USCG USCG General Eng
Set 8 • Question #443 of 498
Launch Interactive Practice Room If you were operating a centrifugal water service pump with worn wearing rings, the __________.
A
pump would be very noisy
B
pump would vibrate excessively
C
pump would develop insufficient flow
✓ Correct Answer
D
stuffing box would leak
USCG NMC Regulatory Explanation
Wearing rings in a centrifugal pump provide a replaceable sacrificial running surface between the rotating impeller and stationary pump casing, maintaining close clearances to minimize recirculation losses while protecting expensive castings from abrasive wear.
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