×
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

Appendix 2 Flange Made from Rolled Ring w/ Butt Joint ?

Appendix 2 Flange Made from Rolled Ring w/ Butt Joint ?

Appendix 2 Flange Made from Rolled Ring w/ Butt Joint ?

(OP)
Has anyone been asked to modify the Appendix 2 thickness calc because of a welded ring.
Here's my situation....
We use Loose type Flanges designed in accordance with ASME Sect. VIII Div.1, 2013 Appendix 2, fabricated from a rolled and welded ring using the lower stress values per Note G5 in Sect. II-D. This 14.75" od x 12.75" id x 3.25" thick ring is welded together with a full penetration butt weld in accordance with code. I'm being asked to apply an "E" efficiency factor to the design of the flange or perform 100% x-ray on this seam. I've responded that the Flange meets all Appendix 2 design requirements and that applying a Efficiency factor is not required. Has anyone been asked to modify the Appendix 2 thickness calc because of a welded ring?

RE: Appendix 2 Flange Made from Rolled Ring w/ Butt Joint ?

You cannot use joint efficiency factor in an App.2 calculation, since there is no any mentioned. Of course if you want, you can reduce the allowable stress for the flange to be conservative, but you do not need to. If the flange is 3,25” thick made of ferritic steels you’ll need to perform 100% radiography since it’s a butt weld and the discussion is finished.

RE: Appendix 2 Flange Made from Rolled Ring w/ Butt Joint ?

bayardwv, Apx 2 makes no mention of loose flanges fabricated in this way, thus no special requirements. However, other parts of the Code govern whether your butt-weld shall be examined or heat treated. See Parts UW, UCS, UHA, etc.

Regards,

Mike

RE: Appendix 2 Flange Made from Rolled Ring w/ Butt Joint ?

(OP)
Than you for responding. I have someone insisting that this isn't a safe design because I've neglected to address this joint,as is required on a rolled and welded shell.
Yes I'm aware of the other requirements regarding the material & design of this 3/4" wide x 3-1/4" tall rolled & welded ring. It's weleded to an 11 gauge shell in accordance with Fig. 2-4(3a), and no additional testing or design modification is required.

RE: Appendix 2 Flange Made from Rolled Ring w/ Butt Joint ?

bayardwv, you in turn may insist this seam is not primarily pressure retaining, as in a shell. You may insist Appendix 2 place no restrictions on such a construction.

If dimensions are suitable (not clear from your posts) you might consider in the future just burning a ring from plate, rather than roll and weld.

Regards,

Mike

RE: Appendix 2 Flange Made from Rolled Ring w/ Butt Joint ?

Hi SnTMan, I will like to add one point the welded thickness of flange needs to consider while work out MDMT (Minimum Design metal Temp.). This may call for Impact test requirement.
Regards, dinesh

RE: Appendix 2 Flange Made from Rolled Ring w/ Butt Joint ?

(OP)
Thanks everyone,
I don't believe burning an OD/ID ring from 3-1/2" thick plate would be cost effective.
Example: We start with a piece of FB or PL, 1" thick x 3-1/2" wide x 43-1/4" lg, roll it to a 12.75" ID ring and weld ends together with a full Penetration weld.
We now have the 12.75" ID X 14.75" OD X 3.5" high lockring. It is then attached to the shell like a slip-on flg with a fillet in &out. The 1" thickness is the determining factor as to whether or not Impact testing is required, not the 3-1/2".

RE: Appendix 2 Flange Made from Rolled Ring w/ Butt Joint ?

Ring but weld will need RT or derate per E in UW12.
Shell to ring S/O or lap welds E per UW-12 type of weld used.

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