Install Manual

Gaseous Fuel Systems
24 Installation Guidelines For Spark-Ignited Stationary Generators
generator will list fuel consumption rate, usually in
ft
3
/hr. To convert CFH to BTU/hr, multiply by 2,520.
• Fuel consumption rate in gallons per hour (gph)
with generator at 100% load. To convert CFH (pro
-
pane vapor) to gph, divide by 36.38. To convert
BTU/hr to gph, divide by 91,502.
• Desired run time.
• Minimum operating temperature expected.
The most important thing to consider when sizing LP gas
tanks for vapor withdrawal is the vaporization rate of LP
gas tank at minimum temperature expected, and at mini
-
mum fuel level tank will be allowed to reach. Vaporization
rates shown in
Table 4-3 are based on the tank at 20%
fill capacity.
1. Multiply gph fuel consumption rate of generator at
100% load by longest run time expected/desired.
2. Determine fuel consumption in BTU/hr with gener-
ator at 100% load.
3. Determine lowest expected operating temperature.
4. See Table 4-3. Using both Minimum Operating
Temperature and Tank Vaporization Capacity col-
umns, find the BTU/hr vaporization rate of the gen-
erator at 100% load corresponding to the lowest
expected operating temperature.
5. See column 2, and note the Available Tank Capac-
ity. If it is greater than total run time fuel consump-
tion, see column 1 – this is the correct size tank
required. If it is less than total run time fuel con
-
sumption, see next larger tank size. Verify lowest
operating temperature and tank vaporization
capacity.