High Precision 3PE Coating Line, Accurate Coating Thickness Control Steel Pipe Anti-Corrosion Equipment

Qingdao Huashida High Precision 3PE Coating Line is a professional anti-corrosion coating system designed for DN114mm - DN1020mm steel pipes. This line features gravimetric feeding system for precise material control (+/-0.5%), multi-point ir temperature monitoring, closed-loop temperature control, precision die lip adjustment (1-3mm), laser thickness measurement option, strict quality control integration, delivering reliable coating quality for high-spec oil & gas pipelines, critical infrastructure pipelines, major water transfer projects, projects with strict coating tolerance requirements.

With 160kW PE extruder and 500kW intermediate frequency heating, this system is optimized for the Europe, North America, Japan, high-spec projects, critical infrastructure pipelines 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. Gravimetric feeding system achieves +/-0.5% material dosing accuracy for precise coating thickness

2. Multi-point IR temperature monitoring ensures uniform heating across pipe circumference

3. Closed-loop temperature control maintains FBE curing temperature within +/-5deg C tolerance

4. Precision die lip adjustment (1-3mm) enables fine-tuning of PE coating thickness profile

5. Laser thickness measurement option provides real-time coating quality monitoring

The anti-corrosion coating processing line includes:

Coating Process: 3PE coating optimized for oil & gas pipeline specifications

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

Engineered for pipe diameter range of DN114mm - DN1020mm and standard pipe length of 6-15 meters (12m standard), this complete 3PE coating line integrates all process stations from loading through final inspection. Utility requirements include three-phase power supply with transformer sizing at installed power x 1.2 (accounting for auxiliary equipment such as cranes and lighting), cooling water at 26-30 m3/h (<=20deg C, >=0.3MPa), and compressed air at 6 m3/min (>0.5MPa).

The production sequence begins with external shot blasting machine, 90kw, sa 2.5 grade, anchor profile 50-90um (Sa 2.5 grade, 50-90um anchor profile), followed by 500kW intermediate frequency heating, C-type coil, pure water cooling heating to ~200deg C. Coating application uses SJ-65/30 single screw extruder, 37kW, max output 100 kg/h for adhesive and SJ-120/30 high-efficiency single screw extruder, 160kW, max output 600 kg/h for polyethylene, both with 38CrMoAlA nitrided screws (0.4-0.7mm nitriding depth, >HV740 hardness).

The FBE station features multi-gun electrostatic spray with (n+1)x2 redundancy and >95% powder recovery rate. Process control is managed by internationally recognized PLC with 10-inch industrial-grade HMI, supporting recipe storage for one-click diameter changeover. VFD brands include internationally recognized options with industrial-grade electrical control components. Cooling uses water spray quench system, end beveling via rotary peeler knife (~40 sec/pipe with kraft paper masking), and final inspection includes high-voltage holiday detection and thickness measurement.

The line requires 4-5 operators and minimum workshop height of 9 meters for large diameter configurations. Free factory layout design and civil engineering guidance are provided as part of the complete solution.

This coating line is specifically suited for:

• High-spec oil & gas pipelines, critical infrastructure pipelines, major water transfer projects, projects with strict coating tolerance requirements

• Oil & gas transmission and distribution pipelines

• Municipal water supply and sewage pipelines

• Chemical plant process piping

• Mining and slurry transport pipelines

Target Market: Europe, North America, Japan, high-spec projects, critical infrastructure pipelines

Export Countries: Russia, UAE, Saudi Arabia, Iran, Uzbekistan, Kazakhstan, Nigeria, South Africa, India, Thailand

4. Standards Compliance

This equipment is designed and manufactured in compliance with:

• GB/T 23257-2017

• DIN 30670

• ISO 21809-1

• ISO 8501-1 (Sa 2.5)

All coating parameters (FBE >=150um, AD >=170um, PE 3.3-4.2mm per GB/T 23257-2017) can be configured to meet project-specific inspection and test plans (ITP). Coating thickness calculated per formula: coating weight = surface area x thickness x material density.

Why Choose Qingdao Huashida

Innovation is at the core of Qingdao Huashida’s identity, with 58 invention patents, 38 utility model patents, and 38 software copyrights demonstrating continuous technological advancement. One notable innovation is the patent-pending centering device for pre-insulated pipe production, which eliminates eccentricity issues that plague many competing systems - a problem that directly causes material waste and quality rejection. The company’s high-efficiency nitrided screw technology (38CrMoAlA material, 0.4-0.7mm nitriding depth, >HV740 hardness) delivers 30% higher output at the same power consumption compared to standard screws, directly reducing operating costs for customers.

Established in 2003 and headquartered in a 33,000 m2 industrial park in Qingdao, Huashida’s core technology originates from Germany, strengthened by R&D partnerships with Beijing University of Chemical Technology, Qingdao University of Science and Technology, and Qingdao University of Technology. The company employs over 100 professionals including 4 senior engineers and 15 mechanical engineering technicians. Globally, equipment has been exported to Russia, UAE, Saudi Arabia, Iran, Uzbekistan, Kazakhstan, Nigeria, South Africa, India, and Thailand, with a production base in Uzbekistan and partnership with Solution Berg Pipes in Saudi Arabia. For high-spec oil & gas pipelines, critical infrastructure pipelines, major water transfer projects, projects with strict coating tolerance requirements, this culture of innovation means equipment that incorporates the latest technological advancements, delivering higher efficiency, better quality, and lower total cost of ownership.