×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Korbogen head in ASME VIII

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

Ron Frend
http://www.predicon.net

RE: Korbogen head in ASME VIII

Ron Frend: in my opinion, it is not.
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

Ron Frend,

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

Assume your Korbogen Head is elliptical (or according ASME Code) and check the tollerances of the real shape against the theoretical. If the check pass the head can be accepted as elliptical (or according ASME Code) See also UG-81.

Best Regards

AMinati

RE: Korbogen head in ASME VIII

Korbogen Head (DIN 28013) heads do not meet UG-81 tollerances against 2:1 ASME heads (KR: 0.17D and CR:0.9D).
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

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources