17
6
Thermal Insulation
Raychem-IM-H57548-HWATsystem-EN 16/08
6.1
Insulating the System
Pipes must be insulated with the correct thermal
insulation to maintain the desired pipe tempera-
tures. For pipes 1 1/4 inches and smaller, use insu-
lation that is oversized by 1/4 inch to allow room
for insulating over the heating cables. The thermal
insulation schedule is shown in Table 2.
TABLE 2: FIBERGLASS INSULATION SCHEDULE
1/2
3/4
1/2
3/4
1
1
1
1 1/4
1
1 1/4
1 1/2
1 1/2
1 1/2
1 1/2
1 1/2
2
2
2
2 1/2
2 1/2
2 1/2
3
3
3
Copper pipe
IPS insulation
Insulation
size (in)
size (in)
thickness (in)
Important: For pipes 3 inches and larger, the
thickness of insulation can be equal to the pipe diam-
eter with one run of heating cable or 1/3 the pipe
diameter with two runs of heating cable.
6.2
Insulation Installation
• Before insulating the pipe, visually inspect the
heating cable and connection kits to ensure they
are properly installed and there are no signs of
damage. Damaged cable or connection kits must
be replaced.
• Check that the insulation type and thickness com-
plies with the insulation schedule detailed in Table
2.
• Insulate the pipes immediately after the heating
cable is installed and has passed all tests to mini-
mize damage to the cable.
• Insulate the pipe at floor and wall penetrations.
Failure to do so will cause cold spots in the water
system and could lead to damage to the heating
cable. If local codes do not allow this, the heating
cable should be run through a conduit or channel
before the firestop is installed. Use a fire-resistant
6
Thermal Insulation
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