Process Equipment and Plant Design
Generally, elliptical dished heads

Are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for pressure vessels operating above a pressure of 1.5 MN/m²
Resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter
All of these
Are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D

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

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

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