Goulds Pumps 7200CB - IOM - Manual (Page 84)

Maintenance
Impeller, intermediate and discharge cover replacement
This table shows the criteria for replacment:
Impeller, intermediate and discharge cover When to replace
parts
Impeller / Diffuser vanes
• When grooved deeper than 1/16 in. (1.6 mm),
or
• When worn evenly more than 1/32 in. (0.8 mm)
Vane edges When you see cracks, pitting, or corrosion damage
Keyway and bores When you see damage
Wear ring surfaces When the clearance to the casing wear ring has
increased by 50% over the values in the Minimum
running clearances table
Impeller checks
• Check and clean the impeller bore diameter.
• Check the impeller balance. Rebalance the impeller if it exceeds the ISO G1.0 (4W/N)
criteria.
82 Model 7200CB, API Type BB5 Barrel Multistage / ISO 13709 2nd Edition / API 610 11th Edition Installation, Operation, and
Maintenance Manual