Wobbe index


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Wobbe index

[′wä·bə ‚in‚deks]
(thermodynamics)
A measure of the amount of heat released by a gas burner with a constant orifice, equal to the gross calorific value of the gas in British thermal units per cubic foot at standard temperature and pressure divided by the square root of the specific gravity of the gas.
References in periodicals archive ?
Topology processing provides flow direction indication, closed-in area detection, and topological tracing, as well as dynamic coloring based on gas type or Wobbe index, and visual tracking of the concentration of gas compounds.
The reports will include the use of standard measurements for natural gas namely cubic meters (m3) for natural gas under standard temperature and pressure (STP) joules (J) for natural gas energy megajoules per cubic meter (MJ/m3) for superior calorific value and wobbe index percent mole for the chemical composition of natural gas such as methane, oxygen, total inerts milligrams per cubic meters for total sulfur and hydrogen sulfide.
In commercial (non-vehicle) applications, this is evaluated on the basis of the Wobbe Index (WI).
The Wobbe index or Wobbe number is related to CNG energy content and the optimum fuel-to-air ratio.
The Wobbe Index, or WI, value of the gas supplied from the Gulf of Thailand to the Mother Station is at 44 MJ/CBM, well above the figure of 38 MJ/CBM for the gas imported from Myanmar and the Department of Energy Business's benchmark range of 37-42 MJ/CBM for domestic automobile fuel.
Hospital 53b, a toll number N000042, pipeline networks at a pressure of not less than 100 kPa, calorific value of not less than 34 MJ / mA, the calorific value of not less than 31 MJ / mA with a minimum of Wobbe index of 50 MJ / mA, the content of hydrogen sulfide to 7 mg / mA, total sulfur content to 40 mg / mA of mercury vapors to 30 mg / mA.
For the conditioning of natural gas streams, Osorb has demonstrated the ability to capture heavier hydrocarbon components, thus lowering the dew point caused by those components as well as reducing the Wobbe Index, or heating value, of the stream.
*Construction: - the Project can well boast of carrying out routine complex works as part of the scope related to Topsides such as the fabrication and installation of the 600 tonnes, 25 m high external turret and turret mooring system, installation of the prototype four loading arms 75 MT each, lifting, installation and tie-ins for the 2100 MT re-gasification T-16 and the 400 MT T-20 wobbe index modules.
Moreover, tests with increased amounts of nitrogen were conducted on the DLE system - The results verifying that the Wobbe index range for diluted natural gases has now been expanded to 22-53 MJ/NmA.
Spain withheld its assent on the grounds that one of the gas quality criteria (the band covering the Wobbe index, linked to the purity of gas) might be incompatible with liquid natural gas (LNG) from Libya, Qatar or Oman.
* A maximum variation of [+ or -] 4% in the Wobbe Index (WI) from the local historical average gas or, alternatively, the established adjustment or target gas for the service territory.
Some of this upgraded biogas will be delivered to the natural gas distribution grid, which give us the need to calculate/measure the calorific value, and in some cases also wobbe index, density and gas composition in smaller districts than today.