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Table 2. Plastic Pipe
Number of heating cable runs required
1C. Calculate the total length of heating cable
required.
Multiply the number of heating cable runs by your pipe length.
Add one extra foot (30 cm) for each valve in your line. Add one
extra foot (30 cm) for the distance to the power connection. For
installations in a crock, add an additional 2 feet (60 cm) of
heating cable. After cutting the Frostex heating cable to the
length you need, proceed to Step 2.
Example:
Pipe size and material: 1 inch diameter, plastic
Lowest ambient temperature: -20°F (-30°C)
Pipe length: 16 feet (5m)
Valves: 1 ball valve is used
The water connection is in a crock.
From Table 2, Plastic Pipe, for -20°F (-30°C), either two or
three runs of Frostex heating cable is required depending on
pipe insulation thickness.
Optimal Pipe insulation thickness: 3/4"
Selecting 3/4" thick insulation requires two runs of Frostex
heating cable installed along the entire length of the pipe (Table
2).
The total length of heating cable equals:
32 ft (10 m) 2 runs x 16 ft (5 m) of pipe
+ 1 ft (0.3 m) for one ball valve
+ 1 ft (0.3 m) for one power connection
+ 2 ft (0.6 m) for installing in a crock
Total length = 36 ft (11 m)
Note: Do not use more than 50 feet (15 meters) of heating
cable per plug. If the total calculated length exceeds 50 feet
(15 meters), you will need additional 9800 FlexFit plugs and
outlets. Longer circuit lengths will blow the nonreplaceable
fuse in the 9800 FlexFit plug. If you require more than 50 feet
per length (15 meters), call Tyco Thermal Controls for informa-
tion on other products.
Lowest Expected Temperature
1/2"1/2" 1 2 2
Pipe SizeInsulation
Thickness
3/4" 1 2 2 3
1" 1 2 3 3
1 1/4" 2 2 3
1 1/2" 2 3 3
1/2"3/4" 1 2 2 2
3/4" 1 2 2 3
1" 1 2 2 3
1 1/4" 1 2 3 3
1 1/2"
3/4"
1"
1 1/4"
1 1/2"
2"
3/4"
1"
1 1/4"
1 1/2"
2"
233
1" 1 1 2 2
1122
1223
1233
1233
1 1/2" 1 1 1 2
1122
1122
1122
1223
Plastic Pipe
20°F
(–10°C)
0°F
(–20°C)
–20°F
(–30°C)
–40°F
(–40°C)
3
ENGLISH
= Increase insulation thickness