Process Equipment and Plant Design
A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the

Central dished section and straight flange section
Corner torus section and central dished section
Central dished section and corner torus section
Straight flange section and corner torus section

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

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