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# HW 7 - P11.74 The 32-in pump in Fig 117 is used at 1170...

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Unformatted text preview: P11.74 The 32-in pump in Fig. 117:: is used at 1170 r/min in “(a system whose head curve is H, (ft) = 100 + 1.5Q2, - with Q in thousands of gallons of water per minute. Find the discharge and brake horsepower required for (a) one pump, (b) two pumps in parallel, and (c) two pumps in series. Which conﬁguration is best? P11.75 Two 35-in pumps from Fig. 11.7b are installed in par- 1 allel for the system of Fig. P11.75. Neglect minor losses. [—7 7 For water at 20°C, estimate the ﬂow rate and power required if (a) both pumps are running and (b) one pump is shut off and isolated. 2,. 1 statute mile of cast iron pipe. 24—in diameter . 21:2(Xlﬂ Two pumps P11.75 P11.76 Two 32—in pumps from Fig. 11.70 are combined in par- allel to deliver water at 60°F through 1500 ft of hori- zontal pipe. If f 2 0.025, what pipe diameter will ensure a ﬂow rate of 35.000 gal/min for n = 1170 r/min? Cll.1 The net head of a little aquarium pump is . ‘ ~ . given by the manufacturer as a tunction of volume ﬂow rate as listed below: —._.__.__ Q. 1113/5 H. an30 M 0 1.10 1.0 13-6 1.00 2.0 15—6 0.80 3.0 13-6 0.60 4.0 E~6 0.35 5.0 E»() 0.0 W What is the maximum achievable ﬂow rate if you use this pump to move water from the lower reservoir to the upper reservorr as shown in Fig. Cl 1 . 1? Note: The tubinu lS smooth with an inner diameter of 5.0 mm and a total length of 29.8 m. The water is at room temperature and pressure. Minor losses in the system can be neglected. Cl.1.1 ...
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