Mechanical Engineering - Hydraulic Machines - Discussion


The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is

[A]. slow speed with radial flow at outlet
[B]. medium speed with radial flow at outlet
[C]. high speed with radial flow at outlet
[D]. high speed with axial flow at outlet

Answer: Option D


No answer description available for this question.

Harry said: (Apr 28, 2016)  
A centrifugal pump is impeller rotate outer periphery with high pressure and velocity, collected in the casing.

As the area increases gradually increase the casing is the direction of flow in the flow is axial.

Gaurav said: (Nov 15, 2019)  
How to know about speed and flow type at outlet from specific speed?

Prashant Mungase said: (Jan 3, 2020)  
The Classification of centrifugal pumps based on Specific speed:

Up to 80 - Radial flow pump (10-30=slow, 30-50=medium,50-80=high).
80 to 160 - Mixed flow pump.
160 to 500 - Axial flow pump.

Ref : Turbomachines by B.L.singhal.

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