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Centrifugal pump specific speed classification: Ns = 160 to 500 (rpm-based form) Interpret the flow direction at outlet associated with this specific speed band. Choose the most suitable description.

Difficulty: Easy

Correct Answer: High speed with axial flow at outlet

Explanation:

Concept/Approach

  • Specific speed (rpm form) classifies pumps by type: low Ns → radial-flow; intermediate Ns → mixed-flow; high Ns → axial-flow.

ReasoningA value in the range of 160–500 rpm indicates high specific speed behavior trending toward axial-flow characteristics, used for high discharge and low head duties.

Final AnswerHigh speed with axial flow at outlet.

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