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Process Equipment and Plant Design

Process Equipment and Plant Design
Minimum baffle spacing recommended in a shell and tube heat exchanger is equal to

I.D. of the shell
40% of the I.D. of the shell
5 cms
25 cms

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

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

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Process Equipment and Plant Design
In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the

Lower skirt clearance
Lower static submergence
Liquid gradient on the tray
Small downcomer liquid seal

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Process Equipment and Plant Design
Wind load consideration in the design of a support can be neglected, when the vessel is

Tall but empty
Short (< 2 m) and housed indoor
Tall (say 30 metres), but is full of liquid
None of these

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Process Equipment and Plant Design
Le/D for a Tee (used as elbow, entering run) would be around

200
5
60
350

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Process Equipment and Plant Design
__________ closure is the weakest enclosure for cylindrical vessels.

Elliptical
Conical or flat plate
Hemispherical
Torispherical

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