Two reservoirs are connected by a 300-m-long asphalt-lined, cast iron pipeline, 40 cm in diameter. The...

  

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Two reservoirs are connected by a 300-m-long asphalt-lined, cast iron pipeline, 40 cm in diameter. The minor losses include the entrance, the exit, and a gate valve. The elevation difference between the reservoirs is 10 m and the water temperature is 10°C. Determine the discharge, head, and the efficiency using (a) one pump, (b) two pumps in series, and (c) two pumps in parallel. Use the pump with characteristics depicted in Figure 5.13. H = H₂ + SH (s = 1 + D Q (l/sec) 0 100 300 500 700 + ΣΚ V (m/sec) -=10+ (750f +1.65) 2g NR f 0 0.80 2.44 x 105 0.0175 2.39 7.30 x 105 0.0160 3.98 1.22 106 0.0155 5.57 1.70 x 106 0.0155 2g H (m) SH 10.0 10.5 14.0 20.7 31.0 Do not forget to convert Q values to m³/s in calculations K values: Entrance = 0.5; exit = 1.0; gate valve = 0.15 Use kinematic viscosity of 1.31 x 106 m²/s; e = 0.12 mm (Table 3.1) 13 Two reservoirs are connected by a 300-m-long asphalt-lined, cast iron pipeline, 40 cm in diameter. The minor losses include the entrance, the exit, and a gate valve. The elevation difference between the reservoirs is 10 m and the water temperature is 10°C. Determine the discharge, head, and the efficiency using (a) one pump, (b) two pumps in series, and (c) two pumps in parallel. Use the pump with characteristics depicted in Figure 5.13. H = H₂ + SH (s = 1 + D Q (l/sec) 0 100 300 500 700 + ΣΚ V (m/sec) -=10+ (750f +1.65) 2g NR f 0 0.80 2.44 x 105 0.0175 2.39 7.30 x 105 0.0160 3.98 1.22 106 0.0155 5.57 1.70 x 106 0.0155 2g H (m) SH 10.0 10.5 14.0 20.7 31.0 Do not forget to convert Q values to m³/s in calculations K values: Entrance = 0.5; exit = 1.0; gate valve = 0.15 Use kinematic viscosity of 1.31 x 106 m²/s; e = 0.12 mm (Table 3.1) 13

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