Process Equipment and Plant Design
The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called

None of these
Skirt clearance
Downcomer liquid seal
Static submergence

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

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

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