The polyurethane PERT pre-insulation pipe-internationally known as a flexible pre-insulated pipe-is defined in Chinese standards as Type II Heat-Resistant Polyethylene Low-Temperature Direct-Buried Heating Pipe.

This production line adopts a one-step continuous foaming process, ensuring stable performance, high production efficiency, and long-term reliability for district heating applications.

• High Temperature Resistance: PERT II pipes can tolerate temperatures up to 110°C, ensuring reliable performance in high-temperature heating systems.
• Efficient Heat Transfer: With a 60°C supply water and 45°C backwater temperature, these pipes meet heating demands efficiently, reducing energy consumption and costs.

• Smooth and Pure Surface: The pipeline is smooth, free from impurities, and non-polluting, ensuring a clean and safe heating environment.
• Automated Operation: Heating companies can achieve unattended, automated operation, reducing labor costs and increasing operational efficiency.

• Simplified Construction: The construction process is simple and convenient, with a 40% reduction in excavation volume, greatly reducing construction costs and time.
• Material Savings: Compared to traditional materials like PERT I and PP-R, PERT II pipes offer significant material savings. For example, compared to PERT I, PERT II can reduce material use by 15%, and compared to PP-R, it can reduce material use by 30%.

Technical process

Steel pipe loading → Pipe clamping & conveying → PE jacket extruding → PU foaming → Hydraulic correction of foam layer → Spray cooling → Positioner correction → Pipe connector cutting → Electric acceleration pipe removal → Heat shrink band end protection → Finished pipe inspection → Marking, packaging & offloading

With 23 years of experience, Qingdao Huashida Machinery is a global leader in plastic pipe and anti-corrosion technology. We have served over 400 overseas customers across regions like Central Asia, the Middle East, and Africa.

Our main products are:
1. HDPE jacket pipe for pre-insulated pipe Production Line (110-2000mm)
2. Rigid pre-insulated pipe Production Line
3. Flexible pre-insulated pipe(PERT) production line
4. Steel pipe FBE/2LPE/3LPE anti-corrosion coating line
5. Steel pipe derusting line
6. PE pressure pipe/Water Gas supply pipe production line
6. PP/PE plastic board/sheet/geomembrane production line
7. NBR PVC Thermal insulation tube/plate production line  
8.Pipeline anti-corrosion materials and instruments: heat shrink joint coating sleeve, electro-fusion weldable joint sleeve, portable welding gun(extruder), PE PP welding rod.