Hi MGR,
There is no built in "End Cap" element selection in PV Elite. The formulas for computing the required thickness of heads in the ASME Code are based upon "ellipsoidal", "spherical" and "torispherical" shapes. So, you have to choose one of those. In my opinion, you are correct in choosing ellipsoidal.
You could also review the literature and contact the manufacturer for more information.
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Scott MayeuxCADWorx & Analysis Solutions
Intergraph Process, Power, & Marine