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### PPT ON MINIMUM SPEED OF PUMP.pptx

1. KALI CHARAN NIGAM INSTITUTE OF TECHNOLOGY, BANDA LECTURE ON CENTRIFUGAL PUMP TOPIC – MINIMUM SPEED FOR STARTING A CENTRIFUGAL PUMP FLUID MECHANICS AND FLUID MACHINE (KME302) BY : DEEPAK KUMAR YADAV ME DEPARTMENT
2. MINIMUM SPEED FOR STARTING A CENTRIFUGAL PUMP  If the pressure rise in the impeller is more than or equal to manometric head (Hm), the centrifugal pump will start delivering water. Otherwise, the pump will not discharge any water, though the impeller is rotating. When impeller is rotating, the water in contact with the impeller is also rotating, this is case of force vortex.
3. MINIMUM SPEED FOR STARTING A CENTRIFUGAL PUMP  In case of forced vortex, the centrifugal head or head due to pressure rise in the impeller = Head due to pressure rise in impeller =  The flow of water will commence only if Head due to pressure rise in impeller
4. MINIMUM SPEED FOR STARTING A CENTRIFUGAL PUMP For minimum speed, we must have ….(i) Substituting this value in equation (i)
5. MINIMUM SPEED FOR STARTING A CENTRIFUGAL PUMP Substituting the value of and Dividing by
6. NUMERICAL PROBLEM 1: The diameter of an impeller of a centrifugal pump at inlet and outlet are 30cm and 60cm respectively. Determine the minimum speed starting speed of the pump if it works against a head of 30m. [AKTU 2016-17] SOLUTION: Diameter of impeller at inlet, Diameter of impeller at outlet, Head, Hm = 30m Let the minimum starting speed = N
7. NUMERICAL where
8. NUMERICAL PROBLEM 2: The diameter of an impeller of a centrifugal pump at inlet and outlet are 30cm and 60cm respectively. The velocity of flow at outlet is 2m/s and the vanes are set back an angle of 45o the outlet. Determine the minimum speed of the pump if the manometric efficiency if 70%. SOLUTION :
9. NUMERICAL  Let the minimum speed starting speed = N
10. NUMERICAL • Put all given values on minimum speed equation, we get
11. THANK YOU
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