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Electric heating trace designing

The heat conductivity of kinds of material under various temperature

 Heat-insaluting material
Heating quotiety(W/m℃)
-10℃
10℃
50℃
100℃
150℃
200℃
 Glass Fibre
0.033
0.036
0.040
0.046
0.053
0.059
 Cliff Cotton
0.041
0.044
0.049
0.056
0.065
0.072
 Scoria Cotton
0.037
0.04
0.045
0.051
0.059
0.066
 Perlite
0.043
0.047
0.052
0.060
0.069
0.077
 Polyurethane Foam
0.022
0.024
0.027
0.031
0.035
0.037
 Polystyrene Foam
0.029
0.031
0.035
0.040
0.046
0.051
 Silicic Acid Calcium
0.050
0.054
0.060
0.069
0.080
0.089
 Compound Silicate FeltFHP-VB
0.022
0.0234
0.026
0.030
0.035
0.038

3、Rated Wattage for Choosing cable
  
See the introduction of kinds of the Cable
4、Caculate the Cable Length

Total Length of
the cable L
=
heat Loss per meter Q
×
(Tube Length+The Converted Length
   for each Tube Accessories)
Rated Wattage for Cable W
  Tube Accessories
Converted Tube Length(m)
  Flange
0.46
  Pipe-supporting
0.60
  Butterfly Valve
0.76
  Ball Valve
0.83
  Globe Valve
1.22
  Gate Valve
1.50

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