Use of the product in the application area, metal-to-metal joints (expander)

Gas expander

Gas expansion units exploit the pressure difference between the natural gas pipeline and the distribution networks or consumers for extracting mechanical or electrical energy.
Today gas expansion plants are representative of the power plant type which exhibits the highest level of conversion efficiency for the generation of electricity. Depending on plant design, 80-90% of the additional fuel energy required for the Spilling expansion engine is converted to electricity. This means that fuel efficiency is far superior to that of the latest gas and steam power plants. Gas expanders are extremely resource-saving in operation and contribute to the overall reduction of CO2 emissions. If waste heat is used for the preheating, the power generation can reduce CO2 emissions nearly to zero. The volumetric control guarantees a high power yield due to consistently high efficiency levels over a wide operative range.

Technical data
Gas expanders

OutputkWfrom approx. 100 to 3.000
Inlet pressurebarfrom 6 to approx. 60 bar
Speedsmin–1750, 900, 1000, variable speeds
Back pressurebarfrom 50 mbar to 25 bar
Gas volume flow ratesm³/sfrom 5,000 to 100,000 Nm³/h

Expansion Turbines

Siemens integrally geared process-gas radial turbines enhance power supply in processes with off-gas or process gas as byproducts. Medium- to high-temperature gas can be used to drive a compressor or an electric generator directly, with no need for additional heat exchange or steam generation equipment. The Siemens STC-GT product line is the ideal solution for gas expansion within a number of chemical processes, and is designed according to both API 617 and API 672.


  • The perfect match for expansion of off-gas and process gas
  • Increases plant efficiencies

Fields of Application

  • Purified terephthalic acid (PTA)
  • Dimethyl terephthalate (DMT)

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