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The impeller driveshaft can either be top driven or bottom driven. Again there are advantages of each and the choice often varies with scale of operation:
(a) Top driven (laboratory or industrial scale) shaft tends to be longer, power development is worse shaft seal is easier steady bearing required to prevent whipping (required for scales above 100L)
(b) Bottom driven (pilot plant or small industrial scale) shaft is shorter, better power development more space on top plate for ancillaries more difficult seal arrangement
The required shaft diameter can be calculated from the following inequality and is largely determined by the length and power transmission requirements:
Instantaneous Centre: this is a point around which link rotates at a particular instant. Absolute Instantaneous Centre: this is a fixed centre around which link rotates.
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