Process Equipment and Plant Design
In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement

Results in higher shell side pressure drop
Can accomodate less number of tubes for a given shell diameter
Facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell side fluid
Creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer co-efficient

ANSWER DOWNLOAD EXAMIANS APP

Process Equipment and Plant Design
Seamless pipe is made

By extrusion & casting into static and centrifugal molds
Both B and C
From rolled strips formed into cylinders and seam-welded
By forging a solid round, piercing it by simultaneously rotating & forcing it over a piercer point and further reducing it by rolling gas drawing

ANSWER DOWNLOAD EXAMIANS APP