Generac Power Systems Stationary Emergency Generator Installation Manual page 14

General Information
TABLE 3 — VAPOR CAPACITY OF PROPANE STORAGE TANKS
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the kW output or amount of vapor that can be withdrawn at a given temperature while keeping the temperature of the liquid above the boiling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 with-
drawn. A primary regulator is also required at the tank to reduce the line pressure to the generator to 5-14 inches of water column.
Propane Conversions: 36.38 ft
12
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
= 90,500 btu = 1 gal • 1lb = 21,500 btu = 8.56 ft
3
Tank Capacity
(Gallons)
120
150
250
325
500
850
1000
Propane Storage Tank
Length Dia
Inches Inches
57 24
68 24
94 30
119 30
119 37
165 41
192 41
3
Overall
Ht. Inches
33
33
39
39
46
50
50