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Fuel Consumption
See Figure 8 for fuel supply requirements at half and full
load for both natural gas and LP vapor.
Figure 8 — Fuel Supply Requirements
Model
Natural Gas*
1/2
Load
1679-0
100.8
* = 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
NPT
10ft
15ft
½"
168
146
¾"
346
293
1"
653
549
Natural Gas (sg=0.65)
Figure 10 — LIQUEFIED PETROLEUM (LP) GAS Pipe Size - Gas Flow Chart, in cubic feet per hour
NPT
10ft
½"
110
¾"
277
1"
428
Liquefied Petroleum (LP) (sg=1.50)
Briggs & Stratton Power Products Home Generator System
Installation Manual
LP Vapor **
Full
1/2 Load
Full Load
Load
177.9 1.16/42.21 2.15/78.24
20ft
30ft
115
93
240
192
446
360
Model 1679-0 requires 177.9 CFH at "Full Load"
15ft
20ft
30ft
96
76
61
192
158
126
360
293
236
Model 1679-0 requires 78.24 CFH at "Full Load"
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.
40ft
50ft
60ft
79
70
63
163
145
132
307
274
250
40ft
50ft
60ft
52
46
42
107
95
87
202
180
164
9
70ft
80ft
90ft
59
55
51
120
113
106
230
211
197
70ft
80ft
90ft
38
36
33
79
74
69
151
139
129
100ft
48
99
187
100ft
32
65
123
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