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 Vibration analysis on a vacuum pump

shittu olakunle's profile image
shittu olakunle posted 10-13-2023 09:48


I am trying to analyze a spectrum and I am  stucked in between 2 possible causes ( structural looseness or resonance), there are not enough resources (tools

) on ground to distinguish between the two possible causes.

The pump is a belt driven pump using a 400kw motor. High vibration is observed on the DE of the motor in the vertical and axial , however the vibration does not translate to the pump as shown in the pictures below.

I am suspecting it is a structural looseness as suggested in the spectrum and its waveform , and also the pump and motor are not on same base.

Any expert opinion please 

Motor NDE 
Ron Brook's profile image
Ron Brook

The 1x peak in the motor ibv and Iba readings indicates resonance ante base of the peak.  Change Y scale from linear to log to see more clearly.  Yes, I suspect poor vertical support under motor ib side. Usually, these motors sit on Ibeam frames that need to be filled with non-shrinking grout.  Please sends picture of the base.