PLC Controlled 3LPE Coating Pipe Production Line with 50-4200 mm Diameter and Sa 2.5 Surface Cleaning
Product Overview
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.
The 3-Layer Structure
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First Layer (Inner): Fusion-Bonded Epoxy (FBE). Provides a strong chemical bond to the steel and serves as the primary defense against corrosion.
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Second Layer (Middle): Copolymer Adhesive. Acts as the "glue" that chemically bonds the epoxy layer to the outer polyethylene.
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Third Layer (Outer): High-Density Polyethylene (HDPE). Provides rugged mechanical protection against impact, moisture, and environmental stress.
Key Advantages
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Extended Service Life: Designed to last 30–50 years, even in harsh environments.
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Superior Durability: High resistance to low-temperature impacts and mechanical damage.
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Exceptional Adhesion: Combines the high strength of epoxy with the low water absorption of PE.
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Efficiency: Minimizes energy loss and maintenance costs due to its excellent sealing performance.
Technical Specifications
| 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 |
Application Fields
The 3LPE coating line is essential for infrastructure projects, including:
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Energy: Long-distance oil and gas transportation and urban gas networks.
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Utilities: Municipal water supply systems.
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Industrial: Specialized fluid pipelines for chemical and manufacturing sectors.
Production Line: Main Equipment List
The manufacturing process is divided into four critical stages:
A. Derusting Equipment
Essential for preparing the steel surface to ensure maximum adhesion.
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Pipe wheel conveyors and Shot Blasting Machines.
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Environmental controls (Cyclone & Pulse dust collectors).
B. Coating Equipment
The core of the application process.
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Induction heating devices for pipe preparation.
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Powder spraying for the FBE layer.
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SJ-Series Extruders and molds for the adhesive and PE sheet application.
C. Handling & Cooling
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Loading, downloading, and storage platforms.
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Cooling Spray equipment to set the coating.
D. Finishing & Control
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PE Beveling Machines for pipe-end finishing.
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Integrated PLC automatic control systems for the entire line.
About Qingdao Huashida Machinery Co., LTD
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.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.