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Process Equipment and Plant Design

Process Equipment and Plant Design
The minimum plate spacing in most of the pertroleum refinery distillation columns (of dia > 3 ft) is normally __________ inches.

18
6
12
34

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Process Equipment and Plant Design
Le/D for fully open gate valves would be

Both B and C
Much more than that for fully open globe valves
Much less (say 2% than that for fully open globe valves)
Around 7

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Process Equipment and Plant Design
In common bubble cap distillation column design practice, riser area is approximately equal to (where, Aa = Annular passage area, and Sa = Slot area)

1.2 Aa = 1.2 Sa
Aa = 1.5 Sa
Sa = 1.5 Aa
Aa = Sa

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Process Equipment and Plant Design
Baffles may be eliminated for

Low viscosity liquids (< 200 poise)
None of these
Large diameter tanks
High viscosity liquids (> 600 poise)

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Process Equipment and Plant Design
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?

Disk type baffle
Segmental baffle
Helical type baffle
Flat plate extending across the wall

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Process Equipment and Plant Design
Maximum size of the raschig rings used in a packed tower is about __________ of the coloumn diameter.

1/30th
1/20th
1/50th
1/10th

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