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

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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
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
The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns

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Process Equipment and Plant Design
In the design of a shell and tube heat exchanger, the corrosion allowance

For internal cover and tube sheet is provided on both the sides
All of these
For carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe conditions it is 3 mm
Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to a shell and tube heat exchanger.

The maximum value of baffle spacing is equal to the I.D. of the shell
Disk and doughnut baffle is the most commonly used baffle
The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these
The minimum value of baffle spacing is 50 mm

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