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

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

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

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