1. It is proposed to pump 10,000 kg/h of toluene at 114 °C and 1.1 atm absolute pressure from the reboiler of a distillation tower to a second distillation unit without cooling the toluene before it enters the pump. If the frictional loss in the line between the reboiler and pump is 7 kN/m2 and the density of toluene is 866 kg/m3 , how far above the pump must the liquid level in the reboiler be maintained to give a net positive suction head of 2.5 m? The answer should be: 3.22 m
1. It is proposed to pump 10,000 kg/h of toluene at 114 °C and 1.1 atm absolute pressure from the reboiler of a distillation tower to a second distillation unit without cooling the toluene before it enters the pump. If the frictional loss in the line between the reboiler and pump is 7 kN/m2 and the density of toluene is 866 kg/m3 , how far above the pump must the liquid level in the reboiler be maintained to give a net positive suction head of 2.5 m? The answer should be: 3.22 m 2. 2.A pump moves hot water condensate from a tank under vacuum (T = 180°F and p = ‐9.8 psig) to a vented tank at an elevation 40 ft above the pump. The condensate level is 5 ft above the pump inlet, the vapor pressure of the condensate is 7 psia, and the head loss in the suction line is 2.3 ft. If the minimum required NPSH is 9 ft, will the pump cavitate?
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