4-5 PUMP ASSEMBLY SHAFT INSPECT/TEST/REPLACE (CONT).
Assemble the first stage impeller as follows:
Heat two impeller wear rings (27) to a temperature of approximately 662°F (350 C). Install wear ring (27) onto
impeller (28) and secure with set screws (29).
Install two casing wear rings (30) on impeller (28) and secure with pins (31).
Install shaft sleeve (32) on shaft (2) and secure with two set screws (33) and key (34).
Split rings must be adjusted. Allow 0.039 inch (1 mm) machining allowance.
Install first stage impeller (28) on shaft (2) and secure with key (35) and split ring (36). Adjust split rings as
e. Install seal bushing (37) on shaft (2) and secure with pin (38).
Check the truing of the casing wear rings on the casing housing. Adjust the
casing wear rings and the seal bushing in the casing housing.