🔍 Key Concepts

• Single-stage vs. multistage centrifugal pumps (count how many impellers or pressure-raising sections are in the casing) • Single suction vs. double suction (how many suction inlets or "eyes" does the impeller have?) • Open vs. closed impeller (are there shrouds/side plates enclosing the vanes or are the vanes exposed?)

💭 Think About

• Look closely at the cross‑section: do you see more than one impeller or pressure stage inside the volute, or only one? • Trace the fluid path from suction to discharge: does liquid enter the impeller from one side only, or from two opposite sides toward the center? • Examine the impeller itself: are the vanes sandwiched between side plates (shrouds), or can you see bare vanes exposed to the casing on one side?

✅ Before You Answer

• Confirm the number of impellers/stages visible in the cross‑section before deciding between single‑stage and multistage. • Check how many suction openings/eyes feed the impeller to choose between single suction and double suction. • Inspect whether the impeller has solid side plates on both sides (closed) or exposed vanes (open) before picking between open and closed impeller options.