Paralel-connected double centrifugal pumps each have a specific speed of 28 and operate at 1350 rpm while delivering water with outlet velocity of flow of 3 mv's and ‘performing 82% manometric cfficicacy. The impeller outer diameter and blade angle at outlet are 0.25 m and 25 to the tangent respectively. The double pumps are replaced by series-connected four centifugal pumps 1o meet the same duty (same head and flow rate) with a specific speed of 30 for each pump. The outer diameter of the impeller s 0.5 m and passage width is 0.03 m. At exit the blades are backward curved and making an angle of 14° with tangent. Draw the velocity diagrams at nlet and outlet. Determine the manometric efficiency of each pump for the in series- connected pump system? Parallel-connected double centrifugal pumps each have a specific speed of 28 andoperate at 1350 rpm while delivering water with outlet velocity of flow of 3 m's andperforming 82% manometric efficiency. The impeller outer diameter and bladeangle at outlet are 0.25 m and 25° to the tangent respectively. The double pumps arereplaced by series-connected four centrifugal pumps to meet the same duty (samehead and flow rate) with a specific speed of 30 for each pump. The outer diameterof the impeller is 0.5 m and passage width is 0.03 m. At exit, the blades are backwardcurved and making an angle of 14° with tangent. Draw the velocity diagrams at inletand outlet. Determine the manometric efficiency of each pump for the in series-connected pump system?

Velocity diagram at the inlet and outlet of a centrifugal pump,

Answered: Parallel-connected double centrifugal…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Paralel-connected double centrifugal pumps each have a specific speed of 28 and operate at 1350 rpm while delivering water with outlet velocity of flow of 3 mv's and ‘performing 82% manometric cfficicacy. The impeller outer diameter and blade angle at outlet are 0.25 m and 25 to the tangent respectively. The double pumps are replaced by series-connected four centifugal pumps 1o meet the same duty (same head and flow rate) with a specific speed of 30 for each pump. The outer diameter of the impeller s 0.5 m and passage width is 0.03 m. At exit the blades are backward curved and making an angle of 14° with tangent. Draw the velocity diagrams at nlet and outlet. Determine the manometric efficiency of each pump for the in series- connected pump system?

Parallel-connected double centrifugal pumps each have a specific speed of 28 and
operate at 1350 rpm while delivering water with outlet velocity of flow of 3 m's and
performing 82% manometric efficiency. The impeller outer diameter and blade
angle at outlet are 0.25 m and 25° to the tangent respectively. The double pumps are
replaced by series-connected four centrifugal pumps to meet the same duty (same
head and flow rate) with a specific speed of 30 for each pump. The outer diameter
of the impeller is 0.5 m and passage width is 0.03 m. At exit, the blades are backward
curved and making an angle of 14° with tangent. Draw the velocity diagrams at inlet
and outlet. Determine the manometric efficiency of each pump for the in series-
connected pump system?

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