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Process Equipment and Plant Design

Process Equipment and Plant Design
A minimum clearance of about __________ mm is maintained between the distillation column wall and the bubble cap.

95
19
38
76

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Process Equipment and Plant Design
Larger depth of liquid on the trays of a distillation column

Neither A nor B
Results in higher pressure drop per tray
Both A & B
Leads to high tray efficiency

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Process Equipment and Plant Design
A high vapour velocity is required for high plate efficiency in a seive plate coloumn. The satisfactory value of operating vapor velocity for design purpose in seive plate column is about __________ percent of the flooding velocity.

60
45
80
95

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Process Equipment and Plant Design
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.

1/20-1/30th
1/5-1/10th
1/10-1/15th
1/2 to 1/4th

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Process Equipment and Plant Design
Pressure drop due to pipe fittings can be estimated by the equation, ΔP/p = 4f.Le/D.V2/2gc, where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of Le/D (dimensionless) for 45° elbow and 180° close return bends would be respectively around

180 and 300
45 and 75
5 and 10
300 and 500

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

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

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