Steel Pipe Coating Line with 2lpe and 3lpe Technology
The external 3PE anti-corrosion system consists of a three-layer structure: an epoxy powder base for corrosion resistance, a copolymer adhesive for interlayer adhesion, and an outer polyethylene layer for mechanical protection. The inner wall is coated with liquid epoxy to prevent corrosion from transported media. This comprehensive protection enhances service life and is widely used in oil, gas, and water pipeline engineering. 
The external 3PE (Three-layer Polyethylene) anti-corrosion system consists of a three-layer composite structure: a fusion-bonded epoxy (FBE) powder primer provides fundamental corrosion resistance, an intermediate copolymer adhesive layer ensures high interlayer bonding strength, and an outer polyethylene (PE) layer provides excellent mechanical protection. The inner wall is coated with liquid epoxy, forming a dense barrier that prevents corrosion erosion from transported media (oil, gas, water). This combined inner-and-outer protection scheme offers synergistic, durable, and long-lasting performance, significantly extending the service life of steel pipes, and is widely applied in pipeline projects such as oil/gas transportation and municipal water supply and drainage.
Main Equipment List and specification
| No. | Name | Specification |
| A. Surface Cleaning Equipment | ||
| 1 | Steel pipe conveyor | Adjustable speed and angle, pipe uploading and unloading controlled by PLC |
| 2 | Shot blasting machine | |
| 3 | Cyclone dust collector | High efficient downwind cyclone dust removal |
| 4 | Impulse cartridge dust collector | |
| 5 | Centrifugal fan | |
| 6 | PLC control system | Automatic control of the line |
| B. Coating Equipment | ||
| 1 | Spiral pipe conveyor | Adjustable speed and angle |
| 2 | Induction heating machine | |
| 3 | Powder spraying device | Spraying thickness 80-800μm |
| 4 | Automatic feeder&dryer | |
| 5 | SJ-65/30 Extruder | |
| 6 | SJ-180/30 Extruder | |
| 7 | Adhesive extruder die mould | High quality die steel |
| 8 | PE sheet extruder die mold | High quality die stee |
| 9 | Adhesive/PE sheet coating device | Pressing roller with silicon coating and internal cooling |
| 10 | Environmental Protection Ventilation equipment | |
| 11 | Cooling Spray equipment | |
| C.Platform Equipment | ||
| 1 | Steel pipe platform | High quality |
| D.Groove Equipment | ||
| 1 | PE Beveling Machine | Steel brush disk, |
| 2 | Hydraulic Lifting and Turning Machinery | For lifting and turning the pipe |
| 3 | Hydraulic Equipment | |
√ High sealing, energy-saving, environmentally friendly and consumption-reducing
√ It is easy to operate and has a lifespan of 30 to 50 years
√Low-temperature impact resistance makes the equipment safer
√Internal and external anti-corrosion, simple process and excellent effect
√Fully automatic processing, high-precision production
The anti-corrosion coating processing line includes:
-steel pipe transmission system
-Internal and external shot blasting system
-dust collection system
-pipe heating system
-electrostatic spraying system
-PE coating system
-water cooling system
-end cutting system
-hydraulic and pneumatic system
-testing system
-electronic control system
Upload pipes→pipes screw conveyor→inernal rust removal →external rust removal→ intermediate frequency heating→Internal Epoxy powder coating→External Epoxy powder coating→ outer layer adhesive polyethylene coating→cooling spray→pipes screw conveyor→grinding pipe ends→dowload pipes
1. Pipe diameter: 159-4200mm
2. Processing capacity: ≥250m2/h
3. Cleaning level: ≥Sa2.5
4. Materials for production: epoxy powder, adhesive, polyethylene
Qingdao Huashida Machinery Co., LTD., founded in 2003, is a global developer, manufacturer and solution provider of plastic extrusion equipment. 70% of its customers come from overseas countries such as Europe, America, the Middle East and Southeast Asia.
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