Fuel & gas properties
| Chemical formula |
|
CH4 |
C3H8 |
C4H10 |
| Molecular weight |
kg/k/mole |
16 |
44.10 |
58.12 |
| Boiling point of liquid at atmospheric pressure |
°C |
-161.6 |
-42.1 |
-0.5 |
| Specific gravity of vapour (Air=1) |
|
0.6 |
1.53 |
2.09 |
| Specific gravity of liquid (Water=1) |
|
0.6 |
0.512 |
0.58 |
| Density of vapour |
|
|
1.5 |
1.95 |
| Density of liquid at 20°C |
|
|
0.505< |
0.575 |
| Volume occupied/mass of liquid |
litre/tonne |
|
1957 |
1743 |
| Calorific value at 20°C |
MJ/M3 |
38.7 |
|
|
|
MJ/litre |
|
|
|
|
MJ/kg |
|
|
|
| Latent heat of vapourisation |
kJ/kg |
|
358 |
372 |
| Wobbe index |
|
50.13 |
81.12 |
|
| Specific heat – liquid |
|
|
0.60 |
0.58 |
| Liquid weight |
kg/l |
|
|
|
| Vapour volume from 1 litre of liquid at 20°C |
M3 |
|
|
|
| Vapour volume from 1 kg of liquid at 20°C |
M3 |
|
|
|
| Vapour pressure at 20°C |
kPa g |
|
|
|
| Vapour pressure at 38°C |
kPa g |
|
|
|
| Compustible limits |
% gas in air |
5-15 |
2.2-9.6 |
1.9-8.6 |
| Amount of air to burn 1 M3 of gas |
M3 |
9.78 |
|
|
| Ignition temperature in air |
°C |
612-622 |
|
|
| Maximum flame temperature in air |
°C |
1964 |
|
|
| Auto ignitition temperature |
°C |
|
470 |
410 |
| Critical temperature |
°C |
|
96.7 |
152.1 |
| Critical pressure |
kPa g |
|
42.5 |
38.0 |
| Octane Number |
|
100 |
Over 100 |
92 |
| Chemical formula |
|
CH4 |
C3H8 |
C4H10 |
| Molecular weight |
|
|
|
|
| Boiling point of liquid at atmospheric pressure |
°F |
-256.7 |
-44 |
32 |
| Specific gravity of vapour (Air=1) |
|
0.6 |
1.53 |
2.00 |
| Specific gravity of liquid (Water=1) |
|
0.6 |
0.51 |
0.58 |
| Density of vapour |
|
|
|
|
| Density of liquid at 60°F |
|
|
|
|
| Volume occupied/mass of liquid |
lbs/ton |
|
|
|
| Calorific value at 60°F |
BTU/ft3 |
1012 |
2516 |
3280 |
|
BTU/gal |
|
91690 |
102032 |
|
BTU/lb |
|
21591 |
21221 |
| Latent heat of vapourisation |
BTU/gal |
712 |
785 |
8.8 |
| Wobbe index |
|
1317 |
2034 |
2034 |
| Specific heat – liquid |
BTU//lb/°F |
|
|
|
| Liquid weight |
lbs/gal |
|
4.24 |
4.81 |
| Vapour volume from 1 gallon of liquid at 60°F |
ft3 |
59.0 |
36.39 |
31.26 |
| Vapour volume from 1 lb of liquid at 60°F |
ft3 |
23.6 |
8.547 |
6.506 |
| Vapour pressure at 60°F |
psi |
|
92 |
|
| Vapour pressure at 100°F |
psi |
|
176 |
37 |
| Compustible limits |
% gas in air |
|
|
|
| Amount of air to burn 1 M3 of gas |
ft3 |
5-15 |
2.2-9.6 |
1.9-8.6 |
| Ignition temperature in air |
°F |
9.53 |
23.86 |
31.02 |
| Maximum flame temperature in air |
°F |
1200 |
920-1020 |
900-1000 |
| Auto ignitition temperature |
°F |
3568 |
3595 |
3615 |
| Critical temperature |
°F |
|
878 |
770 |
| Critical pressure |
|
|
|
|
| Octane Number |
|
100 |
Over 100 |
92 |
All values are approximate.
