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Practical Centrifugal Pumps
book

Practical Centrifugal Pumps

by Paresh Girdhar, Octo Moniz
April 2011
Beginner to intermediate content levelBeginner to intermediate
264 pages
8h 24m
English
Newnes
Content preview from Practical Centrifugal Pumps
228 Appendix A
1. The reduced impeller diameter, for the pump that operates unrestricted delivering
156 l/s @ 47.6 m head, is calculated using the formula
22
21 21 2 21 1
(/)= /or=(/)DD QQ D QQ D
×
Where
2
= unknown?,D
1
= 406 mm,D
1
= 156 l/s andQ
2
=140 l/sQ .
Therefore, D
2
= 384.6 mm.
To determine the head at which the pump will deliver 140 l/s with impeller size 384.6 mm,
join the operating point (140, 51.5) to the origin (0, 0). Now read off the ‘Y’ axis (H) at the
point where this line through the origin intersects the vertical line drawn through 140 l/s (Q)
on the ‘X’ axis – i.e. 42.5 m .
1. (a) Calculating power absorbed by the pump with ...
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Publisher Resources

ISBN: 9780080480145