Reply to "High vibration on centrifugal pump"

Ralph Stewart posted:


"1x and 3x,  1x = 0.673 mm/s,  3x = 1.162............................. the valve on 10% opened,  the spectrum becomes 1x = 0.334 and 3x = 5.116 mm/s."

I would think it would be a 3 blade  impeller and possibly some type of flow problem, causing vanepass and 1x (at times) to be high, even though it does not show a "raised floor" as you mentioned. May be a worn impeller.

Thanks and Have a Great Day,


Thank you Ralph,


I have just informed by my colleague that the number of blade is 4. I agree with you,  this caused by blade pass or flow problem.


Have a great day