Wobbe Index (lower Wl; or upper Wu)

Natural gas — Measurement of properties — Calorific value and Wobbe index

Natural gas — Measurement of properties — Calorific value and Wobbe index

Gases having the same Wobbe index are held to be interchangeable.

The Wobbe Index is said to be gross or net according to whether the calorific value uses is the gross or net calorific value.

Wobbe Index (lower Wl; or upper Wu) means the ratio of the corresponding calorific value of a gas per unit volume and the square root of its relative density under the same reference conditions

Wobbe index (lower Wl or upper Wu) means the ratio of the corresponding calorific value of a gas per unit volume and the square root of its relative density under the same reference conditions

Wobbe index (lower Wl; or upper Wu) means the ratio of the corresponding calorific value of a gas per unit volume and the square root of its relative density under the same reference conditions

Wobbe Index (lower Wl; or upper Wu) means the ratio of the corresponding calorific value of a gas per unit volume and the square root of its relative density under the same reference conditions

Such a parameter may, for example, be the Wobbe index (WI).

Wobbe index (lower Wl or upper Wu)” means the ratio of the corresponding calorific value of a gas per unit volume and the square root of its relative density under the same reference conditions:

Wobbe index (lower Wl or upper Wu)” means the ratio of the corresponding calorific value of a gas per unit volume and the square root of its relative density under the same reference conditions:

The formulae for the calculation of the Wobbe index and Sλ are given in paragraphs 2.25. and 2.26.

Wobbe index (lower Wl or upper Wu)” means the ratio of the corresponding calorific value of a gas per unit volume and the square root of its relative density under the same reference conditions:

Wobbe index (lower Wl or upper Wu)” means the ratio of the corresponding calorific value of a gas per unit volume and the square root of its relative density under the same reference conditions:

Wobbe-index: kWh/m3 (based on GCV

The second fuel may include a gaseous low Wobbe fuel.

Two gasses with similar Wobbe indices are interchangeable.

For GCV, energy and Wobbe-index the default combustion reference temperature shall be 25 °C.

The long-term gas quality monitoring outlook shall cover at least the Wobbe-index and gross calorific value.