Process Equipment and Plant Design Questions

• Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 - 1.4 cp and relative volatility < 4) (where η = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi)
• Smaller sized packings are generally dumped to the packed columns, and the large ones of size greater than __________ mm are stacked individually, which provides better control over bed porosity and offers lower gas pressure drop.
• Fresh water carrying pipelines in chemical industries are coloured with __________ color.
• 25 per cent cut segmental baffle means that the baffle
• The ratio of shear stress to shear strain is called
• Pick out the wrong statement pertaining to the use of valve tray, seive tray and bubble cap trays in continuous distillation column.
• Correct use of 'factor of safety' is very important in equipment design. It is defined as the ratio of the
• Pick out the wrong statement pertaining to the design of the bubble cap tray of a distillation column to give stable operation and even vapour distribution.
• It is not desirable to design a heat exchanger for LMTD correction factor, FT, of less than
• Bracket supports are the most suitable for supporting __________ vessels.
• Holes of a sieve tray are arranged in triangular pitch of __________ times the hole diameter.
• Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?
• In a heat exchanger, shell side fluid velocity can be changed by changing the tube
• For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by
• Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent.
• In perforated plate towers, the
• A rivetted joint does not fail by __________ of rivets.
• for fully open globe value may be around
• The ends of a cylinderical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure.
• In case of bubble cap distillation column of diameter greater than 1.2 metres, the cap diameter is roughly about __________ cms.