Water is to be pumped from lake to a second large, close tank with inside pressure of 0.9 bar as shown in figure 1 below. The pipe diameter throughout is 5 cm. and the total length of the pipe between the pipe entrance and exit is 40 m. Minor loss coefficients for the entrance, exit, and the elbow are shown on the figure, and the friction factor for the pipe can be assumed constant and equal to 0.02. A certain centrifugal pump having the performance characteristics shown in Figure

1. With the pump with 329 diameter, what would be the flowrate, head and efficiency? 2. If we use two pumps with series connecting, what would be the flowrate, head and efficiency? 3. If we use two pumps with parallel connecting, what would be the flowrate, head and efficiency? 4. If the water temperature is 50C and atmospheric pressure is 1 bar, determine the maximum height, z1, that the pump can be located above the water surface without cavitation.

(2) Water K = 1.0 K = 1.5 40 m Pump z1 (1) Kl = 0.5 Typical Pump Performance Curve 30% 40% 50% 55% 50% 55% 60% 329 150 321 I 63% 140 315 66% 130 300 g 64% 120 285 g 63% TOTAL HEAD-METRES -H 110 60% X62% 270 100 55% X 60% 255 g 90 X58% 80 -> MIN. FLOW (FOR BY-PAR% -> MIN. SAFE FLOW AS PER API-610 70 25 50 75 100 125 150 175 z 100 CAUTION- C.L.impeller suitable up to 264 nam only, 329 3150 INPUT IN KW-N 50 300 2858 270 0 255 0 O 25 50 75 100 125 150 175 70 60 329 0 50 40 EFFICIENCY %-12 REQUIRED NPSH-M 30 7.5 329 0-255 20 5 10 2.5 0 175 ADD 0.5m TO THIS NPSH TEST CURVE FOR ALL FIELD APPLICATION. 0 0 25 50 75 100 125 150 DISCHARGE Q - m3/hr RECOMMENDED DELIVERY PIPE SIZE mm 80 100 125 150 175 RECOMMENDED SUCTION PIPE SIZE mm 100 125 150 175