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 (PE-RT II) 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.
It saves the raw materials for using PE-RT II pipe.
Example: Level 2 design pressure: 10 Bar; for cold and hot water transfer in buildings
Selection of different material pipes: the highest PE-RTIIS value; the thinnest wall thickness
Compared to PERT I, PERT II can reduce material use by 15%
Relative to PP-R, PERT II can reduce material use by 30%
Note: According to relevant Chinese national standards and draft
| s | Dia.(mm) | Wall Thickness(mm) | Wall Thickness Area(m2) | Density(kg/m3) | Length(m) | Weight (kg) |
Weight Save PERT/X |
|
| PERT II | S3.2 | 16 | 2.2 | 9.5E-05 | 947 | 1000 | 90 | |
| PERT I | S2.5 | 16 | 2.7 | 1.1E-04 | 933 | 1000 | 105 | -17% |
| PP-R | S2 | 16 | 3.3 | 1.3E-04 | 900 | 1000 | 118 | -31% |
| PERT II | S3.2 | 20 | 2.8 | 1.5E-04 | 947 | 1000 | 143 | |
| PERT eI | S2.5 | 20 | 3.4 | 1.8E-04 | 933 | 1000 | 165 | -15% |
| PP-R | S2 | 20 | 4.1 | 2.0E-04 | 900 | 1000 | 184 | -29% |
| PERT II | S3.2 | 25 | 3.5 | 2.4E-04 | 947 | 1000 | 224 | |
| PERT I | S2.5 | 25 | 4.2 | 2.7E-04 | 933 | 1000 | 256 | -14% |
| PP-R | S2 | 25 | 5.1 | 3.2E-04 | 900 | 1000 | 287 | -28% |
| PERT II | S3.2 | 32 | 4.4 | 3.8E-04 | 947 | 1000 | 361 | |
| PERT I | S2.5 | 32 | 5.4 | 4.5E-04 | 933 | 1000 | 421 | -17% |
| PP-R | S2 | 32 | 6.5 | 5.2E-04 | 900 | 1000 | 469 | -30% |
| Model | Diameter Range (mm) | Extruder (HP) | Power (kW) | Capacity (kg) |
|---|---|---|---|---|
| PERT-110 | 20-110 | 60/33 | 150 | 180 |
| PERT-250 | 75-250 | 75/35 | 220 | 250 |
| PERT-350 | 160-350 | 90/33 | 260 | 500 |


Qingdao Huashida Machinery Co., LTD, is a manufacturer of series of plastic pipe machines, municipal pipe machines, pipe insulation&anticorrosion machines, and pipe jointing&anticorrosion materials, with 21 years of production experience.
Our main products are:
1. HDPE jacket pipe for pre-insulated pipe Production Line
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.
We have been working with more than 400 overseas customers and exporting our products to Kazakhstan, Uzbekistan, Iran, Turkey, Russia, Nigeria and other countries.
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