Process Equipment and Plant Design
A certain pressure vessel manufacturer avoids doing reinforcements calculations for openings by always providing a reinforcing pad extending upto double the diameter of the opening and of the same material and thickness as that of the shell wall. If area compensation is accepted as a code guideline, his approach leads to safe design

Only if the opening is on spherical vessel
Only if the opening is on a horizontal cylinderical vessel
Only if the opening is on a vertical cylinderical vessel
Irrespective of the shape of the vessel

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of the bubble cap tray of a distillation column to give stable operation and even vapour distribution.

None of these
The dimensionless ratio of liquid gradient to pressure drop head caused by the bubble cap assembly should be less than 0.4
The pressure drop due to the caps & slots and the static submergence should be as high as practicable for reasonable operation
Tendency towards stable operation is increased by increasing the skirt clearance of the caps, lowering the rate of liquid flow per unit plate width or increasing the spacing between the caps

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