Fuel Pipe Sizing - Briggs & Stratton Generator Owner's Manual

Fuel Pipe Sizing

Figures 8 and 9 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.
Figure 8 — NATURAL GAS (NG) Pipe Size - Gas Flow Chart, in cubic feet per hour
NPT 10ft 15ft
1/2" 168 146
3/4" 346 293
1" 653 549
Natural Gas (sg=0.65)
Figure 9 — LIQUID PROPANE (LP) GAS Pipe Size - Gas Flow Chart, in cubic feet per hour
NPT 10ft 15ft
1/2" 110 96
3/4" 277 192
1" 428 360
Liquid Propane (LP) (sg=1.50)
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20ft 30ft 40ft
115 93 79
240 192 163
446 360 307
20ft 30ft 40ft
76 61 52
158 126 107
293 236 202
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.
50ft 60ft 70ft
70 63
145 132
274 250
50ft 60ft 70ft
46 42
95 87
180 164
14
80ft 90ft
59 55 51
120 113 106
230 211 197
80ft 90ft
38 36 33
79 74 69
151 139 129
100ft
48
99
187
100ft
32
65
123