The 3LPE (Three-Layer Polyethylene) system is a multi-layered coating designed to provide industry-leading corrosion resistance and mechanical durability for buried steel pipelines.
First Layer (Inner): Fusion-Bonded Epoxy (FBE). Provides a strong chemical bond to the steel and serves as the primary defense against corrosion.
Second Layer (Middle): Copolymer Adhesive. Acts as the "glue" that chemically bonds the epoxy layer to the outer polyethylene.
Third Layer (Outer): High-Density Polyethylene (HDPE). Provides rugged mechanical protection against impact, moisture, and environmental stress.
Extended Service Life: Designed to last 30–50 years, even in harsh environments.
Superior Durability: High resistance to low-temperature impacts and mechanical damage.
Exceptional Adhesion: Combines the high strength of epoxy with the low water absorption of PE.
Efficiency: Minimizes energy loss and maintenance costs due to its excellent sealing performance.
| Parameter | Range/Requirement |
| Pipe Diameter Range | 50 – 4200 mm |
| Production Capacity | ≥ 250 m²/h |
| Surface Cleaning Level | ≥ Sa 2.5 (High-level grit blasting) |
| Primary Materials | Epoxy powder, Copolymer adhesive, Polyethylene |
The 3LPE coating line is essential for infrastructure projects, including:
Energy: Long-distance oil and gas transportation and urban gas networks.
Utilities: Municipal water supply systems.
Industrial: Specialized fluid pipelines for chemical and manufacturing sectors.
The manufacturing process is divided into four critical stages:
Essential for preparing the steel surface to ensure maximum adhesion.
Pipe wheel conveyors and Shot Blasting Machines.
Environmental controls (Cyclone & Pulse dust collectors).
The core of the application process.
Induction heating devices for pipe preparation.
Powder spraying for the FBE layer.
SJ-Series Extruders and molds for the adhesive and PE sheet application.
Loading, downloading, and storage platforms.
Cooling Spray equipment to set the coating.
PE Beveling Machines for pipe-end finishing.
Integrated PLC automatic control systems for the entire line.
With 23 years of experience, Qingdao Huashida Machinery is a global leader in plastic pipe and anti-corrosion technology. We have served over 400 overseas customers across regions like Central Asia, the Middle East, and Africa.
Our main products are:
1. HDPE jacket pipe for pre-insulated pipe Production Line (110-2000mm)
2. Rigid pre-insulated pipe Production Line
3. Flexible pre-insulated pipe(PERT) production line
4. Steel pipe FBE/2LPE/3LPE anti-corrosion coating line
5. Steel pipe derusting line
6. PE pressure pipe/Water Gas supply pipe production line
6. PP/PE plastic board/sheet/geomembrane production line
7. NBR PVC Thermal insulation tube/plate production line
8.Pipeline anti-corrosion materials and instruments: heat shrink joint coating sleeve, electro-fusion weldable joint sleeve, portable welding gun(extruder), PE PP welding rod.
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