3PE Pipe Coating Production Line for DN219-1620mm, Medium Diameter Steel Pipe Anti-Corrosion System

Qingdao Huashida 3PE Pipe Coating Production Line for DN219-1620mm is a professional anti-corrosion coating system designed for DN219mm - DN1620mm (max DN1720mm) steel pipes. This line features proven configuration with sj-65/30 ad extruder and sj-120/30 pe extruder, 500kw if heating, 90kw shot blasting, delivering reliable coating quality for long-distance oil & gas transmission pipelines, water supply trunk lines, industrial plant piping. With 280kW PE extruder and 1000kW intermediate frequency heating, this system is optimized for the Russia, Kazakhstan, Nigeria, India, China domestic market 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 DN219mm - DN1620mm (max DN1720mm) 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 DN219mm - DN1620mm (max DN1720mm) 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

This DN219mm - DN1620mm (max DN1720mm) production line features 1000kW intermediate frequency heating, C-type coil, pure water cooling as its thermal core, precisely heating steel pipes to approximately 200deg C for optimal FBE powder curing. The heating system incorporates C-type coils with pure water cooling and low-pressure protection (supply pressure >0.2MPa).

Process intelligence is delivered through internationally recognized PLC with 10-inch industrial-grade HMI, enabling recipe storage for one-click diameter changeover across DN219mm - DN1620mm (max DN1720mm) range. Variable frequency drives from internationally recognized brands ensure precise speed control, with industrial-grade electrical components throughout. Surface preparation uses external shot blasting machine, 2x37kw blast wheels, 350kg/minx2, sa 2.5 grade, achieving Sa 2.5 grade (ISO 8501-1) with 50-90um anchor profile depth.

Coating application employs SJ-65/30 single screw extruder, 45kW, max output 100 kg/h (adhesive) and SJ-120/33 single screw extruder, 280kW, max output 750 kg/h (polyethylene), both equipped with 38CrMoAlA nitrided screws (0.4-0.7mm nitriding depth, >HV740 hardness). The FBE station uses multi-gun electrostatic spray with (n+1)x2 redundancy and >95% powder recovery. Pipe length capability is 6-15 meters (12m standard).

Cooling is achieved through water spray quench (<=20deg C, >=0.3MPa, 26-30 m3/h), with end beveling via rotary peeler knife (~40 sec/pipe). Final quality control includes high-voltage holiday detection and thickness measurement. The line operates with 4-5 personnel and requires minimum 9-meter workshop height for large diameter models.

1. Pipe diameter: 219-1620mm
2. Processing capacity: ≥250m²/h
3. Cleaning level: ≥Sa2.5
4. Materials for production: epoxy powder, adhesive, polyethylene

Why Choose Qingdao Huashida

Qingdao Huashida’s large-diameter capability is industry-leading, with proven projects up to DN6600mm domestically and DN2540mm overseas. This extensive track record in large-diameter pipeline coating demonstrates the company’s ability to handle the most challenging pipeline coating requirements, including the DN219mm - DN1620mm (max DN1720mm) range of this product line.

Established in 2003 and operating from a 33,000 m2 facility in Qingdao, Huashida has accumulated over two decades of experience in pipeline anti-corrosion equipment. The company holds 58 invention patents, 38 utility model patents, and 38 software copyrights, with core technology originating from Germany and R&D partnerships with Beijing University of Chemical Technology. Globally, Huashida operates a production base in Uzbekistan and maintains a strategic partnership with Solution Berg Pipes Company in Saudi Arabia. Equipment has been exported to Russia, UAE, Saudi Arabia, Iran, Uzbekistan, Kazakhstan, Nigeria, South Africa, India, and Thailand, with multiple repeat-order customers demonstrating long-term satisfaction. For large-diameter pipeline projects, this proven capability translates to reliable equipment that has been validated in the most demanding applications worldwide.