Process Equipment and Plant Design
Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if

Plain carbon steel and cast iron parts are used
Material of construction is high alloy steel
Both B & C
Wall thickness is > 30 mm

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

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