall. The core structure and characteristics are as follows:
1. Coating Structure and Process
Base Layer Epoxy Powder (FBE):
Thickness > 100 μm, applied via electrostatic spraying and melted for curing, providing strong adhesion and a chemical corrosion barrier.
Adhesive Layer (AD):
Thickness: 170–250 μm, connects the base layer to the outer layer, preventing delamination.
Outer Layer Polyethylene (PE):
Thickness: 1.8–3.7 mm (standard grade/reinforced grade), formed by extrusion winding, resisting mechanical damage and soil/water erosion.
2. Core Performance Advantages
Comprehensive Corrosion Resistance:
Three layers work together to block soil, seawater, and chemical corrosion, with a design life exceeding 30 years.
Impact Resistance:
The polyethylene layer absorbs external impacts (such as gravel collisions) to protect pipeline integrity.
Environmental Adaptability:
Suitable for temperatures ranging from -40°C to 80°C; the reinforced grade can be used in harsh environments such as underwater and mountainous areas.
3. Main Application Areas
Energy Transportation:
Oil and natural gas long-distance pipelines (especially subsea and rock-filled areas).
Municipal Pipelines:
Urban gas and water supply pipelines (reinforced grade with a corrosion-resistant layer thickness of 2.7–2.9 mm).
Industrial Applications:
Chemical medium transportation, power plant return water pipes, and underground mine sprinkler systems.
