×
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

B16.5 Flange Torque
3

B16.5 Flange Torque

B16.5 Flange Torque

(OP)
I am trying to calculate a torque for bolts on a B16.5 flange. When I use the section VIII appendix 2 calculation for flange stress, I can only put a small stress on the bolts (about 25% of yield). Beyond this load the flange is overstressed due to gasket seating stresses.

We routinely torque bolts to 60% of yield with no leakage or distortion problems.
Are appendix 2 calculations applicable to B16.5 flanges? Has anyone ever run into this problem?

I would greatly appreciate any insight or advice.

RE: B16.5 Flange Torque

Check out ASME PCC-1.  It will provide the guidance that you seek.

RE: B16.5 Flange Torque

Malcolm-

In addition to TGS's advice on PCC-1, I'd suggest you read VIII-1 Appendix S. In this appendix they make it clear that the allowable stresses for bolting are for design purposes and ...it is evident that an initial bolt stress higher than the design value may and, in some cases, must be developed in the tightening operation, and it is the intent of this Division that such a practice is permissible...

jt

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