Page 108 - Practical Machinery Management for Process Plants Major Process Equipment Maintenance and Repair
P. 108
Installation, Maintenance, and Repair of Ertical Pumps 93
--
-- MDOO
--
--
Figure 2-16. Balance tolerance nomogram for rotor mass above 50 kilograms.
Mounting of Impellers on the Shaft
The use of collets is a common and satisfactory method for mounting
impellers on the shafts of small vertical turbine-type pumps, generally
limited to pumps with bowl outside diameters less than 18 in. and shaft
diameters less than 23/16 in. The collets are split along me side, have an
inside diameter equal to the diameter of the shaft and are taped on the
outside to fit €he tapered bore of the impeller. When clean, free from
nicks and scratches and properly driven into the impeller bores, collets
will lock the impellers in place axially and radially, and will transmit the
