Korbogen head in ASME VIII
Korbogen head in ASME VIII
(OP)
Can anyone advise if a Korbogen Head (DIN 28013) is acceptable as an elliptical head as per ASME VIII div 1? I have a vendor who insists it is but when I look at the dimensions it does not seem to comply with ASME VIII.
Thanks in advance
Thanks in advance
Ron Frend
http://www.predicon.net





RE: Korbogen head in ASME VIII
The shape of semiellipsoidal form is well defined at UG-32(d) with its acceptable approximation: "An acceptable approximation of a 2:1 ellipsoidal head is one with a knuckle radius of 0.17D and a spherical radius of 0.90D".
"Korbogen" shape based on knuckle radius of 0.154D and spherical radius of 0.80D which exceed UG-81(a) acceptable tolerances for formed heads.
RE: Korbogen head in ASME VIII
I don't know how your AI would approach this question, but I ran a very very simple FEA just out of curiosity and the Korbogen Head actually produces lower stresses than the standard ASME S.E. head. It also is very close to the requirement of UG-32(d) where half the minor axis equals one-fourth of the inside diameter of the head skirt.
If all else fails, you could calculate the head as a flanged/dished head and enter the real radii.
Sorry that I'm not giving a yes/no... ask your AI.
Cheers,
Marty
RE: Korbogen head in ASME VIII
Best Regards
AMinati
RE: Korbogen head in ASME VIII
I would agree with Marty007, treat this head as F&D and check if it is meeting design requirements of ASME.
Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN