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

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

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Process Equipment and Plant Design
For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell

May decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell
Decreases upwards
Increases upwards
Remains same throughout

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