Process Equipment and Plant Design
Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure?

At the inner surface
At the outer surface
At the mid thickness of the cylindrical wall
None of these

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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

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

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