Generac Power Systems 005191-1 Owner's Manual page 20

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.
Max kW Minimum
Vapor Temp
30
20
10
35
25
12
60
40
20
80
50
25
100
60
30
150
100
50
170
120
60
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withdrawal only and provides the kW output or amount of vapor that can be withdrawn at a given temperature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temperature goes below the boiling point, the pressure drops to zero and no vapor can be withdrawn.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
Standby Generator Sets
Operating
Hours @
Max kW
40 24
20 35
0 67
40 26
20 36
0 72
40 26
20 38
0 74
40 26
20 40
0 77
40 31
20 51
0 100
40 35
20 53
0 105
40 36
20 51
0 103
3
= 90,500 btu = 1 gal • 1lb = 21,500 btu = 8.56 ft
Figure 1.5 — Propane Storage Tank
Installation
Tank Capacity Length
(Gallons) Inches
120 57
150 68
250 94
325 119
500 119
850 165
1000 192
8-6
Dia Overall
Inches Ht. Inches
24 33
24 33
30 39
30 39
37 46
41 50
41 50
3