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Transmission system

  • Legend
  • Transit pipeline
  • Intrastate pipeline
  • Pipeline in construction
  • Compressor station
  • Border transfer station

Transit system

The transit pipeline system is used both for the international transportation of natural gas to foreign partners and for the transmission of natural gas to supply the Czech Republic. It consists of pipelines totalling 3,600 km in length, with nominal diameters ranging from DN 800 to DN 1400 and nominal pressures of 6.3 MPa, 7.35 MPa and 8.4 MPa. The first line of the transit pipeline, with diameter DN 900 (known as the “northern branch”), was constructed between 1971 and 1973. Progressive demands for increased transmission capacity then led to the construction of further lines on this northern branch, and over the years 1976 to 1988 the system was expanded by an additional three lines (the “southern branch”) which was connected with the northern branch by a DN 900 pipeline. The most recent addition is a DN 1000 pipeline on the northern branch which was completed in the year 2000.

Natural gas entering and exiting the Czech Republic passes through a system of acceptance and transferral (custody transfer), i.e. it is quantitatively and qualitatively metered and measured at border transfer stations at Lanžhot, Hora Svaté Kateřiny and Brandov, and in Germany at the border transfer stations at Waidhaus and Olbernhau. Gas system technology allows the flow of gas to be diversified at these border transfer stations.

The requisite pressure of the gas in the pipelines is ensured by compressor stations built at intervals of approximately 100 km. On the northern branch, compressor stations are in operation at Kralice nad Oslavou and Kouřim. On the southern branch they are located at Břeclav, Hostim and Veselí nad Lužnicí. The total installed capacity of these compressor stations is 297 MW.

 

Northern branch

Southern branch

Compressor station

Kralice Kouřim  Břeclav Hostim  Veselí n/L 

Number of turbine units

5x 6MW  5x 6MW 9x 6MW  9x 6MW  9x 6MW 
2x 13MW 2x 13MW  1x 23MW     

Installed capacity of CS

 56 MW 56 MW  77 MW  54 MW  54 MW 

Total installed capacity for transmission

297 MW

In addition to the compressor stations, individual lines are also interconnected at key junction points at Malešovice, Hospozín and Rozvadov, as well as at shut-off valve stations half-way between the compressor stations.

National system

The system of national pipelines is connected to the transit pipelines by national transfer stations. The national system is composed of pipelines with a total length of 1,180.450 km. The nominal diameters of the pipes are between DN 80 and DN 700, and the nominal pressures range from 4 MPa to 6.3 MPa. The backbone pipelines of the national system are the Hrušky – Děhylov DN 700 line, the Veselí – Prague DN 700 line and the Hodonín – Hněvice DN 700/500 line.

The national pipeline system is connected to the transit system by a total of 6 national transfer stations. From the transmission system of NET4GAS natural gas is transferred via a total of 81 transfer points to the distribution pipeline systems of regional companies. Via 6 transfer points natural gas is supplied to direct customers, and 6 transfer points are built for the purposes of underground gas storage facilities.

From the national pipeline system of NET4GAS natural gas is transferred via a further 75 transfer points to the distribution pipeline systems of regional companies and other direct customers. Custody transfer metering of the quantity of gas is installed at all these transfer stations.

The transit and national gas pipeline systems are managed by two Operating Areas (Bohemia and Moravia).