Acetone vapor in the distillate of T1102 is condensed and flows by gravity into tank V-1103. The stream is essentially pure acetone and flows at a rate of 340gal/min. Acetone has a density of 49lb/ft3 and a vapor pressure of 0.2ft of head. Tank V-1103 is a vertical tank, 2.5 feet in diameter and 10 feet tall. The liquid level in the tank is maintained at 5 feet. The liquid acetone is pumped from the bottom of the tank, up to the top of the column, 120 feet. The top of the column is at a pressure of 1.5atm. The total length of pipe, including all horizontal runs, is 180 feet and the line has 10 elbows and 1 valve in it. The system is shown below. You may assume the pressure drop for each elbow is 0.1psi and the pressure drop through the valve is 1.5psi. The performance curve for the pump is shown below. Your pump has a 12.2-inch impeller. g=32.2ft/s2;gc=32.2lbfft/bms2 i) Mark the performance of the pump on the pump curve and identify the pump efficiency, total supplied head, and NPSHR(5 points). ii) What size motor (HP) should you get (c.g., 10, 15, 20, 25, or 30 HP) (5 points)? iii) What is the NSPHA and is it greater than the required value? (5 points) iv) What is the total head the pump must provide, and will this pump provide it? If not, what specific modifications to the pump could be done? (10 points) Acetone vapor in the distillate of T1102 is condensed and flows by gravity into tank V-1103. The stream is essentially pure acetone and flows at a rate of 340gal/min. Acetone has a density of 49lb/ft3 and a vapor pressure of 0.2ft of head. Tank V-1103 is a vertical tank, 2.5 feet in diameter and 10 feet tall. The liquid level in the tank is maintained at 5 feet. The liquid acetone is pumped from the bottom of the tank, up to the top of the column, 120 feet. The top of the column is at a pressure of 1.5atm. The total length of pipe, including all horizontal runs, is 180 feet and the line has 10 elbows and 1 valve in it. The system is shown below. You may assume the pressure drop for each elbow is 0.1psi and the pressure drop through the valve is 1.5psi. The performance curve for the pump is shown below. Your pump has a 12.2-inch impeller. g=32.2ft/s2;gc=32.2lbfft/bms2 i) Mark the performance of the pump on the pump curve and identify the pump efficiency, total supplied head, and NPSHR(5 points). ii) What size motor (HP) should you get (c.g., 10, 15, 20, 25, or 30 HP) (5 points)? iii) What is the NSPHA and is it greater than the required value? (5 points) iv) What is the total head the pump must provide, and will this pump provide it? If not, what specific modifications to the pump could be done? (10 points)
