Wobbe Index

Wobbe Index WI = HHV / √SG - measure of thermal energy delivered through a fixed orifice. Combustors are rated by Wobbe, not calorific value.

LNGGas composition

Higher calorific value HHVMJ/m³Gas specific gravity (air = 1) -

Wobbe Index

54.22MJ/m³

Interpretation

Typical LNG - within H-group

Formula, assumptions, and limits

Gas with identical Wobbe interchanges without burner re-adjustment. Europe's H-band (high calorific) is 48–56 MJ/m³. ISO 6976 gives the reference calculation for HHV from composition. LNG typical WI 50–54.

Symbol legend

Symbol	Meaning	Unit	Source
	Gross calorific value	MJ/m³	ISO 6976 from composition
	Specific gravity vs dry air	-	MW_gas / MW_air