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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
Pump hydraulics 59
3.11 Specific speed
Specific speed is a number characterizing the type of impeller in a unique and coherent
manner.
Specific speed is defined by the equation,
s
3/4
()
NQ
N
H
=
Where:
N = pump speed
Q = flow at BEP at maximum impeller diameter (no corrections even if it is a double
suction impeller)
H = head per stage at BEP at maximum impeller diameter
It states that N
s
is the speed in rpm at which a pump, if sufficiently reduced in size,
would deliver (in US units) 1 gpm at a head of 1 ft. This definition is of little practical
utility.
Specific speed is for an impeller, hence for multistage pumps only the first impeller ...
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Publisher Resources

ISBN: 9780080480145