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Process Equipment and Plant Design

Process Equipment and Plant Design
Value of Peclet number = ∞, is the representative of

Eddy diffusivity = 0
Plug flow
Complete back mixing
Laminar flow

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Process Equipment and Plant Design
In a shell and tube heat exchanger, the shortest centre to centre distance between the adjacent tubes is

None of these
Always less than the diameter of the tube
Called tube clearance
Called tube pitch

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Process Equipment and Plant Design
The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called

None of these
Static submergence
Skirt clearance
Downcomer liquid seal

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Process Equipment and Plant Design
Spherical shaped pressure vessel is considered to be the most ideal, because it can

Be fabricated very easily
Be designed without wind load considerations
Be supported very easily
Withstand higher pressure for a given metallic shell thickness

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

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

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Process Equipment and Plant Design
Welded joint efficiency in the design of chemical process equipment is taken as

0.55
0.75
0.85
0.95

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