Industrial 3PE Coating Line for Steel Elbow Pipes with 4-6 Times D Bend Radius
Product Overview
The Huashida Steel Elbow 3PE Coating Line is engineered for the external anti-corrosion coating of steel elbows, hot bends, and other curved steel pipe sections.
Designed for demanding pipeline applications, this line is widely used in industries such as:
- Oil & gas transmission
- Water pipeline systems
- Sewage and wastewater infrastructure
- Chemical process piping
It combines all major coating stages into one integrated production system, including:
- Pipe conveying and rotation
- Surface preparation / shot blasting
- Intermediate frequency heating
- FBE powder application
- Adhesive and PE wrapping
- Cooling and process control
The line is built to deliver a consistent 3-layer PE anti-corrosion coating system (3PE):
- Fusion Bonded Epoxy (FBE)
- Adhesive Layer
- Polyethylene Outer Layer (PE)
The result is a durable coating structure with strong adhesion, excellent corrosion resistance, and reliable long-term protection for harsh operating environments.
How It Works
The production line is configured with 16 or more elbow pipe support and conveying stations, allowing curved pipe sections to move steadily through each stage of the process.
Each elbow is supported and rotated around its center by a dedicated drive mechanism. The system uses a motor-driven gear ring transmission to ensure smooth and controlled rotation during blasting, heating, powder coating, and wrapping.
To accommodate different pipe sizes, the support roller height can be adjusted through the lifting mechanism, maintaining a stable and consistent centerline throughout production.
This design helps ensure:
- Smooth pipe handling
- Stable rotation during coating
- Better coating uniformity
- Higher process efficiency
The full anti-corrosion structure consists of:
FBE Powder + Adhesive + PE Tape
Technical Specifications
| Item | Parameter | Specification |
|---|---|---|
| 1 | Pipe Diameter | 426 / 630 / 720 / 820 / 1000 / 1200 mm |
| 2 | Bend Radius | 4–6D |
| 3 | Elbow Angle | 15°–90° |
| 4 | Pipe Wall Thickness | 8–12 mm |
| 5 | FBE Coating Thickness | ≥170 μm |
| 6 | Adhesive Layer Thickness | 170–250 μm |
| 7 | PE Layer Thickness | 2.5–3.7 mm |
Main System Components
1. Elbow Pipe Conveyor System
The conveyor system is specially designed for the controlled handling and rotation of curved steel pipes.
Key Features
- Independent center-drive rotation
- Gear ring transmission
- Variable frequency speed control
- Heavy-duty protective support wheels
- Slide rail design for easier installation and adjustment
- Fixed-angle self-locking transmission structure
- Height-adjustable support system
This ensures stable pipe positioning throughout the entire coating process.
2. Intermediate Frequency Heating System
The heating system brings the steel surface to the required process temperature before coating.
Key Features
- Adjustable heating angle
- Front and rear electric positioning
- Height adjustment integrated with conveyor line
- Narrow heating profile to reduce uneven heating at bend sections
- 350 kW intermediate frequency power
- Dual closed-loop voltage and current control
This system helps achieve stable heating performance and improved coating quality.
3. FBE Powder Coating System
The powder coating unit is designed for precise application of Fusion Bonded Epoxy (FBE) onto curved steel pipe surfaces.
Key Features
- Circular powder spray chamber
- Electrically adjustable spray chamber position
- Automatic left-right spray gun movement
- CNC-controlled powder output
- 12 spray guns
- U-shaped bottom recovery structure
- Main chamber made of 304 stainless steel
- Rigid negative-pressure recovery ducting
This setup supports uniform coating thickness and efficient powder application.
4. Powder Recovery System
The recovery system is designed to maximize powder utilization and maintain a cleaner production environment.
Key Features
- Powder feeding and recovery system
- Ducting adaptable to different pipe diameters
- Cyclone separator + cartridge filter dust collection
- Pulse back-blow cleaning system
- U-shaped powder collection structure
- 304 stainless steel fluidization hopper
- Vibrating screen powder filter
- 12 venturi powder pumps
This helps reduce powder loss and improve operational efficiency.
5. PE Wrapping System
The wrapping unit applies the outer PE protective layer after powder coating and adhesive application.
Key Features
- Automatic strip locking
- Continuous tape wrapping
- Tight and consistent PE layer application
- High level of automation
- Computer-calculated strip consumption
- Wrapping performance is not affected by minor pipe center deviation
The system is designed to produce a compact and uniform outer layer on curved pipe surfaces.
6. PLC Control System
The entire line is managed by an integrated PLC control platform, enabling automated operation and process monitoring.
Key Features
- Process data collection
- Parameter setting and editing
- Memory function
- Automatic strip consumption calculation
- Real-time speed monitoring and correction
This improves repeatability, reduces operator dependency, and supports more stable production.
Why Choose Huashida
Proven Industrial Design
Built for real-world pipe coating applications with a focus on process stability, automation, and coating consistency.
Designed for Curved Pipe Geometry
Unlike straight-pipe-only systems, this line is specifically developed for elbows and bend sections, where coating control is more demanding.
Efficient, Automated Operation
The integrated system reduces manual handling, improves production flow, and supports more consistent coating quality.
Reliable Export Experience
Huashida equipment has been supplied to customers across:
- Saudi Arabia
- Kazakhstan
- Uzbekistan
- UAE
- Turkey
- Russia
- Other international markets
Recognized Technical Strength
Huashida has been awarded as the First (Set) Technical Equipment in Shandong Province, reflecting strong engineering and manufacturing capability.
About Huashida
Founded in 2003, Qingdao Huashida Machinery Co., Ltd. specializes in the development and manufacturing of:
- 3PE anti-corrosion pipe coating lines
- PU insulation pipe production lines
- Large-diameter underground pipe equipment
- Pipe joint and related machinery
Over the past 20+ years, Huashida has focused on continuous technical development and close collaboration with universities and research institutions, including:
- Beijing University of Chemical Technology
- Qingdao University of Technology
With long-term industry experience and ongoing innovation, Huashida is now recognized as one of the leading manufacturers in this sector in China.
Applications
This line is suitable for coating steel elbows and curved pipe sections used in:
- Oil & gas pipelines
- Municipal water systems
- Wastewater and drainage projects
- Chemical transport pipelines
- Industrial infrastructure projects
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.