CHAPTER 6
VELOCIS SOLUTIONS @2018
8
Figure 7.6: Performance curve for a range of impeller sizes
a) 250 mm b) 225 mm c) 200 mm d) 175 mm e) 150 mm
Figure 7.7 indicates head, power, efficiency and NPSH plots against flow rate. Notice how the
efficiency line curves and reverses itself. For a certain wheel diameter there are two combinations
of head and capacity that possess the same efficiency.
Figure 7.7 depicts a characteristic curve for a typical pump with N
s
(specific speed) ≈ 40
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