Q. 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 of the above