Process Equipment and Plant Design Questions

• In a multipass shell and tube heat exchanger, the problem of differential expansion between the shell and tube passes is taken care of by using a
• In a vertical short tube evaporator (Calendria type), the
• Liquid redistribution should be done in a packed tower packed with raschig rings every 6 metres or __________ times the column diameter, whichever is lower.
• Maximum plate efficiency is achieved in case of __________ flow.
• Slope of countercurrent flow rotary drier is in the range of __________ meter/metre.
• __________ tower is the most suitable gas-liquid contacting device involving highly corrosive fluids.
• In case of plain carbon steel, butt welded joints are used for shell plate thickness ≤ __________ cms.
• Minimum tube pitch recommended for shell and tube heat exchangers is about __________ times the outside diameter of the tube.
• In distillation columns, bubble caps are held in place over trays by
• The normal range of velocity of water in pipes is __________ m/sec.
• for couplings and unions would be
• Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle?
• The longitudinal stress induced in a thin walled cylinderical vessel under internal pressure is
• In case of saddle packing (e.g., berl and intralox saddles), the maximum size of the packing should not exceed __________ of the column diameter.
• When one of the fluids is highly corrosive and has fouling tendency, it should
• What is the slope of the operating line in the rectifying section of a distillation coloumn?
• The length of straight rectangular weir used on cross-flow trays is generally __________ the column diameter.
• In a __________ rivetted joint, the number of rivets decreases from the innermost row to the outermost row.
• Any shell opening greater than 5 cms for a storage tank must be reinforced for reason of
• At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally.