process equipment design
DEPARTMENT OF CHEMICAL ENGINEERING
Indian Institute of Technology Madras Chennai – 600 036
CH 3080 Process Equipment Design
Problem set – IA
1. Crude oil, specific gravity of 0.887, flows through the piping shown in Figure. Pipe A is 50-mm Schedule 40, pipe B is 75 mm Schedule 40, and each of pipes C is 38-mm Schedule 40. An equal quantity of liquid flows through each of the pipes C. The flow through pipe A is 6.65 m3/h. Calculate (a) the mass flow rate in each pipe, (b) the average linear velocity in each pipe and (c) the mass velocity n each pipe. (d) What capacity and type of pump do you recommend? (e) How do you join the pipes and present the mechanical design of all the joints shown in the figure.
2. A certain set of crushing rolls of 40 in. diameter by 15 in. width of face are set so that the crushing surfaces are 0.5 in. apart at the narrowest point. The manufacturer recommends that they be run 50 t0 100 rpm. They are to crush a rock having a specific gravity of 2.35, and the angle of nip is 30o. What are the maximum permissible size of feed and the maximum actual capacity in tons per hour, if the actual capacity is 12% of theoretical? After long use, the tires on the rolls of the mill have become roughened so that the angle of nip is 32030’. What will now be the maximum permissible size of feed, and the capacity? Specify the material of construction of rolls and present all the mechanical design of the crusher.
3. Crude oil at the rate of 150,000 kg/h is to be heated from 20 to 570 C by heat exchange with the bottom product from a distillation unit. The product at 129,000 kg/h is to be cooled from 146 to 1070 C. There is available a tubular exchanger with steel tubes with an inside shell diameter of 23 1/4 in., having one pass on the shell side and two passes on the tube side. It has 324 tubes, ¾ in. OD, BWG 14, 12 ft long arranged on a 1-in. square pitch and supported by baffles with a 25% cut, spaced at 9-in. intervals. Would
Indian Institute of Technology Madras Chennai – 600 036
CH 3080 Process Equipment Design
Problem set – IA
1. Crude oil, specific gravity of 0.887, flows through the piping shown in Figure. Pipe A is 50-mm Schedule 40, pipe B is 75 mm Schedule 40, and each of pipes C is 38-mm Schedule 40. An equal quantity of liquid flows through each of the pipes C. The flow through pipe A is 6.65 m3/h. Calculate (a) the mass flow rate in each pipe, (b) the average linear velocity in each pipe and (c) the mass velocity n each pipe. (d) What capacity and type of pump do you recommend? (e) How do you join the pipes and present the mechanical design of all the joints shown in the figure.
2. A certain set of crushing rolls of 40 in. diameter by 15 in. width of face are set so that the crushing surfaces are 0.5 in. apart at the narrowest point. The manufacturer recommends that they be run 50 t0 100 rpm. They are to crush a rock having a specific gravity of 2.35, and the angle of nip is 30o. What are the maximum permissible size of feed and the maximum actual capacity in tons per hour, if the actual capacity is 12% of theoretical? After long use, the tires on the rolls of the mill have become roughened so that the angle of nip is 32030’. What will now be the maximum permissible size of feed, and the capacity? Specify the material of construction of rolls and present all the mechanical design of the crusher.
3. Crude oil at the rate of 150,000 kg/h is to be heated from 20 to 570 C by heat exchange with the bottom product from a distillation unit. The product at 129,000 kg/h is to be cooled from 146 to 1070 C. There is available a tubular exchanger with steel tubes with an inside shell diameter of 23 1/4 in., having one pass on the shell side and two passes on the tube side. It has 324 tubes, ¾ in. OD, BWG 14, 12 ft long arranged on a 1-in. square pitch and supported by baffles with a 25% cut, spaced at 9-in. intervals. Would