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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
12
6
34

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Process Equipment and Plant Design
A claming section before the liquid flows into the downcomer is privided to

Cool the liquid before it flows down
Ensure better vapour-liquid contact
Reduce the discharge fluctuation
Permit release of entrained vapour in the liquid

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Process Equipment and Plant Design
For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by

Di, opt = 3.9 Q0.45 . ρ0.23
Di, opt = 7.6 Q0.36 . ρ0.9
Di, opt = 3 Q0.36 . ρ1.86 μ0.08
Di, opt = 3 Q0.36 ρ0.18

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Process Equipment and Plant Design
Normally, the length to diameter ratio of rotary dryers varies form 4 to 10 and for its economic operation, the number of transfer units (NTU) for such dryers varies from

3.5-5.5
44119
7.5-10.0
1.5-2.5

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Process Equipment and Plant Design
In case of a continuous distillation column, increase in reflux ratio may result in the

Lower fixed charges for the column
Greater cost for the reboiler heat supply
All of these
Greater cost for the condenser coolant

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Process Equipment and Plant Design
In perforated plate towers, the

Pressure drop is less compared is similar bubble cap towers
Total hole area may be around 6 to 15% of tower cross-sectional area
Hole sizes may be around 1/8" or 3/16"
All of these

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