Enter the half-apex angle for cones or conical sections. The maximum value of the half apex angle for cones under internal pressure and without toriconical transitions or discontinuity stress check is 30 degrees. The largest angle for cones under internal pressure and with toriconical sections or discontinuity stress check is 60 degrees. Typically the largest angle for cones under external pressure is 60 degrees. If you exceed these values the program will run, but with a warning. In that case the user is encouraged to use the Conical Sections module for a more detailed analysis.