Double suction pumps use which type of impellers?

Double suction pumps use which type of impellers?

• A. Closed
• B. Open
• C. Semi-Closed
• D. Double-Entry

Answer: (A)

Double-suction pumps draw flow from both sides of the impeller, which balances hydraulic forces and allows a higher flow while reducing axial loads on the bearings. In this arrangement, a closed impeller is preferred because it provides a fully enclosed flow path, preserving efficiency and strength under high-flow, dual-inlet conditions. The sealed design minimizes leakage and maintains a predictable, efficient flow pattern as liquid enters from both sides. Open impellers, while good for solids handling, introduce more leakage paths and lower efficiency in this context; semi-closed is a middle option but not the standard for this application. The term double-entry relates to the inlet arrangement rather than the impeller style, so it isn’t the impeller type used.

Double-suction pumps draw flow from both sides of the impeller, which balances hydraulic forces and allows a higher flow while reducing axial loads on the bearings. In this arrangement, a closed impeller is preferred because it provides a fully enclosed flow path, preserving efficiency and strength under high-flow, dual-inlet conditions. The sealed design minimizes leakage and maintains a predictable, efficient flow pattern as liquid enters from both sides. Open impellers, while good for solids handling, introduce more leakage paths and lower efficiency in this context; semi-closed is a middle option but not the standard for this application. The term double-entry relates to the inlet arrangement rather than the impeller style, so it isn’t the impeller type used.