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

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.