INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
30 SUMMIT PUMP MODEL CCFM GENERAL PURPOSE
13 CASING RING WEAR
The bronze casing ring (07) is designed as a wearable item. If pump performance drops, head and
flow, it is likely the casing ring (07) tolerance has exceeded the accepted value. Casing ring’s inner
diameters are designed to be 0.004 inches to 0.008 inches larger than the impeller hub’s diameter.
If too much clearance is present, flow will recirculate back to the suction from the discharge as
shown in Figure 13-1. This increases wear of parts, reduced performance, increased operation noise
levels and decreased pump efficiency.
It is critical to keep pump operating at its peak to maintain expectations with the pump rating for the
PEI (Pump Energy Index).
If using a stainless casing (01), there is no wear ring (07) of which the casing would need to be
replaced if worn.
Figure 13-1: Casing ring (07) recirculation
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