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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 67
1000 2000 3000 40000
10
20
30
Pipe size in inches
Pump speed rpm
Low-suction
energy pumps
High-suction
energy pumps
N
s
s
1
2
5
0
1
a
b
o
ve
N
s
s
8
5
0
1
1
0
5
0
0
N
s
s
b
e
l
o
w
8
5
0
1
N
ss
10501–12500
Figure 3.15
Flow rate chart
Thus, we see that NPSH-r as per Hydraulic Institute’s definition of 3% head drop is not
an indicator of inception of cavitation and consequent pump damage.
It then becomes necessary to come up with a theoretical NPSH-r that can indicate the
inception of cavitation that can then ensure a cavitation-free operation.
The theoretical derivation of NPSH-r or ‘Cavitation-Free NPSH’ is based on factors
such as:
Head loss due to f
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Publisher Resources

ISBN: 9780080480145