Least Resistance

Bearing protector rings at a Kansas facility reduce the risk of variable-frequency drive voltage causing bearing distress.
Least Resistance
Don Koci, superintendent of water treatment systems, checks for vibration on a vertical hollow-shaft pump motor. (Although the pump is below the motor, the top of the motor provides thrust to the head shaft and is considered the drive end.)

Two months after the 10 mgd (design) Reverse Osmosis Water Treatment Center opened in Hutchinson, Kan., operators heard the whine of fluted bearings coming from a high-service, 250 hp vertical hollow-shaft motor that pumped to the city’s water towers.

The manufacturer replaced...

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