Natural Gas Pipeline 3PE Coating Equipment, Anti-Corrosion Line for City Gas Distribution Pipe

Qingdao Huashida Natural Gas Pipeline 3PE Coating Equipment is a professional anti-corrosion coating system designed for DN32mm - DN630mm steel pipes. This line features small-to-medium diameter optimized, high-speed production for urban gas projects, compact footprint, o-type coating option for small diameters, proven in multiple urban gas projects, delivering reliable coating quality for city natural gas distribution networks, gas station supply lines, residential and commercial gas piping, gas transmission branch lines.

With 160kW PE extruder and 500kW intermediate frequency heating, this system is optimized for the China, Southeast Asia, Africa, urban gas developers, city gas distribution companies 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. Application-optimized configuration for city natural gas distribution networks, gas station supply lines, residential and commercial gas piping, gas transmission branch lines

2. Field-proven design refined through actual production in Huashida’s own coating factory

3. Customizable coating parameters to meet project-specific requirements

4. Comprehensive quality control system ensures consistent coating quality

5. Turnkey service including factory layout, installation, commissioning and training

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

At the heart of this DN32mm - DN630mm coating line are two precision extruders: SJ-65/30 single screw extruder, 37kW, max output 100 kg/h for the adhesive layer and SJ-120/30 high-efficiency single screw extruder, 160kW, max output 600 kg/h for the polyethylene top layer. The screws are manufactured from 38CrMoAlA nitrided steel, with nitriding depth of 0.4-0.7mm and hardness above HV740, ensuring long service life and stable plasticization.

Supporting the extruders is 500kW intermediate frequency heating, C-type coil, pure water cooling, heating pipes to approximately 200deg C with C-type coil and pure water cooling system. Surface preparation is handled by external shot blasting machine, 90kw, sa 2.5 grade, anchor profile 50-90um, delivering Sa 2.5 cleaning grade with 50-90um anchor profile.

The FBE powder application station features multi-gun electrostatic spray with (n+1)x2 redundant design, recovering over 95% of powder through an integrated reclaim system. The entire line is orchestrated by internationally recognized PLC with 10-inch industrial-grade HMI touchscreen, with VFD from internationally recognized brands and industrial-grade control components. Pipe diameter range covers DN32mm - DN630mm with standard length of 6-15 meters.

Post-coating cooling uses water spray quench system (<=20deg C, >=0.3MPa, 26-30 m3/h), followed by rotary peeler knife end beveling (~40 sec/pipe with kraft paper masking). Quality verification includes high-voltage holiday detection and coating thickness measurement. Staffing requirement is 4-5 operators, with minimum workshop height of 9 meters for large diameter configurations.

This coating line is specifically suited for:

• City natural gas distribution networks, gas station supply lines, residential and commercial gas piping, gas transmission branch lines

• Oil & gas transmission and distribution pipelines

• Municipal water supply and sewage pipelines

• Chemical plant process piping

• Mining and slurry transport pipelines

Target Market: Russia, Kazakhstan, Nigeria, Middle East, China, global oil & gas 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

What sets Qingdao Huashida apart is not just equipment manufacturing - it is field-proven design philosophy. Unlike manufacturers who only build machines without practical production knowledge, Huashida operates its own coating factory in China. Every design improvement is refined through real production experience, ensuring that machines are battle-tested in actual coating operations before reaching customers. This hands-on approach, combined with 58 invention patents and 38 utility model patents, results in equipment that solves real production problems rather than creating new ones.

Established in 2003 and headquartered in a 33,000 m2 industrial park in Qingdao, the company employs over 100 professionals including 4 senior engineers and 15 mechanical technicians. Core technology comes from Germany, with R&D partnerships with Beijing University of Chemical Technology and other leading institutions. For city natural gas distribution networks, gas station supply lines, residential and commercial gas piping, gas transmission branch lines, this practical heritage means equipment that starts production quickly, runs stably, and requires minimal intervention - qualities that directly translate to higher profitability for coating operators.