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KW Rating | KW Rating and Bearing Size | Chemical Processing

Q: We need to offer a drive ( GearMotor) for a Mixer with Blade sweep Dia. of 6.56 Ft., Height of Stirrer shaft is 8.202 Ft., rpm - 60, Viscosity - 30 poise, but there is no bearing at the bottom. The question is what would be the KW rating of the Motor and what size of Bearing should be there at the Gearbox output shaft ?

A:

Without more specific information about the impeller type and application, I was forced to be conservative, but reasonable.

Minimum motor size = 140 kW
Minimum shaft diameter = 163 mm
Minimum torque = 22,200 N-m
Minimum bending moment = 25,200 N-m

Bearing size will depend on spacing between bearings, but can be sized from the torque and bending loads.