3PE Pipe Coating Line for DN426-2540mm, Large Diameter Steel Pipe Anti-Corrosion

Product Specification

Qingdao Huashida 3PE Pipe Coating Line for DN426-2540mm is a professional anti-corrosion coating system designed for DN426mm - DN2540mm steel pipes. This line features proven configuration: sj-90/30 ad extruder (55kw), sj-180/33 pe extruder (315kw, 1000kg/h), 1500kw if heating, 2x55kw shot blasting (850kg/minx2), optional internal fbe coating station available, delivering reliable coating quality for large-diameter oil & gas trunk lines, major water conveyance projects, municipal infrastructure, coastal pipelines. With 315kW PE extruder and 1500kW intermediate frequency heating, this system is optimized for the UAE, Saudi Arabia, South Africa, China, India, large-diameter pipeline projects 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 DN426mm - DN2540mm 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 DN426mm - DN2540mm pipes

3. Heavy-duty spiral conveyor with individual wheel drive handles large-diameter heavy pipes stably

4. Multi-zone intermediate frequency heating ensures uniform temperature across large pipe circumference

         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

Engineered for pipe diameter range of DN426mm - DN2540mm 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, 2x55kw blast wheels, 850kg/minx2, mn13 wear plates, sa 2.5 grade, 90-300 m2/h (Sa 2.5 grade, 50-90um anchor profile), followed by 1500kW intermediate frequency heating, C-type coil, pure water cooling, 1000Hz frequency heating to ~200deg C. Coating application uses SJ-90/30 single screw extruder, 55kW, max output 100 kg/h for adhesive and SJ-180/33 single screw PE extruder, 315kW, max output 1000 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.
 

1. Pipe diameter: 426-2540mm
2. Processing capacity: ≥250m²/h
3. Cleaning level: ≥Sa2.5
4. Materials for production: epoxy powder, adhesive, polyethylene

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.

Applications

This coating line is specifically suited for:

• Large-diameter oil & gas trunk lines, major water conveyance projects, municipal infrastructure, coastal pipelines

• Oil & gas transmission and distribution pipelines

• Municipal water supply and sewage pipelines

• Chemical plant process piping

• Mining and slurry transport pipelines

Target Market: UAE, Saudi Arabia, South Africa, China, India, large-diameter pipeline projects

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

Why Choose Qingdao Huashida

Established in 2003, Qingdao Huashida Machinery Co., Ltd. has grown over two decades into a leading high-tech enterprise specializing in pipeline anti-corrosion and pre-insulation equipment. Headquartered in a 33,000 m2 industrial park in Chengyang District, Qingdao, the company integrates R&D, manufacturing, marketing, and global service under one roof. With over 100 employees including 4 senior engineers, 15 mechanical engineering technicians, and 12 installation and commissioning specialists, Huashida combines deep technical expertise with practical field experience.

The company holds 58 invention patents, 38 utility model patents, and 38 software copyrights, reflecting continuous innovation in pipeline coating technology. 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. For clients in the China, India, Southeast Asia, large-scale water infrastructure projects market, this means access to German-engineered technology backed by Chinese manufacturing efficiency and comprehensive after-sales support.