Safety & Environmental Protection (Deck) USCG Question #1029 (Set 32)

What is the function of wearing rings found on some centrifugal pumps?

Official USCG Answer & Rule Citation

Correct Answer: Option B — Isolate the outlet side from the inlet side

Wearing rings, or impeller/casing rings, provide a tight, renewable clearance seal between the rotating impeller and stationary casing. This minimizes internal fluid recirculation, effectively isolating the high-pressure discharge side from the low-pressure suction inlet to maintain optimal pump efficiency.

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