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Process Equipment and Plant Design

Process Equipment and Plant Design
Back-trapping in a distillation column results due to

Excessive liquid gradient over the tray
High gas velocity
Low reflux ratio
Low gas velocity

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Process Equipment and Plant Design
Bubble cap diameter used for the distillation column having diameter ranging from 1.5 to 4.5 metres is about __________ mm.

50
10
150
100

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Process Equipment and Plant Design
In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of __________ mm.

43895
44058
44183
43962

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Process Equipment and Plant Design
It is not desirable to design a heat exchanger for LMTD correction factor, FT, of less than

0.95
0.99
0.55
0.8

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Process Equipment and Plant Design
Ratio of tube length to shell diameter for a shell and tube heat exchanger is

< 4 : 1 for gas-gas exchangers
Both B & C
8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers
4 : 1 to 8 : 1 for liquid-liquid exchanger

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Process Equipment and Plant Design
Heat transfer co-efficient, hG(Kcal/hr.m² .°C) and mass velocity of air, G (kg/hr.m² ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to

1.004G0.8
0.0176G1.37
HG = 1.004G0.37
HG = 0.0176G0.37

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