How many impellers are required for a multi-stage pump to lift 4000 lpm against a total head of 80 m at a speed of 750 rpm; given that Ns for each impeller should be between 720 to 780 units?

How many impellers are required for a multi-stage pump to lift 4000 lp

1.	How many impellers are required for a multi-stage pump to lift 4000 lpm against a total head of 80 m at a speed of 750 rpm; given that Ns for each impeller should be between 720 to 780 units?
A.	6
B.	5
C.	4
D.	3
Answer» C. 4

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How many impellers are required for a multi-stage pump to lift 4000 lpm against a total head of 80 m at a speed of 750 rpm; given that Ns for each impeller should be between 720 to 780 units?

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