PLC Controlled Automatic 3LPE Coating Pipe Production Line with Induction Heating for Steel Pipe Anti-Corrosion
Product Description
The 3PE (Three-Layer Polyethylene) anti-corrosion coating line is designed for the external coating of steel pipes used in oil, gas, water supply, district heating, and industrial pipeline systems.
The 3PE coating structure consists of three functional layers:
1. FBE Layer (Fusion Bonded Epoxy)
Provides excellent adhesion to the steel pipe surface and strong corrosion resistance.
2. Adhesive Layer (AD)
Ensures reliable bonding between the epoxy coating and the polyethylene outer layer.
3. Polyethylene Layer (PE)
Provides mechanical protection, low water absorption, and strong environmental resistance.
This multi-layer coating system offers excellent anti-corrosion performance, high mechanical strength, electrical insulation, and long service life, making it an ideal solution for modern pipeline protection.
Technological Process
Pipe Loading → Conveying → Shot Blasting → Induction Heating → FBE Coating → AD & PE Extrusion Coating → Water Cooling → Conveying → Pipe End Grinding → Pipe Unloading
Main Equipment Composition
1. Surface Treatment System
Includes shot blasting machine, cyclone dust collector, pulse dust collector, and exhaust fan for effective rust removal and surface cleaning.
2. Heating System
Equipped with induction heating equipment to ensure stable and uniform pipe surface temperature before coating.
3. Coating System
Includes epoxy powder spraying unit, adhesive extruder, PE extruder, die heads, and coating pressing device for complete 2LPE / 3LPE coating application.
4. Cooling System
Water spray cooling system ensures stable cooling performance and coating quality.
5. Conveying & Handling System
Includes pipe loading platform, conveying system, unloading platform, and turning devices for smooth production flow.
6. Control System
PLC automatic control system for stable, efficient, and intelligent operation.
7. Auxiliary Equipment
Includes PE grooving / beveling machine, hydraulic lifting system, and ventilation equipment.
Our Advantages
1. Excellent Anti-Corrosion Performance
Provides long-term corrosion protection for steel pipes in harsh environments.
2. Long Service Life
The coated pipe system can achieve a service life of 30–50 years.
3. Strong Impact Resistance
Maintains good toughness and impact resistance, even in low-temperature conditions.
4. Energy Saving & Cost Efficient
High sealing performance and efficient production help reduce maintenance and operation costs.
5. Fully Automatic Operation
Advanced PLC control system ensures easy operation, stable performance, and improved production efficiency.
Product Parameters
A. Steel Pipe External Shot Blasting & Derusting Line
| No. | Description | Qty. |
|---|---|---|
| 1 | Transmission line | 1 set |
| 2 | Shot blasting derusting line | 1 set |
| 3 | Cyclone dust collector | 1 set |
| 4 | Pulse filter cartridge dust collector | 1 set |
| 5 | Centrifugal wind blower | 1 set |
| 6 | Derusting equipment electrical control system | 1 set |
B. Steel Pipe External Spiral 3PE Production Line
| No. | Description | Qty. |
|---|---|---|
| 1 | Coating transmission system | 1 set |
| 2 | Intermediate frequency heating system | 1 set |
| 3 | Epoxy spraying system | 1 set |
| 4 | Automatic feeding dryer | 2 sets |
| 5 | SJ-65/30 single screw high-efficiency extruder | 1 set |
| 6 | SJ-120/30 extruder | 1 set |
| 7 | Hot melt adhesive extrusion die head | 1 set |
| 8 | PE sheet extrusion die head | 1 set |
| 9 | Hot melt adhesive / PE sheet pressing device | 1 set |
| 10 | Stainless steel powder spraying chamber | 1 set |
| 11 | Cooling water spray system | 1 set |
C. Platform System
| No. | Description | Qty. |
|---|---|---|
| 1 | Steel pipe upload platform | 1 set |
| 2 | Derusting transition platform | 1 set |
| 3 | Finished pipe storage system | 1 set |
| 4 | Hydraulic system | 3 sets |
D. Grooving System
| No. | Description | Qty. |
|---|---|---|
| 1 | PE grooving device | 2 sets |
| 2 | Hydraulic elevating pipe turner | 2 sets |
| 3 | Operating cabinet | 1 set |
Applications
This production line is widely used for the external anti-corrosion coating of steel pipes in:
1. Oil and gas transmission pipelines
Used for long-distance crude oil and natural gas pipeline projects.
2. Urban gas and water supply systems
Suitable for municipal gas and water transportation pipelines.
3. District heating pipelines
Provides reliable protection for thermal energy and heating pipelines.
4. Underground buried pipelines
Offers strong corrosion resistance for buried steel pipe systems.
5. Industrial anti-corrosion projects
Applicable to chemical, sewage treatment, and industrial fluid transportation pipelines.
Global Application
This coating technology has been widely used in both domestic and overseas pipeline projects.
Our products have been exported to customers in Europe, the Middle East, Central Asia, Africa, Russia, and many other regions.
Company Profile
Qingdao Huashida Machinery Co., Ltd. is a professional manufacturer of plastic pipe machinery, municipal pipe machinery, pipe insulation and anti-corrosion equipment, as well as pipeline anti-corrosion materials, with more than 21 years of production experience.
Our Main Products
1. HDPE jacket pipe production line for pre-insulated pipe (110–2000 mm)
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
7. PP / PE plastic board / sheet / geomembrane production line
8. NBR / PVC thermal insulation tube / plate production line
9. Pipeline anti-corrosion materials and tools, including:
- Heat shrink joint coating sleeves
- Electro-fusion weldable joint sleeves
- Portable welding guns (extruders)
- PE / PP welding rods
We have worked with more than 400 overseas customers and exported our products to Kazakhstan, Uzbekistan, Iran, Turkey, Russia, Nigeria, and many other countries.
Certificates
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.