🔍 Key Concepts

• End suction vs double suction centrifugal pumps – how the liquid enters the impeller • Function and location of impeller wear rings versus casing wear rings • What a double volute casing looks like in cross‑section

💭 Think About

• From the illustration, does the liquid enter the impeller from one side or from two opposite sides? How does that affect whether it’s called end suction? • Look closely at the numbered parts: which one actually forms the replaceable wearing surface on the impeller eye, and which ones protect the casing? • Trace the flow passages in the casing: do you see two separate volute channels around the impeller, or just one? What does that suggest about the casing description?

✅ Before You Answer

• Verify which port is the suction inlet and how it connects to the impeller eye before deciding on statement A. • Identify whether piece #8 is on the impeller or on a stationary part – a true impeller wear ring must be attached to/part of the rotating impeller. • Confirm from the cross‑section whether there are two distinct volute passages (double volute) or a single volute around the impeller before accepting statement C.