Siemens STC-GC Compressor Series

The compact solution for air separation

The Siemens STC-GC product line is the standard version of the customized integrally geared compressor series Siemens STC-GV. The Siemens STC-GC is an integrally geared compact turbocompressor available in nine frame sizes. This compressor series is also  available as high-pressure version Siemens STC-GC (H).

Siemens is the only compressor manufacturer who also develops and supplies proprietary gear technology.


  • The perfect match for economic air separation
  • Standardized, compact and reliable design
  • Experience for more than 60 years


  • Air separation
  • Compression of process air
  • Compression of nitrogen

Design Concept

Economic Compressor Solution

The standardized design of the Siemens STC-GC product line combines major advantages such as high efficiency, reliability and compact design with shorter delivery periods and lower investment costs. Several different frame sizes and a wide range of options form the ideal basis to offer a very cost-effective, integrally geared centrifugal compressor in a compact single-lift unit.

Powerful, Robust and Reliable

The Siemens STC-GC integrally geared centrifugal compressors feature a multi-shaft arrangement with different speeds. All shafts are mounted in maintenance-free, pressure-lubricated sleeve bearings. With up to four compressor stages around a central bull gear, the Siemens STC-GC compressor series forms a compact unit for the multi-stage compression of air and nitrogen.

Pre-designed gears, highest efficiency impellers, tailored aerodynamics and pre-defined auxiliaries lead to maximum performance.


  • Standardized integrally geared, multi-stage design
  • Up to four stages
  • Axial inlet to each stage
  • Inlet guide vane unit in front of first stage
  • Intercooling between the stages
  • Compact, single-lift unit

Control Systems

  • Perfect protection and process control via flexible Siemens control systems:
  • Anti-surge protection
  • Performance control
  • Fully or semi-automatic start-up and shutdown sequences exactly matched to your process demands
  • Certified safety systems available

Technical Data

Siemens STC-GC

  • Volume flow rates from 10,000 to 120,000 m³/h (5,900 to 70,600 cfm)
  • Suction pressure up to 1.1 bar (16 psi)
  • Pressure ratio up to 20 (machine size 10 – 50)
  • Pressure ratio up to 7.5 (machine size 63 – 100)
  • Electric motor drive (fixed speed)


  • Volume flow rates from 3,600 to 11,000 m³/h (2,100 to 6,500 cfm)
  • Suction pressure up to 5 bar (72.5 psi)
  • Pressure ratio up to 8
  • Driver: Electric motor


  • Compact design
  • Standardized, pre-engineered for economy and reliability
  • Siemens-owned gear technology
  • Highest technical quality standards
  • Optimized performance
  • Short lead times
  • Reduced investment costs
  • Short on-site installation