Hermetically Sealed Compressors

Siemens offers two designs of high-speed electric motor driven hermetically sealed compressors. These types of compressors are particularly suited for remote unmanned operation and operators focused on minimal weight and space requirements, minimal system complexity, as well as low installation cost. Due to their absolute gas tightness they add to environmental compatibility and operational safety in hazardous environments or where particularly stringent environmental considerations play a major role. Hermetic sealing is achieved by placing the entire rotor system, including the motor, bearing system and compressor within a pressure containing enclosure requiring no shafts penetrations of the compressor casing. This eliminates the need for shaft seals and their associated auxiliary systems. By using active magnetic bearings there is no need for lubrication oil systems, eliminating the need for lube oil handling and spill prevention. The use of active magnetic bearings with advanced control algorithms, and the variable frequency drive system, enable unmatched flexibility in the speed ranges that can be achieved by these machines.

Image Gallery

Hermetically Sealed Compressors


  • Zero emission
  • CO2 injection         
  • N2 injection
  • Natural gas injection / re-injection
  • Gas / oil separation
  • Gas gathering        
  • Enhanced oil recovery      
  • Wellhead / depletion compression  
  • Export gas
  • Gas treatment        
  • Wet gas     
  • Subsea boosting    
  • Sour/acid gas boosting
  • Pipeline transmission and distribution
  • Natural gas storage and retrieval

Design Features

Design features

  • Volume flows from 250 to 10,000 Am3/h, 150 to 5900 Acfm
  • Casing pressure up to 220 bar, 3200 psi
  • Speed up to 13,000 rpm
  • Electric motor with variable frequency drive
  • Canned active magnetic bearings, electric motor and compressor

Design features

  • Seven compressor frame sizes
  • Volume flows from 800 to 170,000 Am3/h, 500 to 100,000 Acfm 
  • Casing pressure up to 350 bar, 5,000 psi
  • Speed up to 16,000 rpm, depending on frame size and power requirements
  • Seven electric motor frame sizes with variable frequency drive
  • Active magnetic bearings for electric motor and compressor
  • Package available with integrated gas/liquid separator for wet gas handling

Contact Us

product finder key visual

Can't find what you're looking for? Try our Product and Solution Finder!

Our product and solution finder can help you determine which offerings in our portfolio are best suited to your application needs. The tool allows you to access both Siemens and Dresser-Rand information.