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COMPARISON OF FUEL GAS PROPERTIES

COMBUSTION PROPERTIES

EF +Natural Gas

EF +Propane

EF +Butane

NATURAL GAS

PROPANE

BUTANE

Flame Temp in Open Air, deg. F

3885

3916

3908

3542

3596

3578

Total Heating Value after
Vaporization BTU/lb

28520

22896

22743

24800

19768

19494

Burning Velocity in
Open Air, ft/sec

15.2

14.3

12.5

15.2

12.2

11

Formation Reaction

Exothermic

Exothermic

Exothermic

Exothermic

Exothermic

Exothermic

Primary Combustion
Heating Value BTU/ft3

NA

350

360

55

295

315

Secondary Combustion
Heating Value, BTU/ft3

NA

2270

3240

995

2268

3114

SAFETY
Shock Sensitivity

Stable

Stable

Stable

Stable

Stable

Stable

Explosive Limits
in Open Air, %

5.0 - 59

2.5 - 58

1.7 - 60

5.0 - 59

2.4 - 57

1.8 - 60

Explosive Limits
in Air, %

5.3 - 14

2.25 - 9.40

1.7 - 9.0

5.3 - 14

2.3 - 9.5

1.8 - 8.4

Maximum allowable
Use Pressure

Line

Cylinder

Cylinder

Line

Cylinder

Cylinder

Tendency to Backfire

Slight

Slight

Slight

Slight

Slight

Slight

Reactions with
Common Materials

Few Restrictions

Few Restrictions

Few Restrictions

Few Restrictions

Few Restrictions

Few Restrictions

 

PHYSICAL PROPERTIES

COMBUSTION PROPERTIES

EF +Natural Gas

EF +Propane

EF +Butane

NATURAL GAS

PROPANE

BUTANE

Specific Gravity
of Liquid (60F)

0.514

--

0.576

--

0.507

0.527

Pounds Per
Gallon at 60F

4.26

--

4.8

--

4.22

4.38

Cubic Feet Per
Pound of Gas at 60F

8.48

14.5

8.85

23.6

8.45

9.2

Specific Gravity of
Gas (air=1) at 60F

1.6

0.906

4.48

0.555

1.55

1.42

Vapor Pressure
at 70F, psig

118

--

94

--

120

135

Boiling Range at
760 mm Hg, F

-46

-119

-36 to -4

-250

-44

-50

Latent Heat of
Vaporization BTU/lb

183

--

227

--

184

187

 

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