A horizontal split case pump with a single impeller shows a predominant vibration reading at a frequency of 1x the rotational speed of the pump and a lower vibration at a frequency of 2x the rotational speed. The impeller is centrally located between two bearing housings. There is a phase difference of 180º between the axial readings and the radial (horizontal) readings taken at the bearing housings. What do you suspect the cause of the high vibration is?

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A horizontal split case pump with a single impeller shows a predominant
vibration reading at a frequency of 1x the rotational speed of the pump and
a lower vibration at a frequency of 2x the rotational speed. The impeller is
centrally located between two bearing housings. There is a phase
difference of 180º between the axial readings and the radial (horizontal)
readings taken at the bearing housings.
What do you suspect the cause of the high vibration is?
Transcribed Image Text:A horizontal split case pump with a single impeller shows a predominant vibration reading at a frequency of 1x the rotational speed of the pump and a lower vibration at a frequency of 2x the rotational speed. The impeller is centrally located between two bearing housings. There is a phase difference of 180º between the axial readings and the radial (horizontal) readings taken at the bearing housings. What do you suspect the cause of the high vibration is?
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