Briggs & Stratton 40204 - Manual (Page 11)

INSTALLATION
11
Fuel Consumption
See Figure 7 for estimated fuel supply requirements at half
and full load for both natural gas and LP vapor.
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.
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.
Natural Gas* LP Vapor**
1/2 Load Full Load 1/2 Load Full Load
12kW 102 195 41 79
15kW 140 218 66 96
* = Natural Gas is in cubic feet per hour
** = LP Vapor is in cubic feet per hour
Figure 7 — Fuel Supply Requirements
NPT 10ft 15ft 20ft 30ft 40ft 50ft 60ft 70ft 80ft 90ft 100ft
3/4” 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)
NPT 10ft 15ft 20ft 30ft 40ft 50ft 60ft 70ft 80ft 90ft 100ft
3/4” 277 192 158 126 107 95 87 79 74 69 65
1” 428 360 293 236 202 180 164 151 139 129 123
Liquid Propane (LP) (sg=1.50)
Figure 8 — NATURAL GAS (NG) Pipe Size - Gas Flow Chart, in cubic feet per hour
Figure 9 — LIQUID PROPANE (LP) GAS Pipe Size - Gas Flow Chart, in cubic feet per hour