In the design of a shell and tube heat exchanger, the corrosion allowance ____________________?

A. Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc.

B. For carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe

C. ditions it is 3 mm

D. For internal cover and tube sheet is provided on both the sides

E. All A., B. & C.

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