3PE Steel Pipe Anti-Corrosion Coating Line for DN325-2020mm, Medium-Large Diameter Production Equipment

Qingdao Huashida 3PE Steel Pipe Anti-Corrosion Coating Line for DN325-2020mm is a professional anti-corrosion coating system designed for DN325mm - DN2020mm steel pipes. This line features heavy-duty spiral conveyor with individual wheel drive, automatic pipe chasing and disconnecting, electric lifting transfer carts (12-ton capacity each), delivering reliable coating quality for mainline oil & gas transmission, large-scale water transfer projects, petrochemical plant piping. With 280kW PE extruder and 1000kW intermediate frequency heating, this system is optimized for the Russia, UAE, Saudi Arabia, South Africa, large pipeline contractors market. Backed by over 20 years of manufacturing experience since 2003, with 58 invention patents, and 50+ successful installations worldwide, Huashida ensures stable operation, low maintenance cost, and coating quality that meets international standards.

 

1. Wide diameter coverage of DN325mm - DN2020mm in a single production line, reducing equipment investment for mixed-size pipe mills

2. Spiral wrapping coating technology ensures uniform PE layer thickness and excellent adhesion for DN325mm - DN2020mm pipes

3. Compact O-type or side-wrap coating head design minimizes floor space requirement

4. Quick diameter changeover via PLC recipe storage, reducing setup time between production batches

5. 38CrMoAlA nitrided screw with >HV740 hardness delivers 30% higher output at same power consumption

The anti-corrosion coating processing line includes:
-steel pipe transmission system
-Internal and external shot blasting system
-dust collection system
-pipe heating system
-electrostatic spraying system
-PE coating system
-water cooling system
-end cutting system
-hydraulic and pneumatic system
-testing system
-electronic control system

Coating Process: 3PE spiral wrapping coating (FBE + AD adhesive + PE), side-wrap extruder

Standard 3PE Process Sequence:

Pipe Loading -> External Shot Blasting (Sa 2.5) -> Pipe Internal Air Purging
-> Pipe End Masking -> Intermediate Frequency Heating (~200deg C)
-> FBE Epoxy Powder Spraying -> AD Adhesive Extrusion & Wrapping
-> PE Extrusion & Wrapping -> Water Spray Cooling -> Joint Cutting
-> PE End Beveling -> Holiday Detection -> Finished Pipe Unloading

3. Key Configuration

Surface preparation is the foundation of this DN325mm - DN2020mm coating line, featuring external shot blasting machine, 2x37kw blast wheels, 350kg/minx2, sa 2.5 grade that delivers Sa 2.5 cleaning grade per ISO 8501-1 with anchor profile depth of 50-90um. The blasting system incorporates three-stage dust collection (settling chamber -> cyclone separator -> cartridge/bag filter), with Mn13 wear plates for extended service life. Abrasive velocity reaches 70-85 m/s with bottom-throw wheel design, minimizing abrasive consumption through optimized impact angles.

Following blasting, 1000kW intermediate frequency heating, C-type coil, pure water cooling raises pipe temperature to approximately 200deg C using C-type coil with pure water cooling. The FBE powder application uses multi-gun electrostatic spray with (n+1)x2 redundant design, achieving over 95% powder recovery through stainless steel booth with water cooling. Coating extrusion is handled by SJ-65/30 single screw extruder, 45kW, max output 100 kg/h (adhesive layer) and SJ-120/33 single screw extruder, 280kW, max output 750 kg/h (polyethylene layer), both featuring 38CrMoAlA nitrided screws (0.4-0.7mm depth, >HV740 hardness).

Pipe diameter range covers DN325mm - DN2020mm with standard length of 6-15 meters. The control system uses internationally recognized PLC with 10-inch industrial-grade HMI, VFD from internationally recognized brands, and industrial-grade control components. Post-coating processing includes water spray quench cooling (<=20deg C, >=0.3MPa, 26-30 m3/h), rotary peeler knife end beveling (~40 sec/pipe), and high-voltage holiday detection. Staffing requirement is 4-5 operators, with minimum 9-meter workshop height for large diameter configurations.
 

1. Pipe diameter: 325-2020mm
2. Processing capacity: ≥250m²/h
3. Cleaning level: ≥Sa2.5
4. Materials for production: epoxy powder, adhesive, polyethylene

Why Choose Qingdao Huashida

Qingdao Huashida Machinery Co., Ltd. has established a truly global presence in pipeline anti-corrosion equipment. Beyond its 33,000 m2 headquarters in Qingdao, the company operates a production base in Uzbekistan and maintains a strategic partnership with Solution Berg Pipes Company in Saudi Arabia. Equipment has been successfully exported to Russia, the United Arab Emirates, Saudi Arabia, Iran, Uzbekistan, Kazakhstan, Nigeria, South Africa, India, and Thailand, covering major oil and gas producing regions worldwide. This extensive international experience means Huashida understands the unique requirements of different markets - from GOST standards in Russia and CIS countries to international pipeline coating standards in the Middle East and beyond.

Established in 2003, the company holds 58 invention patents, 38 utility model patents, and 38 software copyrights, with core technology from Germany and R&D partnerships with Beijing University of Chemical Technology. With over 100 employees including 12 installation and commissioning specialists, Huashida provides comprehensive on-site support for overseas installations, typically 7-15 days until stable production. For clients in the Russia, UAE, Saudi Arabia, South Africa, large pipeline contractors market, this global footprint means local support, faster spare parts delivery, and equipment proven in similar regional conditions.