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Related Literature
EN-DS-02E - U.I.P. Standard System - below grade
EN-DS-03E - U.I.P. system - Spiwrap above grade
EN-DS-04E - U.I.P. System PE casing above grade

Urecon | Celebrating 40 Years | 1969-2009

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 -18C (0F) Pipe Ambient -34C (-30F)
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:

  1. No safety factor included; results are nominal; assumes initial water temperature of 1.11C (34F).
  2. To convert watts to BTU, multiply by 3.414.
  3. To convert meters to feet, multiply by 3.28.
  4. Values are approximate and are based on schedule 40, steel pipe.