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Centrifugal Pump Problems & Answers

By Mike Sondalini

E-Books: Products - Contents - Abstracts - Reliability Training - Reference Books (pocket guides) - Online Store - Why Up-Time E-Books? - Testimonials

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Vibration and out-of-balance equipment

ABSTRACT

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.

Vibration analysis

Continued in "Centrifugal Pump Problems & Answers" E-Book ...

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