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

 

 

 

 

84 C

162 C

35 C

65 C

 

 

 

 

84,000 B

162,000 B

86,375 B

163,625 B

 

 

 

 

C = Cubic feet per hour

B = BTU’s per hour

Fuel Pipe Sizing

The tables below 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.

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”.

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 Pipe Size - Gas Flow chart, in cubic feet per hour, specific gravity=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) Gas Pipe Size - Gas Flow chart, in cubic feet per hour, specific gravity=1.50

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

 

 

 

 

 

 

 

 

11

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Briggs & Stratton 10000 Watt manual Fuel Consumption, Natural Gas LP Vapor, LP Vapor Natural

10000 Watt specifications

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