×
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

Transition rings

Transition rings

Transition rings

(OP)
Maybe somebody knows  if fabrication  of  oval  transition rings  are supported by any  API,  ASME, ASTM, DIN  Standards?

RE: Transition rings

If you refer to transition nozzles, then look up to API 661.
Cheers,
gr2vessels  

RE: Transition rings

(OP)
NO I MEAN  FOR  RINGS  INSTALLED IN FLANGES OF DIFFERENT SIZES

RE: Transition rings

So you're talking about the rings inserted as gaskets between Ring Type Joint (RTJ) Flanges ?

If so these are available as either "Oval" or "Octagonal".  Either should be manufactured to the requirements of ASME B16.20.

If you are talking about a ring which can be used to connect two different sizes of flanges with the same pitch circle diameter but different ring groove diameters (see link below) then there is no industry standard that I am aware of that addresses these items. I've never seen a need for such an item and don't think I would use one.  If I absolutely had to mate two different systems (ignoring the associated implications of different pressure ratings), I would build a short piping spool to get from one to the other (different flange on each end).

http://www.danloc.com/Special.htm

RE: Transition rings

here is a better page it's even go a phone number and it says all their products are made to API 6A Specs.

http://www.wiremasters.com/

RE: Transition rings

Actually, when you drill down to the details on the Wire Masters site you see the detailed description of the rings and they have both API and non-API rings.  The transition rings are shown as "non-API".  Take a look at this page ...

http://www.wiremasters.com/SubFolder/02%20api%20metal%20ring%20gaskets.htm

The Danloc page I linked to originally also says that the Danloc transition rings are not in accordance with API.

RE: Transition rings

(OP)
On my  special application I have a transition ring one  side  R55/ and in the other side  R51,  which  is really important  is that both  R55/R51 complies the ANSI # 2500,  and the  width  of these rings  fits  into the groove flange.
Why  this is not in accordance with API?

RE: Transition rings

An R51 is for an 8" flange and an R55 is for a 10" flange.  I suspect the issue is that flange joints are "designed" (look at Appendix 2 to ASME Section VIII Div 1) and the designers who came up with the standard configurations shown in the ASME and API standards probably didn't envision connecting two flanges of different sizes together and so these cases were not considered in designing and dimensioning the flange and bolting arrangements - and are thus not included in the standards.

Unfortunately, there is much more to the design of a flanged joint than ensuring that the gasket fits in the groove.

In theory, if you want to use a transition ring, you would need to do the flanged joint design yourself to ensure the stresses in the flanges / bolting where acceptable (using something like Appendix 2) and then you would need to have the gasket design confirmed to ensure it was acceptable (something like FEA). However, not sure that even with that the configuration would be acceptable to your design code or regulatory authority?

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