Toriconical maximum apex angle?

[torsani]

Hi

ASME VIII-1 UG-32 doesn't clarify what is the maximum apex angle of toriconical heads unde internal pressure.
Until what angle can I use UG-32(h) rules?
I think that the limit is 60 degree because UG-32(j). Am I right?
After the limit can I calculate toriconical head as a flat head?

Thanks,

Torsani

 

[JStephen]

I'm looking at the previous edition of the Code. But it appears the angle is not limited one way or the other in it.

Under section (g), alpha of 30 degrees or less falls under equation 4, otherwise use 1-5.

Under section (h), toriconical heads "may" be used when alpha is less than 30, and are "mandatory" when alpha exceeds 30 degrees.

 

[Shmulik]

UG-32(g) states: "Toriconical heads or sections may be used when the angle ??30º, and are mandatory for conical head designs when the angle ? exceeds 30º, unless the design complies with 1-5(g)."
In addition to 1-5(g), you may be assisted by Bednar's "Pressure Vessel Design Handbook": Membrane Stress Analysis of Vessel Shell Components - 3.7. Conical Heads (page 66÷69).