You have to select a pump to transfer benzene from the reboiler of a distillation column to a storage tank at a rate of 250 gpm. The reboiler pressure is 15 psig and the temperature is 608C. The tank...

You have to select a pump to transfer benzene from the reboiler of a distillation column to a storage tank at a rate of 250 gpm. The reboiler pressure is 15 psig and the temperature is 608C. The tank is 5 ft higher than the reboiler and is at a pressure of 25 psig. The total length of piping is 140 ft of 2 in. sch 40 pipe. The discharge line from the pump contains three gate valves and 10 elbows, and the suction line has two gate valves and six elbows. The vapor pressure of benzene at 608C is 400 mmHg.

(a) Using the pump curves shown in Fig. 8-2, determine the impeller diameter to use in the pump, the head that the pump would develop, the power of the motor required to drive the pump, and the NPSH required for the pump.

(b) If the pump is on the same level as the reboiler, how far from the reboiler could it be located without cavitating?