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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/4t
pd/t
pd/2t

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Process Equipment and Plant Design
With increase in temperature drop (in a shell and tube heat exchanger), the LMTD correction factor, FT

Increases very rapidly
Increases linearly
Remains constant
Decreases very rapidly

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Process Equipment and Plant Design
Le/D for fully open gate valves would be

Much less (say 2% than that for fully open globe valves)
Both B and C
Around 7
Much more than that for fully open globe valves

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Process Equipment and Plant Design
Le/D for 90° elbow (medium radius) and 90°square elbow would be respectively around

25 and 60
100 and 250
250 and 600
3 and 5

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Process Equipment and Plant Design
The stress developed in a material without any permanent set is called the

Elastic limit
Breaking stress
Yield stress
Ultimate stress

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Process Equipment and Plant Design
Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is

More
More or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein
Less
Same

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