Pipes, tanks and vessels may be evaluated for their resistance to collapse under external pressure and/or vacuum. With Pipemill, ring stiffeners may then be designed to prevent collapse (as right).
Evaluation is in accordance with ASME VIII Div. 1. [IUG-28, UG-29 not mentioned yet]
The pipe or cylinder may be un-stiffened or have stiffener rings of user designed, or standard, sections (see right, below (stiffener component data)).
Common materials data may be accessed from the integrated Pipemill database, which includes digitised curves.
Note: Certain paragraphs of the ASME design code allow use of nominal wall thickness where clearly the actual minimum should be considered. Pipemill always uses the minimum wall thickness.