Natural gas specifications
The Natural Gas Specifications document, which forms part of the connection agreement, contains an overview of the general specifications that the natural gas supplied must meet. The specifications are identical for all connected companies withdrawing high-calorific gas. The same is true for all companies withdrawing low-calorific gas. Only the minimum and maximum pressures vary between connections: these values are determined on an individual basis in line with the needs of the connected company and the technical and operational options available to Fluxys.
> Example of Natural Gas Specifications for connected companies withdrawing high-calorific gas 
> Example of Natural Gas Specifications for connected companies withdrawing low-calorific gas
How is the quantity of gas delivered established?
Fluxys uses around 80 gas chromatographs spread across its grid to establish the quantity of energy supplied. These chromatographs continuously measure the composition and therefore the precise energy content of the natural gas. The gas chromatographs are located at points where the direction of the natural gas downstream is clearly established. Some natural gas receiving stations at connected companies are also fitted with gas chromatographs.
The data from the gas chromatographs is combined with measurements for, amongst other things, pressure, temperature and volume in the natural gas receiving stations at the connected companies in order to calculate the quantity of energy supplied.
Contact
Ludo Hanot
Tel.: +32 2 282 77 17
Fax: +32 2 282 02 50
E-mail: info.transport@fluxys.com
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