3-Layer Polyethylene (3LPE) Anti-Corrosion Steel Pipe Coating Line

Product Overview

The 3-Layer Polyethylene (3LPE) Anti-Corrosion Steel Pipe Coating Line is designed to provide superior protection for steel pipelines used in oil, gas, water, and industrial fluid transportation. The 3LPE anti-corrosion steel pipe features three specialized layers:

• First Layer – Epoxy Powder Coating: Applied directly onto the steel surface to provide excellent adhesion and outstanding corrosion resistance.
• Second Layer – Copolymer Adhesive: A bonding layer with branched functional groups ensuring strong integration between the epoxy and polyethylene layers.
• Third Layer – High-Density Polyethylene (HDPE): The outer protective layer offers high mechanical strength, low water absorption, and long-term durability.

These layers form a highly effective anti-corrosion system, widely recognized for ensuring pipeline safety and longevity.

Key Advantages

• Excellent Sealing Performance: Minimizes leakage and energy loss during long-term operation.
• Strong Corrosion Resistance: Resists chemical and environmental damage even under harsh conditions.
• Long Service Life: Expected life span of 30–50 years, reducing maintenance and replacement costs.
• Low-Temperature Performance: Maintains structural integrity and protection under cold conditions.
• Low Water Absorption: HDPE layer prevents moisture penetration, enhancing durability.
• High Mechanical Strength & Impact Resistance: Protects pipelines from external forces during installation and operation.
• Cost-Effective Production: Combines reliable performance with an efficient and economical production process.

Technical Parameters

Our Advantages

• Advanced Technology: Designed based on global best practices and continuously improved.
• Stable Operation: Reliable performance with minimal downtime.
• High Degree of Automation: Reduces labor costs and increases efficiency.
• International Quality Standards: Meets ISO and other global certifications.
• Full Turnkey Solutions: From design, installation, and commissioning to operator training.
• Global Experience: Successfully deployed in 389 installations worldwide.
• Professional Technical Team: 9 senior engineers with access to a high-end plastic machinery equipment expert workstation in China.

Technological Process Flow

1. Upload Pipes
2. Pipe Screw Conveyor Transport
3. Rust Removal (Surface Preparation)
4. Intermediate Frequency Heating
5. Epoxy Powder Coating Application
6. Adhesive and HDPE Outer Layer Coating
7. Cooling Spray
8. Pipe End Grinding
9. Final Inspection & Unloading

Main Equipment List

A. Derusting Equipment

• Pipe Wheel Conveyor
• Shot Blasting Machine
• Cyclone Dust Collector
• Pulse Dust Collector
• Centrifugal Exhaust Fan
• Rust Removal Equipment PLC

B. Coating Equipment

• Pipe Wheel Conveyor
• Induction Heating Device
• Powder Spraying Device
• Automatic Loading Dryer
• SJ-65/30 Extruder
• SJ-120/30 Extruder
• Hot Melt Adhesive Extruder Die
• PE Sheet Extruder Head Mold
• Hot Melt Adhesive / PE Sheet Coating Device
• Environmental Protection Ventilation Equipment
• Cooling Spray Equipment

C. Platform Equipment

• Steel Pipe Uploading Platform
• Downloading Platform
• Pipe Storage Platform
• Turnover Mechanism

D. Groove Equipment

• PE Beveling Machine
• Hydraulic Lifting and Turning Machinery
• Hydraulic Equipment
• PLC Automatic Control System

Applications

3LPE-coated steel pipes are widely used in critical infrastructure projects, including:

• Oil & Gas Transportation Pipelines
• Urban Gas Distribution Systems
• Municipal Water Supply Networks
• Industrial Fluid Transmission Systems

Company Profile

Qingdao Huashida Machinery Co., LTD is a leading manufacturer of plastic pipe machines, municipal pipe machines, pipe insulation & anti-corrosion machines, and pipe jointing & anti-corrosion materials, with over 21 years of production experience.

Main Products Include:

1. HDPE jacket pipe production lines for pre-insulated pipes (110-2000mm)
2. Rigid pre-insulated pipe production lines
3. Flexible pre-insulated pipe (PERT) production lines
4. Steel pipe FBE/2LPE/3LPE anti-corrosion coating lines
5. Steel pipe derusting lines
6. PE pressure pipe / water & gas supply pipe production lines
7. PP/PE plastic board, sheet, geomembrane production lines
8. NBR/PVC thermal insulation tube/plate production lines
9. Pipeline anti-corrosion materials & instruments: heat shrink joint coating sleeve, electro-fusion weldable joint sleeve, portable welding gun (extruder), PE/PP welding rod