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Expeller Sealed Pumps:
If an expeller is fitted, the pump should be adjusted to operate with the Impeller having approximately equal
axial clearance with the front and rear casing liners. This slightly reduces the hydraulic pump performance, but
enables the expeller to seal the pump more efficiently (as the pump out vanes on the expeller side of the
impeller work more efficiently when closer to the frame plate liner). If excessive leakage occurs from the
Expeller Seal during pump operation, the Impeller should be adjusted rearwards to minimise axial clearance
between the Impeller and rear casing liner. If seal leakage persists after Impeller adjustment, this indicates that
the intake pressure is excessive for the Expeller fitted and the impeller requires modification. Leakage may be
reduced by fitting a ‘Differential Impeller’.
Periodic Adjustment
Periodic adjustment of Impeller clearance over its operating life is an important factor in maximizing wear life
of both Impeller and front Liner. Regular Impeller adjustment has shown an increase in wear life of typically 20
percent compared with pumps subjected only to initial adjustment however careful gland maintenance is
required to prevent excessive leakage occurring when the impeller is adjusted. The patented ICS Slurry Seal is
self adjusting and unlike gland packed and expeller sealed pumps is not impacted by impeller adjustment.
The recommended procedure for periodic Impeller adjustment is as follows:
•
At initial pump assembly, adjust Impeller to “just clear” the front Liner, as described in (a).
•
After 50 to 100 hours of pump operation, re-adjust Impeller front-end clearance.
•
Re-adjust Impeller front-end clearance a further two or three times at regular intervals over its wear life.
This may coincide with regular pump maintenance intervals, typically 500 hours.
NOTE:
After each Impeller adjustment is completed, the BEARING HOUSING CLAMP BOLTS must be
tightened.
6.
DISMANTLING PUMP AND REMOVAL OF IMPELLER
The procedure for dismantling the pump is generally the reverse of that described for pump assembly.