Process Equipment and Plant Design
Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than __________ of the head.

3 times the thickness
Either A or B, whichever is smaller
Either A or B, whichever is larger
6% of I.D.

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Process Equipment and Plant Design
A certain pressure vessel manufacturer avoids doing reinforcements calculations for openings by always providing a reinforcing pad extending upto double the diameter of the opening and of the same material and thickness as that of the shell wall. If area compensation is accepted as a code guideline, his approach leads to safe design

Only if the opening is on a vertical cylinderical vessel
Only if the opening is on spherical vessel
Irrespective of the shape of the vessel
Only if the opening is on a horizontal cylinderical vessel

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