Cnntrifgal Compressor
  • Vote Up0Vote Down spacol June 2008
    Posts: 6
    I have for example a 200 mmscfd compressor that I need to compress my gas from about 50 bar to 75 bar. The compressor is driven by a variable frequency drive electric motor which varies my speed of the shaft.

    1. If my VFD motor malfunctions and speeds up for example, what happens to my process? Do I suddenly get a vacuum at my suction because it is sucking too much?

    2. What if it malfunctions and slows down, do I get a choke at my suction.. or what will I see..??

    Thanks...
  • 3 Comments sorted by
  • Vote Up0Vote Down Rhetoric June 2008
    Posts: 4
    A centrifugal compressor needs two conditions to deliver the output at design conditions:
    1. The impeller eye should remain choked
    2. The impeller should rotate at the design rpm.

    In my opinion, a sudden increase in speed would cause the impeller to 'over-suck' the fluid and a momentary vaccum may occur at impeller eye; and compressor may eventually surge due to impeller eye being not choked.

    A sudden decrease in speed would cause the compressor to stall as the compressor would still be running with a 'choked eye' but without substantial rpm to generate the pressure.

  • Vote Up0Vote Down moklas009 May 2010
    Posts: 1
    There are two main types of compressors used in jet engines. The compressor shown above is called a centrifugal compressor because the flow through the compressor is turned perpendicular to the axis of rotation. The other type of compressor is an axial compressor and is discussed on a separate slide. The very first jet engines used centrifugal compressors, and they are still used on small turbojets and turbo shaft engines.

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  • Vote Up0Vote Down thimothy November 2010
    Posts: 5
    I am working as a supervisor in an oil company and we have got a large number of centrifugal compressors. I would advise him against increasing the speed of the compressor all of a sudden. I am saying this from my personal experience. Two months ago one of my employees did exactly that and as a result the machine stopped functioning. We tried our level best to get it back on track but to no avail. Now we have decided to seek the help of technicians.
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