If the system needs QC (see Frequently Asked Questions), surplus H-gas will be converted into G-gas. The 'QC meter' and related graphical or numerical retrievals provide information about the quantities of QC available and used.
The total quantity of QC is subdivided into three categories:
- QC L-gas enrichment. The quantity of QC which is used to upgrade G-gas to L-gas for exporting to Zevenaar, Winterswijk and Hilvarenbeek
- QC G-gas enrichment. The quantity of QC which is used to enrich incoming G-gas to the maximum possible Wobbe.
- QC G-gas N2. The quantity of QC (H-gas) which is converted into 'pseudo' G-gas by adding nitrogen.
How QC is actually used does not have to take place in the order indicated above. The order of use and which installations are used depends on various gas transport circumstances and optimisations in the gas transport system.
The QC meter shows the status of the amount of QC used in the past hour (in kWh). The QC meter scale runs from zero (bottom left) to the maximum possible quantity of QC (bottom right). This scale contains four colours. The three categories indicated above come first, from left to right (three different colours green). The black section shows the unused quantity of QC. A pointer on this scale shows the total used QC and this value is also shown as a number under the meter.
The QC graph shows the quantity of QC used per hour (in kWh) in the past 14 days. This is subdivided by using three colours green according to the three categories indicated above. The yellow line gives the total used QC.
The QC report above gives the QC volumes (in kWh), subdivided into the three categories. Users can choose from various aggregations (hour, day, month, calendar year and gas year) and various periods.