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Centrifugal compressors are often used in some small engines often use an axial-CF or double centrifugal compressor unit to achieve a high overall pressure ratio.

Large centrifugal compressors are used for gas transportation in gas pipelines all around the world. They have the following operating limits:
  • Minimum Operating Speed - the minimum speed for sustentation, below this value the compressor stops or goes to the called "Idle Speed".

  • Maximum Allowable Speed - the maximum design speed for the compressor, beyond this value the vibrations increase rapidly, becoming dangerous for the equipment.

  • Stonewall or Choke - occurs when the velocity of the gas approaches its sonic speed somewhere in the compressor (it may occur at the impeller inlet or at the vaned diffuser inlet). It is generally not detrimental to the compressor.

  • Surge - normally occurs at about 50% of design inlet capacity at design speed, is the point at which the impeller cannot add enough power to overcome the discharge pressure. This causes flow reversal (surge), high vibration, temperature increases, and rapid changes in axial thrust that can damage the labyrinth seals or even the driver.