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?
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?
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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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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