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?
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 ?
RE: Appendix 2 Flange Made from Rolled Ring w/ Butt Joint ?
Regards,
Mike
RE: Appendix 2 Flange Made from Rolled Ring w/ Butt Joint ?
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 ?
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 ?
Regards, dinesh
RE: Appendix 2 Flange Made from Rolled Ring w/ Butt Joint ?
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 ?
Shell to ring S/O or lap welds E per UW-12 type of weld used.