Problem 11.44
The pump of Prob. 11.28 is scaled up to an 18-in-diameter, operating in water at best efficiency
at 1760 rpm. The measured NPSH is 16 ft, and the friction loss between the inlet and the pump is
22 ft. Will it be sufficient to avoid cavitation if the pump inlet is placed 9 ft below the surface of
a sea-level reservoir?
Problem 11.28
Tests by the Byron Jackson Co. of a 14.62-in-diameter centrifugal water pump at 2134 rpm yield
the following data.
Q, ft3/s:
0
2
4
6
8
10
H, ft:
340
340
340
330
300
220
bhp:
135
160
205
255
330
330
What is the BEP? What is the specific speed? Estimate the maximum discharge possible.