The ST Series

The ST series is a range of integral single-stage centrifugal turbo compressor / steam turbine-units with single shaft design. Its compact design features a semi-open overhung impeller (3D design) and turbine wheel, supported on a single rotor stand, without coupling or gearbox. This ensures very low steam consumption, low maintenance requirements and smallest footprint size, while operating in harsh environments. The ST series serves demanding duties in its industries - like compression of corrosive, erosive and sticky gases or process gas or air service applications.

Gas flows up to 200,000 m³/h can be handled. The machine provides state-of-the-art safety and reliability at lowest lifecycle costs to their owners, along with minimised initial capital expenditure.

It is optionally available in a design compliant to API Standard 617 engineering practices and testing requirements.

Formerly known as

STC-STO - under Siemens
ECM - under Kühnle, Kopp & Kausch



  • Sulphuric Acid Plants (Metallurgical and Chemical / Fertilizer)
  • Spent Acid Regeneration
  • Air Service
  • Steam Assisted Gravity Drainage
  • Process Gas & Chemical Plants (PA, MA, MMA, EO/EG, Acrylic Acid, Oxo-Alcohol etc.)

Key Features

  • Highest aerodynamic efficiency
  • Widest performance envelope on the market
  • Very low steam consumption
  • Minimum cooling water requirements
  • Modular design principle
  • Standardized components
  • Wide range of proven aerodynamic impeller designs
  • Flow control via variable inlet guide vanes, variable diffusor guide vanes, speed control or combinations
  • Backward curved impellers with three-dimensional blades
  • Excellent wear resistance over the complete impeller
  • Wide range of proven aerodynamic impeller designs
  • Maintenance friendly design
  • Installation in hazardous area possible


Technical Data

Contact details

Raise an Enquiry Direct email address Direct Phone Number
Online Enquiry Form Thomas Baumann
Sales Director Industrial Compression
+49 6233 85 2532

ST Turbo Compressor brochure

Download your copy of the brochure for Sulphuric Acid applications


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If you would like to submit an enquiry please get in touch.