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Determine the available NPSH for the system shown in Fig. 13.38 (b). The fluid is water a and the atmospheric pressure is 101.8 kPa. The water level in the tank is 2.0 m below the nlet. The vertical leg of the suction line is a DN 80 Schedule 40 steel pipe, whereas the horizontal leg is a DN 50 Schedule 40 pipe, 1.5 m long. The elbow is of the long-radius ty Neglect the loss in the reducer. The foot valve and strainer are of the hingeddisk type. Th rate is 300 L/min. FIGURE 13.38 Pump suction-line details and definitions of terms for computing NPSH. h, = Tank pressure head

Determine the available NPSH for the system shown in Fig. 13.38 (b). The fluid is water a and the atmospheric pressure is 101.8 kPa. The water level in the tank is 2.0 m below the nlet. The vertical leg of the suction line is a DN 80 Schedule 40 steel pipe, whereas the horizontal leg is a DN 50 Schedule 40 pipe, 1.5 m long. The elbow is of the long-radius ty Neglect the loss in the reducer. The foot valve and strainer are of the hingeddisk type. Th rate is 300 L/min. FIGURE 13.38 Pump suction-line details and definitions of terms for computing NPSH. h, = Tank pressure head

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Determine the available NPSH for the system shown in Fig. 13.38 (b). The fluid is water at 80°C and the atmospheric pressure is 101.8 kPa. The water level in the tank is 2.0 m below the pump inlet. The vertical leg of the suction line is a DN 80 Schedule 40 steel pipe, whereas the horizontal leg is a DN 50 Schedule 40 pipe, 1.5 m long. The elbow is of the long-radius type. Neglect the loss in the reducer. The foot valve and strainer are of the hingeddisk type. The flow rate is 300 L/min. FIGURE 13.38 Pump suction-line details and definitions of terms for computing NPSH. h= Tank pressure head h, due to losses in suction line Discharge line Liquid with vapor pressure head h. Flow Suction line Discharge line Eccentric reducer = atmospheric pressure head with tank open Liquid with vapor pressure head h. Flow h, due to pipe friction, two elbows, valve, entrance Foot valve with strainer (a) (b)
Transcribed Image Text:Determine the available NPSH for the system shown in Fig. 13.38 (b). The fluid is water at 80°C and the atmospheric pressure is 101.8 kPa. The water level in the tank is 2.0 m below the pump inlet. The vertical leg of the suction line is a DN 80 Schedule 40 steel pipe, whereas the horizontal leg is a DN 50 Schedule 40 pipe, 1.5 m long. The elbow is of the long-radius type. Neglect the loss in the reducer. The foot valve and strainer are of the hingeddisk type. The flow rate is 300 L/min. FIGURE 13.38 Pump suction-line details and definitions of terms for computing NPSH. h= Tank pressure head h, due to losses in suction line Discharge line Liquid with vapor pressure head h. Flow Suction line Discharge line Eccentric reducer = atmospheric pressure head with tank open Liquid with vapor pressure head h. Flow h, due to pipe friction, two elbows, valve, entrance Foot valve with strainer (a) (b)
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