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Process Equipment and Plant Design

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

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

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Process Equipment and Plant Design
To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of

(1.2)2/3
(1.2)3/5
(1.2)5/3
(1.2)3/2

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Process Equipment and Plant Design
Tube wall thickness depends on the cor-rosiveness of the fluids and their operating pressure & temperature and is specified by Birmingham wire gauge (B.W.G)-a number which varies from 8 to 18 with the numbers 14 and 16 being more commonly used. Outside diameter of tubes varies from about 15 to 50 mm; however a tube of less than __________ mm outside diameter is generally not recommended for fouling fluids.

28
19
16
38

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Process Equipment and Plant Design
Hazards associated with the relief valve leakage for extremely hazardous material storage can be taken care of by providing

Surge chamber
Dikes
None of these
Rupture diaphragm

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Process Equipment and Plant Design
Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effect in evaporation

Does not affect the capacity
Increases economy
Both B & C
Increases capacity

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Process Equipment and Plant Design
LMTD correction factor is used in heat exchanger design for

Counter flow of hot and cold fluids
Multipass shell and tube heat exchanger
Double pipe heat exchanger
Fouling fluids

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