Problem 1. A feed rate of 200 gpm of a hydrocarbon mixture at 70°C is being pumped from a tank at 1 atm abs pressure to a distillation tower. The density of the feed is 46.8 lbm/ft³ and its vapor pressure is 8.45 psia. The velocity in the inlet line to the pump is 3 ft/s and the friction loss in the suction line is 3.5 ft. The net positive suction head required is 6 ft. (a) Find the available net positive suction head if the pump is at the same level as the surface of liquid in the reservoir. (b) What is the maximum height of the pump relative to the level of the tank before cavitation becomes likely?

1. Consider a 1000 MW power plant located in a rural area with 15 ton/day SO2 emissions from a 100 m high stack. The velocity and temperature of the stack gases lead to an effective stack height of 50 m above the physical stack. Estimate the ground level concentration as a function of distance downwind under the following conditions. The emissions are into a clear daytime atmosphere with wind (at 10 m) of 5 m/s. b. The emissions are into a clear nighttime atmosphere with wind (at 10 m) of 2 m/s. The conditions of a. except there is a strong elevated inversion at an altitude of 200 m. a. С.

Question 2 A water pump driven by an 800 W electric motor is used to pump water from the ground level to a tank at the rate of 20000 L/hour. Water is being discharged into the tank at 10 meters above the ground; this is the maximum rise this pump can achieve. The water and the ambient temperatures are both 10 °C. The inlet and outlet pipe diameters for the pump are both 8 cm, respectively. Determine: (1)/ The average inlet linear flow velocity of the water; 2) Assuming the efficiency of the electric motor is 95%, calculate the efficieney-of the motor-pump unit; 3) The pressure difference between the inlet and the outlet of the pump.