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Thread: Steam Turbine Vacuum system.

  1. #1
    Associate Engineer
    Join Date
    Nov 2017
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    Post Steam Turbine Vacuum system.

    Hello, Newbie here, i have a question about Steam Turbine Vacuum system.

    This is our vacuum interlocks

    • Jet Water Pump press : 5 - 6 bar
    • Vacuum Normal : (-0.86) - (-0.91) bar
    • Vacuum alarm water pump : <-0.75 bar
    • Turbin trip : -0.61 bar



    What might make the vacuum system not work normally and cause a turbine trip? Thx before

  2. #2
    Administrator Kelly Bramble's Avatar
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    Feb 2011
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    Bold Springs, GA
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    Electric motor defective....
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  3. #3
    Project Engineer
    Join Date
    May 2015
    Posts
    77
    Let us assume you are referring to a ejector style pump, ( like these An Alternative to Vacuum Pumps.pdf )

    It is important to remember that pressure does not equal velocity. So the jet pressure reading can be at normal levels even though there is blockage or erosion of the nozzle.

  4. #4
    Associate Engineer
    Join Date
    Nov 2017
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    3
    Thx for your answer sir.

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