Process Equipment and Plant Design
In a shell and tube heat exchanger, the clearance of the tube is generally

Equal to the tube diameter
Not less than one-fourth of the tube diameter or 3/16"
More in case of triangular pitch as compared to the square pitch tube layout
More than the tube diameter

ANSWER DOWNLOAD EXAMIANS APP

Process Equipment and Plant Design
The function of manholes provided in the shell of a distillation column is to

Give access to the individual trays for cleaning, maintenance and installation
Keep a check on the liquid gradient over the plate by direct visual observation
Guard against foaming & entrainment by dumping antifoaming agent through it
All of these

ANSWER DOWNLOAD EXAMIANS APP