🔍 Key Concepts

• Direction of flow through the impeller (is it mostly radial, axial, or a combination/mixed?) • Whether the impeller eye is on one side or both sides of the hub (single vs double suction) • Whether the impeller vanes are fully enclosed between shrouds (closed) or partly open (semi-open)

💭 Think About

• Look closely at the impeller drawing: Do you see shrouds (cover plates) on one or both sides of the vanes, or are the vanes exposed on one side? • From the cutaway, does liquid enter the impeller from one side only or from both sides toward the center? • Does the flow path appear to go straight through along the shaft (axial), straight outward (radial), or a combination that curves from axial to radial (mixed)?

✅ Before You Answer

• Verify whether the impeller has one suction eye or two. • Confirm if the impeller has solid covers on both sides of the vanes (closed) or if one side is open (semi‑open). • Decide whether the main flow pattern is axial, radial, or mixed, based on how the liquid moves from the suction into the volute.