8.1 Internal services
8.1 - Appendix 8.1A | |
Thermal insulation of water pipes to delay freezing |
Appendix 8.1-A
Thermal insulation of water pipes to delay freezing
Minimum insulation thickness (mm) needed to delay freezing inside domestic premises for cold water systems. | ||||
Outside pipe diameter (mm) |
Thermal conductivity of material at 0°C W/(m-K) | |||
0.025 | 0.030 | 0.035 | 0.040 | |
15 | 30 | 45 | 70 | 91 |
22-28 | 12 | 15 | 19 | 24 |
Notes: The conditions assumed for the table are:
|
Examples of insulating materials | |
Thermal conductivity W/(m-K) |
Material |
Less than 0.020 | Rigid phenolic foam |
0.020 to 0.025 | Polyosocyanurate form and rigid polyurethane foam |
0.025 to 0.030 | PVC foam |
0.030 to 0.035 | Expanded polystyrene, extruded polystyrene, cross-linked polyethlene foam, expanded nitrile rubber and improved polyethylene foam |
0.035 to 0.040 | Standard polyethylene foam, expanded synthetic rubber and cellular glass |