Centrifugal Pump Problems & Answers
By Mike Sondalini
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Vibration and out-of-balance equipment
When spinning equipment is out of balance. Vibration from out-of -balance rotating equipment can be frightening. The ground shakes, machines jump about, hold down bolts come loose and parts break. An unbalanced rotating body will produce forces on its bearings and transmit them throughout its structure and into the foundations.
Keywords: rotor, centrifugal forces, balance quality.
CAUSES OF OUT-OF-BALANCE
Below lists some common causes for unbalance.
Bent or bowed between support bearings
Overhung weight bends shaft under gravity
Unevenly distributed solid or liquid inside rotor
Loose parts on the rotor
Eccentrically manufactured diameters on the rotor
Misalignment of the drive train to the rotor axis
Loose drive couplings flop about
Loose tolerances between assembled parts on rotor
Shoulders on rotor manufactured out-of-square to axis
Voids or cavities within the rotor
Misalignment of bearings force shaft to bow
The drawings below provide examples of some of the problems listed in the table above.
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