QC/RQC dashboard

Introduction

This dashboard provides information about the level and the use of GTS’s QC and RQC services.

  • The dashboard is in development and various types of information will be added to it in the future.
  • The REMIT reports always have priority over the data shown on this dashboard.


 

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 H-gas converted will in future be published on this 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. 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 meter.

  • 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.

    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.

  • At present, only detailed information about nitrogen use is available. Other types of information will be displayed in future.

    The ‘meters’ show the status of the second-last complete hour. The graphs and reports show the hourly data updated to include the second-last complete hour. The daily, monthly and yearly aggregations contain data up to and including the last complete gas day.

  • One of the meters on this website is the most important, depending on the current QC/RQC status. The current status is displayed on the top line of the dashboard. The most important meter is displayed on the home page of the GTS website.

    At present, only one meter is available on the dashboard. 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 displayed, then the SQS (System Quality Signal) meter will be displayed. In other words, as soon as the SQS meter is on the right-hand edge of the scale it is replaced by the Nitrogen meter.