In the design of a shell and tube heat exchanger, the corrosion allowance ____________________?
Correct answer: A. All A., B. & C.
- A. All A., B. & C.
- B. For carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe
- C. conditions it is 3 mm
- D. For internal cover and tube sheet is provided on both the sides
- E. Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc.
Explanation
The listed practices are standard corrosion-allowance rules: non-pressure attachments may be exempt, carbon-steel and cast-iron pressure parts commonly use 1.5 mm or 3 mm for severe service, and relevant cover or tubesheet surfaces may require allowance on both sides. Thus the combined option applies.
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