Process Equipment and Plant Design
Stage efficiency for packed tower varies with the

All of these
Type & size of packing
Operating pressure and column diameter
Fluid rates and fluid properties

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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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