Cylindrical or spherical shells under external overpressure can fail by plastic or elastic buckling. Material-temperature-curves for different material groupings are indicated in the ASME-Code, which permit to determine the allowable external overpressure.
The allowable external overpressure for cylindrical and spherical shells can be calculated with the module UG28. The required wall thickness is iteratively determined.
ASME Boiler & Pressure Vessel Code VIII, Div. 1
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