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GENERAL
Diameter
½"
Lowest
expected
(12.70mm) (19.05mm) (25.40mm)
Temperature
1
+20°F (-7°C)
1
0°F (-18°C)
1.5
-20°F (-29°C)
2
-40°F (-40°C)
2.4
-60°F (-51°C)
You can use the number in the above chart to multiply the length of your pipe to pick up the right products. For example, if your pipe is metal, the length
is 20ft, the diameter of your pipe is 1" and the lowest ambient temperature is -20 °F in your area, you will find the "1.3"based on the chart. You can use
20ft x 1.3 = 26ft. You can choose our 30ft JHSF preassemble heating cable (Pick the length wich is close to the number which you calculated).
JHSF can be installed straight along the pipe for some small pipes. At lower temperatures, for longer pipes, the cable needs to be installed by spiral to
ensure the pipe can get the adequate heat from the cable to avoid the freezing.
Water filled Rigid Plastic pipe
¾"
1"
1¼"
(31.75mm)
1
1
1
1.1
1.3
1.6
1.7
2
2.3
2.3
2.7
3.2
2.9
3.3
4.1
1½"
2"
½"
(38.10mm) (50.80mm) (12.70mm) (19.05mm) (25.40mm) (31.75mm) (38.10mm) (50.80mm)
1
1
1
1.8
2.1
1
2.5
3
1
3.6
4.3
1.3
4.7
5.4
1.7
Water filled Metal pipe
¾"
1"
1¼"
1
1
1
1
1
1.1
1.1
1.3
1.6
1.5
1.8
2.1
2
2.4
2.9
1½"
2"
1
1
1.2
1.5
1.8
2.2
2.4
2.8
3.2
3.9
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