×
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

Derating of ASME Appendix 2 Flanges for External Loads

Derating of ASME Appendix 2 Flanges for External Loads

Derating of ASME Appendix 2 Flanges for External Loads

(OP)
Currently I utilize the "Equivalent Pressure Method" to derate all of my ASME Code Appendix 2 flanges. It is very easy to use but it is also VERY conservative.

I understand that you can also use the "Equivalent Axial Force Method":   F = 4M/G
Where:
M = moments acting on the flange
G = mean gasket diameter
F = equivalent axial force

The only problem is I am not completely clear on how to use this method. Does "M" represent the sum of all my external moments? And how do I apply this equivalent axial force to my flange to make sure it can take the loads?

Does anyone utilize this method or should I stick with my current analysis?

Thanks!!
 

RE: Derating of ASME Appendix 2 Flanges for External Loads

The 'Kellogg equivalent pressure' method is very conservative if the combined pressure = P+Peq is compared to ASME B16.5 allowable and similar. A better approach is to use the combined pressure then use it to do an ASME VIII / PD5500 flange stress calculation. This is the method adopted in ASME III.

Your 'equivalent force', seems to be only part of a solution. The equation terms are same as Kellogg, when
4/(pi.G^2) is factored out.  

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