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Mechanical Vibration caused by fluid effects are usually ... Cavitation, Turbulence and Blade Pass. Note that these are not mutually exclusive and are often signs of wear on a pump. If you have a vibration analyzer you can spot the problem easily in the FFT Spectrum as blade pass is the running speed x number of blades. The patterns for Cavitation and Turbulence can be found at vibronurse (www.vibronurse.com) .... sorry I can't paste them in here!!! If you select the Vib Analysis guide and then the Vibrary and then select Hydraulic and Aerodynamic forces you will see the spectra.

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