Process Equipment and Plant Design
A cylindrical storage tank can have a self supported conical roof,

Irrespective of its diameter
If the thickness of the roof is more than that of the cylindrical shell
If its diameter is less than 15-20metres
If its diameter is more than 50 meters

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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.

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

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