🔍 Key Concepts

• In a centrifugal pump, wear rings/liners are sacrificial surfaces that protect the main casing or impeller from erosion and are usually located where high‑velocity liquid passes close to a stationary surface. • Look for parts that form a replaceable inner surface between the rotating impeller and the stationary casing, often shown as a separate, thin piece fastened to or fitted inside a heavier body. • Compare letters near the inner casing surfaces that see flow, not the shaft, bearings, or external housing. A wear liner is not a seal, gasket, or bearing.

💭 Think About

• First identify the liquid flow path from suction to discharge. Where would the casing be most at risk of erosion and therefore need a replaceable liner? • Among labels G, N, P, and R, which one points to a relatively thin, arcuate piece that appears to be attached to (or sitting inside) a thicker casing wall? • Which letter is clearly not part of the rotating shaft, impeller, or bearings, but instead looks like a stationary, protective surface for the pump body?

✅ Before You Answer

• Verify that your choice is a stationary component attached to or inside the main casing, not part of the rotating impeller or shaft. • Confirm that the piece looks thin and replaceable, with a clear boundary between it and the heavier casing material around it. • Make sure the location coincides with an area of high‑velocity flow where erosion is likely, rather than a sealing, bolting, or support area.