Using the data from Problem 4-27 and its solution, plot the lower head-discharge curve [part (a)] and the upper head-discharge curve [part (b)]. Three identical constant-speed pumps are provided with one as a standby. The operating range of each pump is from 44 m and 181/s to 36 m and 36 lis with the best efficiency point (bep) at 40 m and 30 lis. With two pumps in operation, the range is from 44 in and 36 1/s to 36 m and 72 1/s with the bep at 40 m and 60 Vs. On the graph of head-discharge curves, plot pump curves for one and two pumps in operation. Draw a small circle around the operating points of the pumps on the head-discharge curves.
Problem 4-27:
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