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Offtake information
The offtake capacity of the tank is the rate at which the liquid vapourises. The offtake capacity of the installed tank(s) must be sufficient to supply all of the appliances at peak demand. The larger the tank the greater the offtake capacity, which is normally quoted in kilowatts per hour (kW/hr).
The following table relates tank capacity to offtake rates. These figures are based on a tank with 10% liquid contents and a temperature of 5˚C
Typical Bulk offtake rates:
|
Propane capacity (litres) |
Max offtake per kW/hr |
Max offtake per kg/hr |
Max offtake per hour scmh |
|
380* |
60 |
2.27 |
4.32 |
|
1200 |
150 |
5.7 |
10.79 |
|
2000 |
187 |
7.1 |
13.45 |
|
2000 underground |
94 |
3.5 |
6.76 |
|
3400 |
261 |
10 |
18.77 |
|
4000 |
269 |
10.2 |
19.35 |
|
4000 underground |
135 |
5 |
9.71 |
|
8000 |
463 |
17.56 |
33.31 |
|
24000 |
1046 |
3.965 |
75.25 |
* 380 litre tanks quoted for information only but not generally available
The effects of reduced ambient temperature on bulk offtake rates:
A lower ambient temperature will reduce the maximum propane offtake rate. The table below gives the tank capacity offtake rates in kW for reduced ambient temperatures. These figures are based on a tank with 10% liquid contents at temperatures of 0˚C and -5˚C
|
Propane capacity (litres) |
Max offtake per hour kW 0˚C |
Max offtake per hour kW -5˚C |
|
1200 |
130 |
110 |
|
2000 |
157 |
127 |
|
2000 underground |
94 |
94 |
|
3400 |
212 |
164 |
|
4000 |
219 |
169 |
|
4000 underground |
135 |
135 |
|
8000 |
377 |
291 |
|
24000 |
876 |
706 |
