Fuel Gases - Wobbe Index
Wobbe index for some common fuel gases - propane, butane, methane and more
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The Wobbe Index indicates the interchange ability of fuel gases and is the best indicator of the similarity between natural gas and a specific propane-air mixture.
| Fuel Gas | Upper Wobbe Index (kcal/Nm3) |
Lower Wobbe Index (kcal/Nm3) |
| Hydrogen | 11,528 | 9,714 |
| Methane | 12,735 | 11,452 |
| Ethane | 16,298 | 14,931 |
| Ethylene | 15,253 | 14,344 |
| Natural Gas | 12,837 | 11,597 |
| Propane | 19,376 | 17,814 |
| Propylene | 18,413 | 17,180 |
| n-Butane | 22,066 | 20,336 |
| Iso-Butane | 21,980 | 20,247 |
| Butylene-1 | 21,142 | 19,728 |
| LPG | 20,755 | 19,106 |
| Acetylene | 14,655 | 14,141 |
| Carbon Monoxide | 3,060 | 3,060 |
Since the Wobbe index relates heating characteristics of blended fuel gases it can be used to obtain constant heat flows from gases of varying compositions.
Note! The Wobbe Index does not relate flame temperatures, heat transfer coefficients or temperature gradients.
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