Which pump component concentrates wear on an economically replaceable part?

• A. Wear rings
• B. Bearings
• C. Seals
• D. Impeller

Answer: (A)

In pumps, some parts are designed to take the wear so that expensive components stay intact. Wear rings are exactly that sacrificial, replaceable surface between the impeller and the housing. As the pump runs, friction and abrasion wear these rings, changing the clearance and, with it, the efficiency. Since wear rings are cheap and easy to replace, the wear ends up concentrated there rather than on the bearings, seals, or the impeller itself. Bearings and seals are more costly and complex to replace, and while the impeller can wear, doing so has a bigger impact on performance and cost. So the design purposefully places wear on the wear rings to protect the more critical parts and keep maintenance economical.