For the system presented in Example 21. 3 you are asked to appraise the effects of adding a second pump and impeller set identical to the current pump in the system.

a. Prepare a performance diagram, for the two-pump system and for each impeller size, if the pumps are to be installed in series.

b. Prepare a performance diagram, for the two-pump system and for each impeller size, if the pumps are to be installed in parallel.

c. Estimate the pressure achieved for each pump/impeller system in Parts

(a) and

(b) at flowrates of 400 and 800 gallons \(/ \mathrm{min}\).

Data from example 21.3

Transcribed Image Text:

The centrifugal pump shown in Figure 21.4 is used to supply water to a storage tank. The pump inlet is at atmospheric pressure and water is pumped up to the storage tank, which is open to atmosphere. via large-diameter pipes. Because the pipe diameters are large, the frictional losses in the pipes and any change in fluid velocity can be safely ignored.