Table 2. Plastic Pipe
Number of heating cable runs required
Plastic Pipe | Lowest Expected Temperature |
| ||||
Insulation | Pipe Size | 20°F | 0°F | |||
Thickness |
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|
1/2" |
| 1/2" | 1 | 2 | 2 |
|
|
| 3/4" | 1 | 2 | 2 | 3 |
|
| 1" | 1 | 2 | 3 | 3 |
|
| 1 1/4" | 2 | 2 | 3 |
|
|
| 1 1/2" | 2 | 3 | 3 |
|
3/4" |
| 1/2" | 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" | 2 | 3 | 3 |
|
1" |
| 3/4" | 1 | 1 | 2 | 2 |
|
| 1" | 1 | 1 | 2 | 2 |
|
| 1 1/4" | 1 | 2 | 2 | 3 |
|
| 1 1/2" | 1 | 2 | 3 | 3 |
|
| 2" | 1 | 2 | 3 | 3 |
1 1/2" |
| 3/4" | 1 | 1 | 1 | 2 |
|
| 1" | 1 | 1 | 2 | 2 |
|
| 1 1/4" | 1 | 1 | 2 | 2 |
|
| 1 1/2" | 1 | 1 | 2 | 2 |
|
| 2" | 1 | 2 | 2 | 3 |
|
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|
= Increase insulation thickness
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:
Pipe length: | 16 feet (5m) |
Valves: | 1 ball valve is used |
The water connection is in a crock.
From Table 2, Plastic Pipe, for
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.
ENGLISH
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