A pump is located 2 m below the water surface in a reservoir as shown in Figure 8.47. The piping between the pump and the reservoir consists of 3 m of 150-mm-diameter ductile iron pipe (DIP).It is...

A pump is located 2 m below the water surface in a reservoir as shown in Figure 8.47. The piping between the pump and the reservoir consists of 3 m of 150-mm-diameter ductile iron pipe (DIP).It is estimated that the DIP has an equivalent sand roughness of 0.25 mm. The valves and bends between the source reservoir and the pump are estimated to have a total local loss coefficient of 50. Under design conditions, the water in the reservoir has a temperature of 25◦C and the atmospheric pressure is 101.3 kPa. The pump specifications require that the pump have a minimum net positive suction head of 4 m. What is the maximum allowable flow rate through the system so as to avoid cavitation?