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Process Equipment and Plant Design

Process Equipment and Plant Design
The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from

4 to 8
6 to 12
2 to 3
3 to 5

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Process Equipment and Plant Design
In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D₁ and D₂ are I.D. of inner and outer pipes)

(D₂² - D₁²)/D₁²
D₂ - D₁
None of these
(D₂² - D₁²)/D₂²

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Process Equipment and Plant Design
The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the

Equal sized reactors are the best
Smaller reactor should come first
Larger reactor should come first
None of these

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Process Equipment and Plant Design
In condenser, the cooling water is passed in the tube side in a pass arrangement, because

Pressure drop is reduced
It makes condenser compact
More thinner tubes can be used
It reduces heat transfer area

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Process Equipment and Plant Design
The approximate liquid depth in an agitation tank is equal to (where, d = tank diameter)

D
2 d
0.5 d
0.75 d

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Process Equipment and Plant Design
Accidents in chemical plants are mostly due to

Failure of equipments
Improper layout of the equipments
Faulty operating procedures
Inadequate equipment design

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