About Transmission

Gas Delivery Station

There are approximately 400 gas delivery stations in our system. Gas delivery stations are to transfer the transmitted natural gas in a regulated manner towards gas distributors and industrial consumers.The natural gas is filtered, the pressure is set to the desired value and the appropriate temperature is ensured at the gas delivery station. The volume of the delivered natural gas is measured, and the individual components of the natural gas are identified [gas quality measurement] with the use of certified and continuously controlled measuring instruments.The natural gas is a colorless and odorless substance in its unprocessed state and therefore to avoid accidents – i.e. to aid perception by humans – odorants are added to the natural gas. Our gas delivery stations are continuously supervised by our regional dispatcher services 24/7, each day of the year. Such remote surveillance allows remote management and intervention. The gas delivery stations exchange data with the control facilities at the headquarters via a high-speed, protected internal IT network.

Pipeline hubs

The junctions of long-distance pipelines are called hubs, where the links in between the individual lines allow the use of routes that can be aligned with changing transmission demands. At the hubs, the gas is filtered as necessary, the quality and quantity are measured and metered and the gas odorization is also carried out if necessary.The design of the pipelines arriving at the hubs makes the performance of regular cleaning and diagnostic tasks possible. There is a pipeline torch at each hub for the safe removal of the natural gas from the connected pipeline sections by means of burning. Due to the high pressure, this kind of pipeline discharge involves considerable noise and light effects, but there is no need for any concern, as the procedure is safe.

Compressor Station

The pressure of natural gas decreases during pipeline transportation due to frictional losses. In order to maintain continuous transmission and increase transmission capacities, pressure has to be raised. This is the function of the compressor stations installed at specific points of the pipelines. In our system, at 8 locations - Beregdaróc, Nemesbikk, Hajdúszoboszló, Városföld, Csanádpalota, Szada, Báta and Mosonmagyaróvár - operate centrifugal compressors that are driven by high-performance gas turbines, similar to the ones used in aircrafts.

Long-distance pipelines

Long-distance pipelines carry natural gas from domestic production sites, underground gas storage facilities and the crossing points at the national borders to gas distribution companies, the in-take points of industrial consumers and the national borders of the country. They typically serve natural gas transmission in between large geographic regions and supply a number of delivery points.The long-distance pipeline system in figures:                 
  • Total length in Hungary: 5889 km
  • Length of a single long-distance pipeline: 1–100 km
  • Diameter: 80–1400 mm
  • Nearly 400 independent underground pipelines
The pipelines are made of high-strength steel and feature corrosion protection.

Control centers

The supervision and control of the complex technological system consisting of the compressor stations, long-distance pipeline network, hubs and gas delivery stations are crucial for the continuous and safe operation of the system. This gas technology, operated by FGSZ Ltd, is a complex network of conventional mechanical engineering units, modern industrial IT devices, high-precision measuring instruments and security equipment.Continuous and safe gas transmission functions can only be realized with reliance on the centralized control systems.In the country-wide system, it is the 6 territorial centers of the 3 regions and the national headquarters operated in Siófok that are in charge of these control tasks.

Filtering–measuring stations

Filtering–measuring stations are responsible for removing contaminations from the delivered/received natural gas, as well as metering and measuring the volume and quality of gas with the use of certified instruments of continuously controlled measuring accuracy. These filtering–measuring stations are located at such points of our system where the pressure of our system (in the long-distance pipelines) is identical to the pressure prevailing in the connected party’s side.