Nitrogen storage report
If a lot of nitrogen is being used, part of this nitrogen will come from the "Firm Volume Restricted" section (see Nitrogen report). The 'nitrogen storage meter' and related graphical or numerical retrievals provide information about the volume of nitrogen available in the nitrogen storage.
Nitrogen storage meter
The nitrogen storage meter shows the most up-to-date status of the volume of nitrogen available in the nitrogen storage (in m3(n)). The meter scale runs from zero (bottom left) to the maximum volume of nitrogen in the storage (bottom right). This scale contains four colours. There is a dark-green section on the right, if the volume of nitrogen available is shown to be in this area the nitrogen storage is to be used as normal. In the middle is an orange section, if the nitrogen volume reaches this area a REMIT warning is sent, see below. The red section shows the reserve quantity of nitrogen in the storage. If the actual, available quantity of nitrogen reaches this area, the nitrogen storage can no longer be used (including REMIT report, see below). If the light-green section is reached from the dark-green section, there is no alarm. If a REMIT report was sent, this is only withdrawn if the pointer leaves the light-green area and moves towards the dark-green zone. The pointer on this scale shows the actual working volume available. The value shown under the meter gives the working volume from the pointer until the red section.
Nitrogen storage graph
The nitrogen storage graph shows the volume of nitrogen available per hour in the past 14 days (in m3(n)). The same areas and colours are used as those on the nitrogen storage meter. The yellow line shows the actual working volume at the end of every hour.
The nitrogen report above shows also the actual and maximum working volumes of the nitrogen storage (in m3(n)). Users can choose from various aggregations (hour, day, month, calendar year and gas year) and various periods. The value at the end of the aggregation period will be shown. For example with aggregation month, de value of the last hour of that month will be shown.
Nitrogen storage volume and REMIT reports
REMIT reports will be issued as soon as there is hardly any working volume available in the nitrogen storage.
- Nitrogen volume in the orange area (see nitrogen storage meter). An advance notification/warning is issued to indicate that the nitrogen storage is almost empty. Market participants are asked to adjust their H-gas/G-gas balance to reduce nitrogen use.
- Nitrogen volume in the red area (see nitrogen storage meter). Nitrogen is being used from the nitrogen storage reserve capacity. A REMIT report is issued to indicate that the nitrogen storage is empty. Market participants may be called upon to adjust their H-gas/G-gas balance to reduce nitrogen use.
- Nitrogen volume moves from the light-green to the dark-green area. If a REMIT report was issued previously, this is withdrawn.
The GTS transport system contains two physically separate networks that are linked together by blending stations. There is a low-calorific system intended to supply exits with G-gas or L-gas and an high-calorific system for H-gas exits.
Most entries are linked directly to the G-gas or H-gas system. However, some entries lie between G-gas and H-gas in terms of quality. They are incorporated into the G-gas or H-gas system via QC or RQC.
High-quality gases are converted into lower-quality gases by means of a process called QC (Quality Conversion) .
The G-gas system regularly experiences entry shortages, while there is a surplus of gases with a higher Wobbe ( H-gas). The surplus H-gas is converted into G-gas (QC) via blending stations. The amount of QC (converted H-gas) will be shown via the ‘QC-meter’ on the QC/RQC dashboard. If there is little QC, then the H-gas can be blended at no cost with other gases into G-gas quality (this is called enrichment). If a large amount of H-gas has to be converted, then it must be converted into G-gas by adding nitrogen (this gas is called ‘pseudo G-gas’).
When nitrogen is used, the gas transport network must be controlled in such a way that the H-gases with the lowest Wobbes are the first to be transported to the blending stations. This gives the greatest capacity for conversion at the lowest costs.
The amount of nitrogen available and the level of its use are shown on this dashboard via the Nitrogen meter on the QC/RQC dashboard. This means that the maximum QC limits can be clearly distinguished by the amount of nitrogen not yet used. See more detailed information at the Nitrogen report.
Part of the nitrogen may be delivered out of a nitrogen storage. The ‘N2-storage meter’ on the QC/RQC dashboard shows the actual volume available of this storage.
The process of converting low-quality gases into higher-quality gases (H-gas) is called RQC (Reverse Quality Conversion).
Sometimes the gas transport system has a shortage of H-gas entries and a surplus of gases with a lower Wobbe. The surplus low-Wobbe gases are added to the H-gas via blending stations.
It is impossible to indicate the RQC capacity in advance, as it depends on the current qualities of all gases. The RQC capacity can be between 0 m3(n)/h and approximately 1,5 mln. m3(n)/h. The amount of use of RQC will be shown by the ‘RQC-meter’ on the QC/RQC dashboard.
As already indicated, many entries lie between G-gas and H-gas in terms of quality. In general, the QC need is high, so all these gases are converted into G-gas by means of QC. But if the QC need decreases continuously, then gradually more of these gases will be converted to H-gas by means of RQC. At the borderline, both RQC and QC take place simultaneously. It is assumed by definition that the total transport system is in RQC mode if the amount of converted RQC gas exceeds the amount of converted QC gas.
About 40 minutes after every hour the information of that hour becomes available.The ‘meters’ show the status of the last available hour. The graphs and reports show the hourly data updated to include the last available hour. The daily, monthly and yearly aggregations contain data up to and including the last complete gas day.
One of the meters on the QC/RQC dashboard is the most important, depending on the current QC/RQC status. The current status is displayed below the meters on the dashboard. The most important meter is displayed on the home page of the GTS website.
If the gas transport system is using nitrogen for QC, then the Nitrogen meter is important and will be displayed on the home page. If no nitrogen is used but the transport system is still in QC-mode than the ‘QC-meter’ will be displayed. If the transport system is in RQC-mode than the ‘RQC-meter’ will be displayed.