×
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

Reverse loose metal to metal flange: Appendix Y or Appendix 2-13

Reverse loose metal to metal flange: Appendix Y or Appendix 2-13

Reverse loose metal to metal flange: Appendix Y or Appendix 2-13

(OP)


Hello all,

Can a reverse loose ring flange, that has metal to metal contact outside of bolt circle be designed per Appendix Y? We have a customer that has provided a design and calculations from App. Y and has asked us to review for compliance. I take App. Y to be for metal to metal regular flange configuration (not reverse). By using App. Y, the customer is getting a much thinner flange (1.1" thick) than by using App. 2-13 which yields approximately 3.3" thick. Attached is a simplified detail of the reverse loose flange in question.

Any insight is appreciated if appendix Y can be used in this situation or if 2-13 shall be used.

If appendix Y is applicable, I would consider this flange a class 3 (a flat blind attaches to the flange in question), category 3 (loose flange without a hub) and proceed with applicable equations for calculations from table Y-6.1

Thanks all!

"Success is not final, failure is not fatal: It is the courage to continue that counts."
Winston S. Churchill

RE: Reverse loose metal to metal flange: Appendix Y or Appendix 2-13

So the mating flange has an o-ring groove ?

RE: Reverse loose metal to metal flange: Appendix Y or Appendix 2-13

(OP)
Yes, the mating flange (blind) accepts an o-ring.

"Success is not final, failure is not fatal: It is the courage to continue that counts."
Winston S. Churchill

RE: Reverse loose metal to metal flange: Appendix Y or Appendix 2-13

In your simplified detail, the distance from the inside surface
of the vessel to the bottom of a drilled hole is insufficient: see UG-43 (g)
Regards
r6155

RE: Reverse loose metal to metal flange: Appendix Y or Appendix 2-13

(OP)
Correct r6155, we have that marked on our review as that minimum distance needs to be 0.25 of wall thickness per UG-43 while meeting thread engagement requirements of stud (there is no corrosion allowance on this product).

Thanks

"Success is not final, failure is not fatal: It is the courage to continue that counts."
Winston S. Churchill

RE: Reverse loose metal to metal flange: Appendix Y or Appendix 2-13

I am not sure how Appendix Y factors in the o-ring groove in calculating tII or if it does, this should be looked into. Otherwise, your approach appears reasonable.

RE: Reverse loose metal to metal flange: Appendix Y or Appendix 2-13

I don´t know design pressure and materials used, but for 43” flange diam. the thickness of 1,1” sound insufficient, and 3,3” excessive.
Consider factor y=0 and m=0 for O-ring gasket
Regards
r6155

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