Contact US

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!

*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

API 6AF2 flange capacities

API 6AF2 flange capacities

API 6AF2 flange capacities

I am trying to reproduce or verify the capacity chart in 6AF2, especially by leakage criteria. I verified couple sizes and several load cases for each size. The result I got was lower than 6AF2. Wondering if anyone did the same thing before?

The leakage criteria in 6AF2 is:
1) fix the outer edge of ring groove bottom
2) apply unit bolt pretension, pressure, external tension, and bending moment, respectively
3) calculate when compression from pretension is exhausted by other three load sources, flange leaks.

Therefore, the very outside point, on the tension side to bending moment, of the edge being fixed should leak first. But when I plugged in the limiting loads from 6AF2 into my FEA, I get about 30~40% of circumferential line losing contact, rather than only the very outside point or a small percentage, say 5%. Good thing is that the discrepancy is somewhat consistent, not all over the place. I checked 6AF2 many times and very carefully, about their FEA setup and leakage criteria, but still not 100% clear about them. So I am not sure if I did the same thing as 6AF2 and would like to ask if anybody has any experience on this matter?

By the way, I am using solidworks simulation for FEA.

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! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close