Gas Expansion Turbines

Main advantages and parameters of ETG I and  ETG II turbines

  • efficient utilization of pressure drops
  • rapid and exact outlet pressure regulation
  • high efficiency of the turbo-set
  • minimization of gas leaks


  • natural gas
  • nitrogen
  • mine gas
  • blast furnace gas
  • coke gas


  • pressure: max. 65 bar abs.
  • temperature (depending on medium): max. 535 °C
  • flow rate: max. 300 tis. Nm3/h


  • pressure: 0,1 bar abs. to 12 bar abs.

Shaft power

  • 300 kW to 12 MW


  • for driving power generators and compressors

ETG I and ETG II gas expansion turbines serve for effective reduction of gas pressure in gas regulation and valve stations of gas distribution networks, in underground gas storages, chemical plants, systems of compressed mine gas, cold and hot air, nitrogen, etc.

Gas expansion turbines are turbo-sets whose design is based on the STG I and STG II steam turbines adapted to different flow medium. Differences are mainly in materials and the design of flow parts and external seals on the shaft. The turbines are mainly used for driving power generators.

Depending on inlet and outlet parameters of the flow medium, regulation is often implemented by setting of angle of the guide blades, which makes it possible to reach optimal efficiency in a wide range of gas flow rate even with varying gas expansion pressure in the turbine.

The gas expansion turbines are also designed for explosive environment - e.g. turbines working with natural gas or turbines for driving air compressors. Naturally, necessary certificates and inspection reports are delivered.
The turbines are delivered including their installation in the machine room or outdoors.


Last but not least, PBS ENERGO offers its customers various models of financing. In cooperation with financial institutions we are ready to offer our customers an optimal financing model for the construction of the plant itself as well as for the medium-term or long-term crediting.

Selected references

Jihomoravská plynárenská