Fuel Consumption - Generac GEN10AD Manuel D'installation

Fuel Consumption

Estimated fuel supply requirements at half and full load for
natural gas and LP vapor fuels are shown below.
Natural Gas
1/2 Load Full Load
84 C 162 C
84,000 B 162,000 B
C = Cubic feet per hour
B = BTU's per hour
Fuel Pipe Sizing
The tables below provide the maximum capacity of pipe in
cubic feet of gas per hour for gas pressures of 0.5 psi or
less and a pressure drop of 0.3 in. water column. Specific
gravity of gas is shown.
Listed values compensate for a nominal amount of
restriction from bends, fittings, etc. If an unusual number of
fittings, bends, or other restrictions are used, please refer to
federal and local codes.
NPT 10ft 15ft
3/4" 346 293
1" 653 549
Natural Gas Pipe Size - Gas Flow chart, in cubic feet per hour, specific gravity=0.65
NPT 10ft 15ft
3/4" 277 192
1" 428 360
Liquid Propane (LP) Gas Pipe Size - Gas Flow chart, in cubic feet per hour, specific gravity=1.50
Required Propane Tank Size
The required size of the propane tank at various
temperatures when kept at least half full is shown below
in the chart. Given the gas withdrawal rate and the lowest
average winter temperature, an installer can specify the
required LP storage tank size.
Withdrawal Rate
50 CFH
100 CFH
150 CFH
200 CFH
300 CFH
LP Vapor
1/2 Load Full Load
35 C 65 C
87,000 B 164,000 B
20ft 30ft 40ft
240 192 163
446 360 307
20ft 30ft 40ft
158 126 107
293 236 202
32° F 20° F
115 115
250 250
300 400
400 500
750 1000
Physical Properties
Normal Atmospheric State
Boiling Point (in °F):
Initial
End
Heating Value:
BTU per gallon (Net LHV*)
BTU per gallon (gross**)
Cubic feet (gas)
Density***
Weight†
Octane Number:
Research
Motor
* LHV (Low Heat Value) is the more realistic rating.
** Gross heat value does not consider heat lost in the form of water
during combustion.
*** Density is given in "Cubic Feet of Gas per Gallon of Liquid".
† Weight is given in "Pounds per Gallon of Liquid".
50ft 60ft 70ft
145 132 120
274 250 230
50ft 60ft 70ft
95 87 79
180 164 151
10° F 0° F -10° F
115 250
250 400
500 500
750 1000
1500 2000
LP Vapor Natural
Gas
Gas Gas
-44 -259
-44 -259
83,340 63,310
91,547
2,500 1,000
36.39 57.75
4.24 2.65
110+ 110+
97
80ft 90ft
113 106
211 197
80ft 90ft
74 69
139 129
-30° F -40° F
250 400
500 1000
1000 1500
1200 2000
2500 4000
100ft
99
187
100ft
65
123
600
1500
2500
2500
5000
11