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  • Users: feo1966
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  1. feo1966

    Does Suction Specific Speed Vary with Actual Operating Speed

    Hi, I had been under the assumption that the calculation of Suction Specific Speed used the actual operating speed, not the maximum design speed. Last week, I noticed that the Goulds E-Prism program shows the same Nss regardless of speed. i.e... they show the same Nss for 3600 rpm, 1800 rpm...
  2. feo1966

    NPSH Margin Reliability Curve

    Hi Several studies and authors have noted that peak impeller damage can happen around 1.5 to 2 X the NPSHR(3%) line. Mr Budris even managed to get that language into the 1998 version of ANSI 9.6.1. Peak erosion, peak noise, peak pulsations, all happen in this area. Once air starts coming...

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