USCG USCG General Eng
Set 8 • Question #466 of 498
Launch Interactive Practice Room One of the main functions of wearing rings, as used in a centrifugal pumps, is to __________.
A
maintain radial alignment between the pump impeller and casing
B
absorb all impeller shaft end thrust
C
prevent water leakage to the atmosphere
D
prevent wear of the pump casing and/or impeller
✓ Correct Answer
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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