🔍 Key Concepts

• Location and function of the impeller wear ring and volute wear ring in the GS-0012 pump • Difference between parts that protect the shaft (like a shaft sleeve) and parts that protect the pump casing/volute • Why pumps use replaceable wear surfaces at close-clearance points between high-pressure and low-pressure regions

💭 Think About

• On the cross‑section, what two major parts does the wearing ring sit between, and which one would be most expensive or difficult to replace? • Is the wearing ring taking wear from rubbing contact with the shaft, or from very close clearance between the impeller and the stationary casing? • If the clearance between the impeller and casing wears and increases, what happens to pump efficiency and internal leakage?

✅ Before You Answer

• Identify on the illustration which item numbers are labeled Impeller Wear Ring and Volute Wear Ring, and see what surfaces they touch • Confirm which component (shaft, impeller, or pump housing/volute) would normally be protected by a sacrificial, replaceable ring in a centrifugal pump • Verify that another part (like the shaft sleeve) is already provided to protect the shaft itself, so the wearing ring likely serves a different protective purpose