Process Equipment and Plant Design
A stuffing box is used for

Reducing the resistance of fluid flow
Absorbing the contraction/expansion of pipeline due to temperature changes
Facilitating smooth opening and closing of a valve
Prevention of fluid leakage around moving parts

ANSWER DOWNLOAD EXAMIANS APP

Process Equipment and Plant Design
Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger

Permits the use of less tubes in a given shell diameter
Both B and C
Permits the use of more tubes in a given shell diameter
Facilitates comparatively easier external cleaning because of large clearance

ANSWER DOWNLOAD EXAMIANS APP