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:

1. Oil & gas transmission
2. Water pipeline systems
3. Sewage and wastewater infrastructure
4. Chemical process piping

It combines all major coating stages into one integrated production system, including:

1. Pipe conveying and rotation
2. Surface preparation / shot blasting
3. Intermediate frequency heating
4. FBE powder application
5. Adhesive and PE wrapping
6. Cooling and process control

The line is built to deliver a consistent 3-layer PE anti-corrosion coating system (3PE):

1. Fusion Bonded Epoxy (FBE)
2. Adhesive Layer
3. 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:

1. Smooth pipe handling
2. Stable rotation during coating
3. Better coating uniformity
4. Higher process efficiency

The full anti-corrosion structure consists of:

FBE Powder + Adhesive + PE Tape

Technical Specifications

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

1. Independent center-drive rotation
2. Gear ring transmission
3. Variable frequency speed control
4. Heavy-duty protective support wheels
5. Slide rail design for easier installation and adjustment
6. Fixed-angle self-locking transmission structure
7. 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

1. Adjustable heating angle
2. Front and rear electric positioning
3. Height adjustment integrated with conveyor line
4. Narrow heating profile to reduce uneven heating at bend sections
5. 350 kW intermediate frequency power
6. 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

1. Circular powder spray chamber
2. Electrically adjustable spray chamber position
3. Automatic left-right spray gun movement
4. CNC-controlled powder output
5. 12 spray guns
6. U-shaped bottom recovery structure
7. Main chamber made of 304 stainless steel
8. 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

1. Powder feeding and recovery system
2. Ducting adaptable to different pipe diameters
3. Cyclone separator + cartridge filter dust collection
4. Pulse back-blow cleaning system
5. U-shaped powder collection structure
6. 304 stainless steel fluidization hopper
7. Vibrating screen powder filter
8. 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

1. Automatic strip locking
2. Continuous tape wrapping
3. Tight and consistent PE layer application
4. High level of automation
5. Computer-calculated strip consumption
6. 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

1. Process data collection
2. Parameter setting and editing
3. Memory function
4. Automatic strip consumption calculation
5. 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:

1. Saudi Arabia
2. Kazakhstan
3. Uzbekistan
4. UAE
5. Turkey
6. Russia
7. 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:

1. 3PE anti-corrosion pipe coating lines
2. PU insulation pipe production lines
3. Large-diameter underground pipe equipment
4. 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:

1. Beijing University of Chemical Technology
2. 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:

1. Oil & gas pipelines
2. Municipal water systems
3. Wastewater and drainage projects
4. Chemical transport pipelines
5. Industrial infrastructure projects