Fuel Consumption - Briggs & Stratton Home Generator System Installation & Start-Up Manual

When the initial test runs are completed, the manometer
is removed and the port is plugged. A typical final fuel
connection assembly is shown here, where (A) is the fuel
supply and (B) goes to the home generator.
A
Fuel Pipe Sizing
The tables below provide the maximum capacity of pipe in
cubic meters (feet) of gas per hour for gas pressures of
35 mbar or less and a pressure drop of 0.7 mbar. 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 3m 4.5m
3/4" 9.8 8.3
1" 18.5 15.5
Natural Gas Pipe Size - Gas Flow chart, in cubic meters per hour, specific gravity=0.65
NPT 3m 4.5m
3/4" 7.8 5.4
1" 12.1 10.2
Liquid Propane (LP) Gas Pipe Size - Gas Flow chart, in cubic meters per hour, specific gravity=1.50
12
B
6m 9m 12m
6.8 5.4 4.6
12.6 10.2 8.7
6m 9m 12m
4.5 3.6 3.0
8.3 6.7 5.7

Fuel Consumption

Estimated fuel supply requirements at half and full load for
natural gas and LPG vapor fuels are shown below.
Natural Gas
1/2 Load Full Load
9kW 2.9 C 5.5 C
107 MJ 205 MJ
102,000 B 195,000B
12.5kW 3.5 C 6.9 C
133 MJ 255 MJ
126,000 B 242,000 B 140,000 B 270,000 B
13.5kW 4.5 C 8.3 C
168 MJ 308 MJ
160,000 B 293,000 B
C = cubic meters per hour
MJ = megajoules per hour
B = BTU's per hour
Physical Properties
Normal Atmospheric State
Heating Value:
MJ / m 3 (nett LHV*)
MJ / m 3 (gross**)
Density***
* 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 Meter of Gas per Kg of Liquid".
15m 18m 21m
4.1 3.7 3.4
7.8 7.1 6.5
15m 18m 21m
2.7 2.5 2.2
5.1 4.6 4.3
LPG Vapor
1/2 Load Full Load
1.2 C 2.2 C
108 MJ 207 MJ
103,000 B 197,000 B
1.6 C 3.0 C
147 MJ 283 MJ
N/A N/A
N/A N/A
LPG Vapor Natural
Gas
Gas Gas
86.1 37.5 to 43
93.1
0.54 1.67 to 1.43
24m 27m 30m
3.2 3.0 2.8
6.0 5.6 5.3
24m 27m 30m
2.1 2.0 1.8
3.9 3.7 3.5
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