Process Equipment and Plant Design
Le/D for a Tee (used as elbow, entering branch) would be

Around 90
More than that for Tee (used as elbow, entering run)
Less than that for Tee (used as elbow, entering run)
Both B and C

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

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

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