Process Equipment and Plant Design
In the design of a shell and tube heat exchanger, the corrosion allowance

Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc
For carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe conditions it is 3 mm
All of these
For internal cover and tube sheet is provided on both the sides

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Process Equipment and Plant Design
The LMTD correction factor (FT) is defined as the

Ratio of true temperature difference to the LMTD
Ratio of LMTD to the true temperature difference
Differenced of true temperature difference and the LMTD
Geometric mean of the true temperature difference and the LMTD

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