9
Briggs & Stratton Power Products Home Generator System
Installation Manual
Fuel Consumption
See Figure 8 for fuel supply requirements at half and full
load for both natural gas and LP vapor.
Fuel Pipe Sizing
Figures 9 and 10 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.This information is based on data
found in Chapter 9 of NFPA Publication 54.
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 NFPA Publication 54.
NPT
10ft
15ft
20ft
30ft
40ft
50ft
60ft
70ft
80ft
90ft
100ft
½”
110
96
76
61
52
46
42
38
36
33
32
¾”
277
192
158
126
107
95
87
79
74
69
65
1”
428
360
293
236
202
180
164
151
139
129
123
NPT
10ft
15ft
20ft
30ft
40ft
50ft
60ft
70ft
80ft
90ft
100ft
½”
168
146
115
93
79
70
63
59
55
51
48
¾”
346
293
240
192
163
145
132
120
113
106
99
1”
653
549
446
360
307
274
250
230
211
197
187
Natural Gas (sg=0.65)
Model 1768-0 requires 177.9 CFH at “Full Load”
Liquefied Petroleum (LP) (sg=1.50)
Model 1768-0 requires 78.24 CFH at “Full Load”
Figure 10 — LIQUEFIED PETROLEUM (LP) GAS Pipe Size - Gas Flow Chart, in cubic feet per hour
Model
Natural Gas*
LP Vapor **
1/2
Load
Full
Load
1/2 Load
Full Load
1768-0
100.8
177.9 1.16/42.21 2.15/78.24
Figure 8 — Fuel Supply Requirements
* = Natural Gas is in cubic feet per hour
** = LP Vapor is in gallons per hour/cubic feet per hour
Figure 9 — NATURAL GAS (NG) Pipe Size - Gas Flow Chart, in cubic feet per hour
