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
For internal cover and tube sheet is provided on both the sides
Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc
All of these

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Process Equipment and Plant Design
Bubble cap tray is the most commonly used tray in large distillation column, because

Of its flexibility and nearly constant efficiency under varying conditions of operation
None of these
It eliminates the foaming and entrain-ment tendency during operation
It incurs less pressure drop as compared to any other try designed for the same duty

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