Siemens STC-GV Compressor Series

Integrally Geared, Vertically split volute casing

Since its inception 60 years ago, the Siemens STC-GV compressor series has been meeting demands for compression solutions with high efficiencies and pressures up to 200 bar. Siemens STC-GV compressors, designed according to customer specifications and in accordance with both API 617 and API 672, guarantee the highest quality and technical standards for a broad range of industrial applications.


  • The perfect match for all air-separation and process-industry requirements
  • High efficiency and outstanding operating range
  • Powerful and robust design, with integrated turbine or expander options
  • Flexible design concepts combining custom-tailored design with standardized components for maximum reliability
  • Siemens is the only compressor manufacturer who also develops and supplies proprietary gear technology


  • Air separation
  • Ammonia
  • Carbon capture and storage
  • Ethylene oxide
  • Flare mitigation
  • Fuel gas
  • Hydrocarbons
  • Metallurgy
    • Direct reduction
    • Direct smelting
  • Petrochemicals
  • Phenol
  • Refineries
  • Synthetic fibers

Design Concept

Powerful, Robust and Reliable

The Siemens STC-GV integrally geared centrifugal compressors feature a multi-shaft arrangement with different speeds. All shafts are mounted in maintenance-free, oil-lubricated hydrodynamic bearings. With up to eight compressor stages around a central bull gear, the Siemens STC-GV compressor series forms a compact unit for the multi-stage compression of a wide range of gases.

Optimized shaft speeds, modern impellers, tailored aerodynamics and mechanics along with optimized auxiliaries guarantee the highest efficiency. Adjustable guide vane units at the first and / or any other compression stage optimize the operating range. External cooler arrangements allow for operation at extreme site conditions.


  • Integrally geared, multi-stage design
  • Wide operating range and outstanding part-load efficiency at turndown
  • Multi-service capability due to finely-graded standard components
  • Feeds multiple functions from one casing
  • Can be used in toxic, corrosive and hydrocarbon applications
  • Up to eight stages
  • Casing (volutes) fabricated or cast – material: from cast iron to stainless steel
  • Axial inlet to each impeller, intercooling between stages
  • High-efficiency water separators
  • Flexible cooler design
  • Design options for any kind of gas
  • Design code API 617 + API 672

Control Systems
Perfect protection and process control via flexible Siemens compressor automation (SCAUT) control systems:

  • Anti-surge protection
  • Performance controllers acting on mass flow, suction pressure or discharge pressure
  • Simultaneous control of sets of variable inlet guide vanes
  • Controlled by throttling, bypass operation or inlet whirl variation
  • Operation with all available drive systems, i. e. electric motors, steam turbines and gas turbines
  • Fully automatic or semi-automatic start-up and shutdown sequences exactly matched to customers’ process demands
  • Certified safety systems available

Technical Data

  • Volume flow rates up to 480,000 m³/h (280,000 cfm)
  • Discharge pressure up to 100 bar (1,450 psi) air and other gases
  • Discharge pressure up to 200 bar (2,900 psi) CO2
  • Gearbox ratings up to 60,000 kW (80,000 hp)


  • Proven design concept, patented in 1948
  • High efficiency and wide operating range
  • Multi-service capability and various application options in one casing
  • Long life due to process-optimized materials
  • Cost-efficient, compact compression solution
  • Siemens-owned gear technology
  • Flexible cooler design
  • High-efficiency water separators