Process Equipment and Plant Design
Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure?

None of these
At the inner surface
At the outer surface
At the mid thickness of the cylindrical wall

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Process Equipment and Plant Design
Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 - 1.4 cp and relative volatility < 4) (where η = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi)

Η = 17 - 61.1 log μ
Η = 24.6 (Δp/μ)
Η = 1.66 - 0.25 log μ
Η = 0.25 log μ - 1.67

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a long tube vertical evaporator.

Tube dia is 3-6 cms, while tube length in 3-6 metres
Steam is fed to the shell, whereas the liquor is filled inside the tube
None of these
Liquor level is maintained at l/3rd to 1/2 of the height of the tube

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