Process Equipment and Plant Design Questions

• In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.
• For a cylinderical internally pressurised vessel, which of the following closure types would withstand highest pressure, if each closure is of the same material and thickness?
• Friction factor for turbulent flow in a new pipe is given by
• Of the pressure vessels, with same thickness but different diameters, which one withstands higher pressure?
• The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.
• In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer co-efficient (hi) vanishes after a Reynold number of
• Skirt support is the most suitable for supporting __________ vessels.
• Baffles may be eliminated for
• In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference
• Column support for the roof of cylindrical storage tank must be provided for
• Back-trapping in a distillation column results due to
• Pick out the wrong statement about the design of seive plate column and the bubble cap column.
• The wall thickness for a large high pressure pipeline is determined by the consideration of the
• The shell side pressure drop in a shell and tube heat exchanger is maximum for __________ baffle.
• Width and depth of grooves in the tube sheet holes normally are __________ inch respectively.
• For pipe flows, head is proportional to __________ at constant capacity (where D = pipe diameter ).
• For a cylinderical vessel of moderate height, the weld joint efficiency for joints parallel to the cylinderical axis is given as 1.0, while for joints along the girth (circumference) it is given as 0.8. In calculating the shell wall thickness using code formula for an internally pressurised cylinderical vessel, what value of weld joint efficiency should be used?
• Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is
• Diameter of bubble caps used in high pressure columns is __________ as compared to that used in identical vacuum columns.
• In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed __________ of the column diameter.