50-4200mm 3LPE Coating Pipe Production Line with Induction Heating and Fully Automatic Operation for Steel Pipe Anti-Corrosion

Product Description

The 3PE (Three-Layer Polyethylene) coating represents a leading advancement in corrosion-resistant technology. Its engineered structure integrates a fusion-bonded epoxy (FBE) inner layer for superior adhesion, a tough adhesive (AD) intermediate layer for strong molecular bonding, and a high-durability polyethylene (PE) outer layer that delivers long-term external protection. This multi-layer system provides outstanding mechanical robustness, excellent electrical insulation, and stable, reliable processing performance. Its environmentally conscious composition makes it an ideal solution for protecting oil and gas transmission lines, municipal water pipelines, and modern district heating networks.

Technological Process

The production line follows a precise and efficient workflow:

1. Pipes are loaded and conveyed smoothly along the line.
2. Shot blasting removes rust and prepares the surface for coating adhesion.
3. Medium-frequency induction heating delivers consistent thermal energy to optimize the coating process.
4. The FBE inner layer is applied first, followed by the AD adhesive and PE outer layer extrusion coating.
5. Water cooling ensures proper temperature control, enhancing coating quality.
6. Pipes are then conveyed to pipe end grinding and finally unloaded after inspection.

Main Equipment Composition

The production line includes a full set of advanced machinery:

1. Surface treatment equipment, featuring a robust shot blasting machine with a cyclone dust collector and pulse dust remover, ensuring impeccable surface preparation.
2. Advanced induction heating systems to provide uniform thermal energy for optimal coating performance.
3. Comprehensive coating units, including FBE powder spraying, AD adhesive extrusion, and PE extrusion for seamless, durable application.
4. Effective cooling devices, such as water spray units, to maintain ideal coating temperatures.
5. Efficient conveying systems, including pipe loading/unloading platforms and turning rollers for smooth operation.
6. Intelligent PLC automatic control systems, delivering precise, reliable, and fully automated process management.
7. Auxiliary equipment, including PE beveling machines, hydraulic lifting systems, and comprehensive exhaust and ventilation units for seamless operations.

Our Advantages

This 3LPE coating line offers multiple operational benefits:

1. Cost Reduction: High sealing performance and energy-efficient operation reduce overall costs while remaining environmentally friendly.
2. Long Service Life: Coated pipes last 30–50 years, minimizing maintenance and replacement needs.
3. Excellent Impact Resistance: Maintains structural integrity even at low temperatures, with minimal water absorption for enhanced durability.
4. Superior Anti-Corrosion Performance: Multi-layer design ensures effective protection through a straightforward and cost-efficient process.
5. Fully Automatic Operation: PLC control with intelligent sensors monitors position, speed, and energy levels, ensuring precise and efficient operation.

Applications

The 3-layer PE coated steel pipes from Qingdao Huashida Machinery Co., Ltd. are designed for a wide range of applications:

1. Oil and Gas Transmission Pipelines: Provides long-term protection against corrosion and external damage for safe resource transport.
2. Urban Gas and Water Supply Systems: Ensures safe, clean, and reliable fluid transport in municipal networks.
3. District Heating Networks: Maintains insulation and corrosion resistance under high-temperature conditions.
4. Underground and Industrial Anti-Corrosion Projects: Offers robust protection for both buried and exposed steel pipelines.

This coating technology has been successfully applied in large-scale infrastructure projects worldwide, with exports reaching Europe, the Middle East, Central Asia, Africa, Russia, and beyond.

Company Profile

Qingdao Huashida Machinery Co., LTD has over 20 years of experience manufacturing plastic and municipal pipe machinery, advanced pipe insulation and anti-corrosion equipment, and innovative pipe jointing materials. The company’s main products include:

1. HDPE jacket pipe 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 anti-corrosion coating lines with FBE, 2LPE, and 3LPE technologies
5. Steel pipe derusting lines
6. PE pressure pipe and water & gas supply pipe production lines
7. PP/PE plastic board, sheet, and geomembrane production lines
8. NBR/PVC thermal insulation tube and plate production lines
9. Pipeline anti-corrosion materials and instruments, including heat shrink joint coating sleeves, electro-fusion weldable joint sleeves, portable welding guns (extruders), and PE/PP welding rods