The SF Series

The SF series is a range of single-stage centrifugal turbo compressors with an overhung, semi-open impeller (3D design), supported by a separate bearing pedestal, direct driven or provided with a separate gearbox. With this design, featuring highest rigidity and optimised rotordynamic behaviour, the SF series serves the most demanding duties in its industries - like compression of corrosive, erosive and sticky gases and suitable for installation in harsh environments. Gas flows up to 600,000 m³/h can be handled. It sets the benchmark for safety and reliability, at lowest lifecycle costs, in favour of their owners.

With package weights of over 50 tons, this machine is the most heavy duty equipment of its kind on the market.

The SF series is optionally available in a design compliant to API Standard 617, Part 1 & 2.

For design pressures up to 50 bar (g) and gas flows up to 200,000 m³/h, the SF series is also available in a high-pressure design to serve process gas applications and is typically provided with dry gas seals in double or tandem arrangement including a sealing gas panel.

Formerly known as

STC-SO (SFO / SFP / SFN) or STC-SO (FO / FP / FN) - under Siemens
SFO / SFP / SFN - under Kühnle, Kopp & Kausch



  • Sulphuric Acid Plants (Metallurgical and Chemical / Fertilizer)
  • Spent Acid Regeneration Industrial Evaporation Processes
  • Zero Liquid Discharge
  • Steam Assisted Gravity Drainage
  • Process Gas & Chemical Plants (PA, MA, MMA, EO/EG, Acrylic Acid, Oxo-Alcohol, PE, Ammonia, CTL/CTG etc.)

Key Features

  • Highest aerodynamic efficiency
  • Widest performance envelope on the market
  • 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 or radial tip 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
  • OEM packages with Howden steam turbine available


Technical Data

  • Flow rates from 3,000 up to 600,000 m³/h
  • Pressure ratio up to 3.5
  • Impeller diameter up to 2,240 mm
  • Driver of your choice
SF compressor

Process Gas Applications

Technical Features

  • Design as per API Standard 617, Part 1 & 2
  • Materials for impeller and compressor housing according to project requirements
  • Dry Gas Seal (DGS) double or tandem arrangement
  • Sealing gas panel as per project specifications
  • Local Control Panel (LCP) according to project specifications


Technical Data

  • Flow rates from 3,000 up to 200,000 m³/h
  • Design pressure up to 50 bar (g)
  • Temperatures from -150 up to 500 °C
  • Impeller diameter up to 900 mm
  • Pressure ratio up to 3.0
SF Compressor for process gas

Contact details

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

SF Turbo Compressor brochures

Download your copy of the brochures for Sulphuric Acid and Process Gas


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