Briggs & Stratton 30000 SERIES Fuel Consumption, Natural Gas LP Vapor, LP Vapor Natural

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

B

Fuel Pipe Sizing

There are numerous on-line or otherwise-published references for fuel pipe sizing. The installer should consider the specific gravity of gas and 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.

Fuel Consumption

Estimated fuel supply requirements at half and full load for natural gas and LP vapor fuels are shown below.

	Natural Gas		LP Vapor
	1/2 Load	Full Load	1/2 Load	Full Load
27kW	259 C	420 C	N/A	N/A
	259,000 B	420,000 B	N/A	N/A
30kW	N/A	N/A	92 C	150 C
	N/A	N/A	228,800 B	373,000 B
C = Cubic feet per hour
B = BTU’s per hour

Physical Properties	LP Vapor	Natural
		Gas
Normal Atmospheric State	Gas	Gas
Boiling Point (in °F):
Initial	-44	-259
End	-44	-259
Heating Value:
BTU per gallon (Net LHV*)	83,340	63,310
BTU per gallon (gross**)	91,547
Cubic feet (gas)	2,500	1,000
Density***	36.39	57.75
Weight†	4.24	2.65
Octane Number:
Research	110+	110+
Motor	97

* 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 Feet of Gas per Gallon of Liquid”.

† Weight is given in “Pounds per Gallon of Liquid”.

12 BRIGGSandSTRATTON.COM