External 3PE + Internal FBE Coating Line, Combined External 3-Layer PE and Internal Epoxy Powder System for DN426-2540mm

Qingdao Huashida External 3PE + Internal FBE Coating Line is a professional anti-corrosion coating system designed for DN426mm - DN2540mm steel pipes. This line features integrated internal spray manipulator, independent internal heating system, internal shot blasting (DN426-DN2600), synchronized internal-external process control, proven in multiple projects, delivering reliable coating quality for oil & gas pipelines requiring both external corrosion protection and internal flow efficiency, water injection pipelines, high-corrosion service lines.

With 315kW PE extruder and 1500kW intermediate frequency heating, this system is optimized for the China, Russia, Middle East, oil & gas majors, high-corrosion 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. Integrated internal and external coating in one line, reducing pipe handling and production time

2. Independent internal spray manipulator with adjustable rotation speed for uniform internal coating

3. Dual heating zones for synchronized internal and external powder curing

4. Internal shot blasting capability (DN426-DN2600) with dedicated dust collection system

5.Proven internal-external FBE technology in domestic DN2540mm project

The anti-corrosion coating processing line includes:

Coating Process: External 3PE + Internal FBE epoxy powder coating, integrated internal and external processing

3PE + Internal FBE Coating Process Sequence:

Pipe Loading -> External Shot Blasting -> Internal Shot Blasting
-> Pipe End Masking -> Pipe Heating -> Internal Epoxy Powder Spraying
-> Intermediate Frequency Heating -> External FBE Powder Spraying
-> AD Adhesive Wrapping -> PE Wrapping -> Water Spray Cooling
-> Joint Cutting -> Holiday Detection -> PE Beveling -> Unloading

Note: This integrated line includes both external and internal surface preparation and coating stations, enabling complete internal-external anti-corrosion treatment in one production flow.

3. Key Configuration

Designed for pipe diameter range of DN426mm - DN2540mm, this production line handles standard pipe lengths of 6-15 meters (12m standard). The line begins with external shot blasting using external shot blasting machine, 2x55kw blast wheels, 850kg/minx2, mn13 wear plates, sa 2.5 grade, 90-300 m2/h, achieving Sa 2.5 cleaning grade per ISO 8501-1 with anchor profile depth of 50-90um. Following surface preparation, the 1500kw intermediate frequency heating, c-type coil, pure water cooling, 1000hz frequency brings the pipe to approximately 200deg C for FBE powder curing.

The coating process employs SJ-90/30 single screw extruder, 55kW, max output 100 kg/h for adhesive application and SJ-180/33 single screw PE extruder, 315kW, max output 1000 kg/h for the top polyethylene layer. Both extruders feature 38CrMoAlA nitrided steel screws with nitriding depth of 0.4-0.7mm and hardness exceeding HV740.

The FBE spraying station uses multi-gun electrostatic spray with redundant (n+1)x2 design, achieving over 95% powder recovery rate. Control is managed through internationally recognized PLC with 10-inch industrial-grade HMI, supporting recipe storage for one-click diameter changeover. VFD options include internationally recognized brands with industrial-grade electrical control components.

Cooling uses water spray quench at <=20deg C and >=0.3MPa with 26-30 m3/h flow rate. End beveling uses a rotary peeler knife completing each end in approximately 40 seconds with kraft paper masking. Final inspection includes high-voltage holiday detection and thickness measurement. The line requires 4-5 operators and workshop height of no less than 9 meters for large diameter configurations.

Internal Coating Stations: In addition to the external 3PE system, this line includes a dedicated internal shot blasting unit (hydraulic drive, 2600-3200 RPM) with three-stage dust collection, an independent internal pipe heating station, and an internal FBE epoxy powder spray manipulator with adjustable rotation speed. The internal coating system operates in sequence before external 3PE coating, with full PLC synchronization between internal and external process parameters.

This coating line is specifically suited for:

• Oil & gas pipelines requiring both external corrosion protection and internal flow efficiency, water injection pipelines, high-corrosion service lines

• Oil & gas transmission and distribution pipelines

• Municipal water supply and sewage pipelines

• Chemical plant process piping

• Mining and slurry transport pipelines

Target Market: China, Russia, Middle East, oil & gas majors, high-corrosion pipeline projects

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

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, Russia, Middle East, oil & gas majors, high-corrosion pipeline projects market, this means access to German-engineered technology backed by Chinese manufacturing efficiency and comprehensive after-sales support.