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Process Equipment and Plant Design

Process Equipment and Plant Design
Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around

0.35-0.75
0.4-0.6
0.1-0.2
0.55-0.85

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Process Equipment and Plant Design
The longitudinal stress induced in a thin walled cylinderical vessel under internal pressure is

pd/2t
pd/4t
pd/t
pd/8t

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Process Equipment and Plant Design
A rivetted joint does not fail by __________ of rivets.

Tearing
Shearing
Tearing of the plate across a row
None of these

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Process Equipment and Plant Design
Tube height in a calendria type evaporator is normally less than __________ metres.

2
1
3.5
5.5

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Process Equipment and Plant Design
Stage efficiency for packed tower varies with the

Fluid rates and fluid properties
Type & size of packing
Operating pressure and column diameter
All of these

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

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

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