3PE Coating Line Upgrade Retrofit Service Existing Line Modernization Equipment

Qingdao Huashida 3PE Coating Line Upgrade and Retrofit Service is a professional anti-corrosion coating system designed for Existing line diameter range (assessment required) steel pipes. This line features plc control system upgrade to international brand, extruder screw optimization (high-efficiency nitrided screw), if heating replacement, dust collection system upgrade, conveying system refurbishment, minimal production downtime, technical assessment before proposal, delivering reliable coating quality for aging coating line modernization, capacity expansion, quality improvement, energy efficiency upgrade of existing plants, production line relocation.

With 280kW PE extruder and 1000kW intermediate frequency heating, this system is optimized for the China, Russia, Europe, plants with 10+ year old lines, coating facility modernization 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. PLC control system upgrade to internationally recognized brand with modern HMI interface

2. High-efficiency nitrided screw optimization increases extruder output by up to 30%

3. Intermediate frequency heating replacement improves energy efficiency and temperature control

4. Dust collection system upgrade ensures compliance with modern environmental regulations

5. Minimal production downtime during upgrade with phased implementation plan

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: Upgrade and retrofit of existing 3PE coating lines: control system, extruder, heating, conveying, dust collection

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 Existing line diameter range (assessment required) 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 Existing line diameter range (assessment required) 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: 56-4200mm
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:

• Aging coating line modernization, capacity expansion, quality improvement, energy efficiency upgrade of existing plants, production line relocation

• 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, Europe, plants with 10+ year old lines, coating facility modernization projects

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

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 Existing line diameter range (assessment required) 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.