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 conditions it is 3 mm
(C) For internal cover and tube sheet is provided on both the sides
(D) All
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