Comprehensive engineering reference for piping temperature-pressure derating, HDPE weight charts, and socket fusion welding parameters
Due to polymer viscoelasticity under continuous heat, maximum permissible working pressures must be calculated according to ISO 15874 guidelines:
| Operating Temp (°C) | Derating Factor (fT) | PN25 Pipe Permissible Pressure | PN20 Pipe Permissible Pressure | Application Guideline |
|---|---|---|---|---|
| 20°C (Cold Water) | 1.00 | 2.50 MPa (25 bar) | 2.00 MPa (20 bar) | Municipal water mains, residential cold riser |
| 40°C (Warm Water) | 0.85 | 2.12 MPa (21.2 bar) | 1.70 MPa (17.0 bar) | Solar & heat pump distribution circuits |
| 60°C (Central Hot Water) | 0.68 | 1.70 MPa (17.0 bar) | 1.36 MPa (13.6 bar) | Hotel & hospital circulation loops |
| 70°C (Radiator Heating) | 0.54 | 1.35 MPa (13.5 bar) | 1.08 MPa (10.8 bar) | District heating secondary loop |
| 80°C (Industrial Peak) | 0.45 | 1.12 MPa (11.2 bar) | 0.90 MPa (9.0 bar) | Process hot fluid transport |
| 95°C (Fault Emergency) | 0.30 | 0.75 MPa (7.5 bar) | 0.60 MPa (6.0 bar) | Boiler thermostat failure emergency limit |
Adherence to DVS 2207-11 standards is mandatory. Never rotate pipe or fitting during insertion.
| Pipe Size (OD) | Insertion Depth (mm) | Heating Time (Seconds) | Max Insertion Time (Seconds) | Cooling Time (Minutes) |
|---|---|---|---|---|
| DN20 | 14.0 mm | 5 s (Winter: 7 s) | 4 s | 2 min |
| DN25 | 16.0 mm | 7 s (Winter: 9 s) | 4 s | 2 min |
| DN32 | 18.0 mm | 8 s (Winter: 11 s) | 6 s | 4 min |
| DN40 | 20.5 mm | 12 s (Winter: 15 s) | 6 s | 4 min |
| DN50 | 23.5 mm | 18 s (Winter: 22 s) | 6 s | 5 min |
| DN63 | 27.5 mm | 24 s (Winter: 30 s) | 8 s | 6 min |
