Briggs & Stratton 206484GS manual LP Vapor Natural, Fuel Comparison Chart, Gas

Fuel Comparison Chart

Physical Properties	LP Vapor	Natural
		Gas
Normal Atmospheric State	Gas	Gas
Boiling Point (in °F):
Initial	-44	-259
End	-44	-259
Heating Value:	83,340	63,310
BTU per gallon (Net LHV*)
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”.

Required Propane Tank Size

The required size of the propane tank at various temperatures when kept at least half full is shown below in the chart. Given the gas withdrawal rate and the lowest average winter temperature, an installer can specify the required LP storage tank size.

Withdrawal Rate	32° F	20° F	10° F	0° F	-10° F	-30° F	-40° F
50 CFH	115	115	115	250	250	400	600
100 CFH	250	250	250	400	500	1000	1500
150 CFH	300	400	500	500	1000	1500	2500
200 CFH	400	500	750	1000	1200	2000	2500
300 CFH	750	1000	1500	2000	2500	4000	5000

14 BRIGGSandSTRATTON.COM