High 20x vibration

! ! Shabir Ahmad KHAN® posted:

Please see the below vibration data of a centrifugal pump & share your analysis. 

IMG_20181020_164920IMG_20181020_1648571540036374682147120009069244533015400363999931514167335287423221

Hi

Do you have any check valve or flow control valve at discharge ?

Are you sure about NPSH at suction side of pump? Maybe cavitation or other flow induced vibration

 

Is this a variable frequency drive. If yes can u lower the speeds by 100-200 rpm and see what happens to 20X, if not switch off the machine and a take a waterfall diagram of Pump inboard and see the influence of 20X. will it follow a linear pattern/gradually reducing trend or suddenly vanishes as soon as u switch off the pump. Just find out from the pump drawing do u have anything related to "number 20", vanes/blades etc...or may be flow related issue.. need some more trouble shooting before u can conclude....

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