UG-14 and flange 3

[ME231]

Hi all,
I do know that bar and rod material may be used for manufacture of shells and heads of pressure vessels using code cases 2155 and 2156. Could anyone perhaps point me to a code case and/or interpretation for use of bar stock for the manufacture of flanges for pressure vessels? It seems UG-14 prohibits this.
Any help would be highly appreciated.
Thanks in advance!

 

[CodeRef]

Ring Flanges or Hubbed flanges?

 

[ME231]

The intention is to use a ring type flange integral to the shell of a T316 (SA479) SS material and machined out of bar stock.
Thanks for your response CodeJackle!

 

[CodeRef]

You say integral to the shell which to me implies a hub.....If you stay within the guidelines specified in MANDATORY APPENDIX 2 RULES FOR BOLTED FLANGE CONNECTIONS WITH RING TYPE GASKETS. See Paragraph 2-2(d) you should be safe. I understand your dilemma and you may need to go for a Code Interpretation asking whether CC2155 and CC2156 can be used to address flanged heads/shells, it may help you in the long run.

Also see the following interpretation which I think does not help your case:
Interpretation: VIII-1-07-17
Subject: Section VIII, Division 1 (1998 Edition, 2000 Addenda); Appendix 2, 2-2(d)(1)
Date Issued: January 8, 2007

found here:

http://cstools.asme.org/csconnect/FileUpload.cfm?View=yes&ID=864

 

[CodeRef]

This one may help your case:
Interpretation: VIII-1-86-171
Subject: Section VIII, Division 1, Appendix 2, 2-2(d)(1), Use of Bar for Manufacture of Hubbed Flanges
Date Issued: October 26, 1987

Please consult your AI or AIA of record for clarification of Code requirements.

 

[ME231]

Thanks CodeJackal. I will try to see if I can get an interpretation out of the rule makers!
In the meanwhile if you could think of something else, please do keep the suggestions coming in.
I will keep you posted.
Thanks again.

 

[SnTMan]

sp231, CodeJackal under Sec VIII Div 1, flanges may be considered integral without use of a hub, depending on the weld details. See Apx 2-4(2)&(3),and Fig 2-4.

I am not offering an opinion on the use of bar, though.

Regards,

Mike

 

[ME231]

Thanks SnTMan, Please not that we plan on using an integral flange - the flange as well as the shell are to be machined from the same bar stock. We are therefore not looking at performing any welds to attach the flange.
Any new thoughts in light of this info?

 

[SnTMan]

sp231, my remarks are limited to Sec VIII, Div 1 applications:

Your flange can be designed as an integral flange similar to Fig 2-4 (5).

UG-14 would appear to disallow bar for this use, however we recently bought some approx 10" round that was certified as both bar and forging, you might look into this.

I don't know if there are any applicable Code Cases or interpretations, sorry.

Regards,

Mike

 

[CodeRef]

I do not have an official copy of Code Case 2156 Rev 1 (CC-2156-1) However, I believe the scope of the 2156-1 Code Case specifically disallows use for all types of flanges except as permitted by Appendix 2,
See unofficial link:

http://cstools.asme.org/csconnect/pdf/R6576.pdf

I also agree with SnTMan's comments regarding integral flanges.

 

[ME231]

Thank you both for excellent feedback. I am now more informed on this subject than I was a couple of days ago.
Hope the material i have gathered with your help serves to a allay the concerns of out NB.

 

[ME231]

On a seemingly separate yet related issue, do you believe that I could make flanges out of SA479 material?

 

[CodeRef]

No. Limitations exist for bar and forged rod materials.[see UG-6(b)]

SA-479 is a bar specification and the limitations are specified in UG-6(b), UG-14, and Appendix 2.

NOTE: Appendix 2 paragraph 2-2(a) specifies compliance to UG-4 through UG-14.

From prior posts I know you are aware of the Code Cases CC-2155 and CC-2156-1

I believe the same limitations for the use of bar materials exist for the use of plate materials.
See UW-13(f) and Appendix 20 for limitations on the use of plate.

Why, because it is written in the Code that way. I am sure the ASME committee members have their reasons, maybe not the same reasons, but as a committee, they agree on the limitations.