Pressure Vessel Head Calculation or simple PVEngHead is the best app to calculation the following pressure vessel head properties for both internal and external pressure:

+ Required Thickness,
+ Commercial Thickness,
+ Thickness After Forming,
+ Elongation,
+ Hydrostatic Test Pressure according to UG-99(b), UG-99(c) and UG-100,
+ MAWP (Maximum Allowable Working Pressure).
+ Blank Plate,
+ and much more!

The calculations uses the rules and equations from ASME Section VIII Division 1.

This app supports the following head types:

+ Ellipsoidal,
+ Torispherical,
+ Conical,
+ Toriconical,
+ Hemispherical,
+ Flat

*** This is a BETA app, we are still working on it ***