Freeze Protection
Pre-Insulated pipe is used to reduce heat loss and prevent freezing on both buried and above ground applications – with or without integral heat tracing. Urecon offers a complete computer assisted engineering service providing such information as: heat loss, time to freeze, fluid outlet temperature, minimum flow rates, tracing wattage required, heat gain, etc., all based on the specific requirements of each project. Contact Urecon for custom calculations.
Time to Freeze and Heat Loss for U.I.P.® Pre-Insulated Pipe
| Nominal Pipe Diameter |
Pipe Ambient -18°C (0°F) | Pipe Ambient -34°C (-30°F) | |||||
| Time to Freeze HRS. | Heat Loss | Time to Freeze HRS. | Heat Loss | ||||
| mm | in | No Insulation | 50 mm (2 in) U.I.P.® |
(watts/m) | No Insulation | 50 mm (2 in) U.I.P.® |
(watts/m) |
| 19 | 0.75 | 1 | 18 | 1.7 | 1 | 9 | 3.1 |
| 25 | 1 | 1 | 40 | 2.0 | 1 | 21 | 3.6 |
| 30 | 1.25 | 1 | 40 | 2.2 | 1 | 21 | 4.1 |
| 40 | 1.5 | 1 | 50 | 2.4 | 1 | 26 | 4.4 |
| 50 | 2 | 1 | 71 | 2.8 | 1 | 38 | 5.1 |
| 75 | 3 | 1 | 121 | 3.6 | 1 | 64 | 6.5 |
| 100 | 4 | 2 | 175 | 4.3 | 1 | 93 | 7.8 |
| 150 | 6 | 3 | 295 | 5.7 | 2 | 156 | 10.4 |
| 200 | 8 | 6 | 413 | 7.0 | 3 | 219 | 12.8 |
| 250 | 10 | 9 | 542 | 8.3 | 5 | 286 | 15.2 |
| 300 | 12 | 13 | 665 | 9.5 | 7 | 352 | 17.5 |
| 350 | 14 | 15 | 744 | 10.3 | 8 | 392 | 18.9 |
| 400 | 16 | 20 | 862 | 11.5 | 10 | 456 | 21.0 |
| 450 | 18 | 28 | 996 | 12.5 | 14 | 514 | 23.5 |
| 500 | 20 | 36 | 1180 | 13.6 | 18 | 609 | 25.6 |
Note:
- No safety factor included; results are nominal; assumes initial water temperature of 1.11°C (34°F).
- To convert watts to BTU, multiply by 3.414.
- To convert meters to feet, multiply by 3.28.
- Values are approximate and are based on schedule 40, steel pipe.