QC/RQC dashboard

Normal Nitrogen usage. Data updated to: 19-08-2017 02:00:00



 

Nitrogen meter


 


Introduction

Above ‘meters’ provides information about the level and the use of GTS’s QC and RQC services.

  • The REMIT reports always have priority over the data shown on this dashboard.
  • Selecting a ‘meter’ will open a new screen with detailed information.

View all frequently asked questions

FAQ

  • 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.