USCG USCG General Eng
Set 2 • Question #269 of 498
Launch Interactive Practice Room What is a function of the wearing rings used in most centrifugal pumps?
A
Absorb erosion of high velocity discharge stream
B
Seal pump shaft against entry of air
C
Isolate the discharge side from the suction side.
✓ Correct Answer
D
Dampen the turbulent discharge flow.
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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