8-6
Standby Generator Sets
Installation
TABLE 1 — VAPOR CAPACITY OF PROPANE STORAGE TANKS (FOR REFERENCE)
To Use: Go to the First column and pick the required kW load and then pick the minimum ambient temperature
(40º, 20º or 0º F) that the generator would be operating in. The third column (tank capacity) will give the required
tank size to continually produce the given fuel flow.
Propane storage tanks can provide either a liquid or a vapor supply to the generator. The above chart is for vapor
withdrawal only and provides the kW output or amount of vapor that can be withdrawn at a given temperature
while keeping the temperature of the liquid above the boiling point. If the withdrawal rate is too high, the LP
temperature goes below the boiling point, the pressure drops to zero and no vapor can be withdrawn. A primary
regulator is also required at the tank to reduce the line pressure to the generator to 5-14 inches of water column
for units less than 70kW or 11-14 inches of water column for units 70kW and above.
Propane Conversions: 36.38 ft
3
= 90,500 btu = 1 gal • 1lb = 21,500 btu = 8.56 ft
3
Figure 1.5 — Propane Storage Tank
Operating
Max kW Minimum Hours @ Tank Capacity Length Dia Overall
Vapor Temp Max kW (Gallons) Inches Inches Ht. Inches
30 40 24
20 20 35 120 57 24 33
10 0 67
35 40 26
25 20 36 150 68 24 33
12 0 72
60 40 26
40 20 38 250 94 30 39
20 0 74
80 40 26
50 20 40 325 119 30 39
25 0 77
100 40 31
60 20 51 500 119 37 46
30 0 100
150 40 35
100 20 53 850 165 41 50
50 0 105
170 40 36
120 20 51 1000 192 41 50
60 0 103
Install003 Rev. A 06/06
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