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
Are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D
All of these

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Process Equipment and Plant Design
Pick out the wrong statement about the design of seive plate column and the bubble cap column.

Weir length for a bubble cap plate is the same as that for the seive plate
The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns
Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate
Weir height for a bubble cap plate column is the same as that for a seive plate column

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