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

All of these
For internal cover and tube sheet is provided on both the sides
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
The centre to centre distance between two consecutive baffles in a shell and tube heat exchanger is called the baffle pitch or baffle spacing, which is more than 1/5th the I.D. of the shell. Which of the following is not a function of the baffles?

To increase the residence time of shell side fluid
To reduce the induced vibration in the tubes
To increase the tube side heat transfer co-efficient by inducing turbulence
To provide support to the tube bundle

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