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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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