AWWA Flange for ASME VIII, Div 1 Service
AWWA Flange for ASME VIII, Div 1 Service
(OP)
I have an AWWA table 4 class E flange that we are planning to use on a 42" OD vessel. The flange is a 42" 125# slip on flange per AWWA table 4 class E. My design pressure is 150 psi @ 200 F and is SA105 material.
I tried analyzing as an ASME VIII, Division 1, Appendix 2 flange, but it did not meet code requirements (mainly the flange thickness).
My question is as follows:
1.) Can you use a AWWA Table 4 Class E flange for ASME VIII, Division 1 pressure vessel service?
2.) If it does not meet the Appendix 2 requirements, can the 275 psi rating per AWWA Table 4 class E be valid for ASME VIII, Div 1? This is built and rated by Texas Flange.
3.) Would I need to run an ASME VIII, Div 2, part 5 design by analysis approach for div 1 service to determine the adequacy for service on a pressure vessel?
Thank you in advance for your help!
I tried analyzing as an ASME VIII, Division 1, Appendix 2 flange, but it did not meet code requirements (mainly the flange thickness).
My question is as follows:
1.) Can you use a AWWA Table 4 Class E flange for ASME VIII, Division 1 pressure vessel service?
2.) If it does not meet the Appendix 2 requirements, can the 275 psi rating per AWWA Table 4 class E be valid for ASME VIII, Div 1? This is built and rated by Texas Flange.
3.) Would I need to run an ASME VIII, Div 2, part 5 design by analysis approach for div 1 service to determine the adequacy for service on a pressure vessel?
Thank you in advance for your help!





RE: AWWA Flange for ASME VIII, Div 1 Service
2) No
3) Possibly, you would have to get the client, your AI and any other interested parties to buy-in.
Why not just use a B16.47 flange, or an Appendix 2 flange and make your life simple?
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: AWWA Flange for ASME VIII, Div 1 Service
Agreed with SnTMan, B16.47 flange is a good choice for the vessel.
RE: AWWA Flange for ASME VIII, Div 1 Service
"The world is full of things you can buy. Not all of them are suitable for use in Code pressure vessels."
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
Edit typo
RE: AWWA Flange for ASME VIII, Div 1 Service
If the div 2, part 5 analysis method works and would the flange be adequate for service?
On a side note, why do standard ansi flanges B16.5 not meet the appendix 2 design requirements in some sizes?
RE: AWWA Flange for ASME VIII, Div 1 Service
Your first question, I'd say yeah, under U-2(g) if all the involved parties permitted it.
So why not just design, to Apx 2, a slip on flange per the AWWA dimensions you desire. Make the thickness comply with Apx 2. Burn ID / OD from plate, machine the gasket face, drill the bolt circle, weld it on. Be done.
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: AWWA Flange for ASME VIII, Div 1 Service
RE: AWWA Flange for ASME VIII, Div 1 Service
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: AWWA Flange for ASME VIII, Div 1 Service
RE: AWWA Flange for ASME VIII, Div 1 Service
RE: AWWA Flange for ASME VIII, Div 1 Service
RE: AWWA Flange for ASME VIII, Div 1 Service
AWWA flanges are typically flat-faced, used with full face gaskets.
I believe some of the flange suppliers (possibly Texas flange) also have flanges available made to ASME B16.47 geometry, but in a slip-on configuration- that'd fall under App. 2 also.
RE: AWWA Flange for ASME VIII, Div 1 Service
(g) This Division of Section VIII does not contain rules to cover all details of design and construction. Where complete details are not given, it is intended that the Man- ufacturer, subject to the acceptance of the Inspector, shall provide details of design and construction which will be as safe as those provided by the rules of this Division.
RE: AWWA Flange for ASME VIII, Div 1 Service
U-2(g):
So first question, are complete details for the design of slip-on flanges given in VIII-1? The answer is yes, Appendix 2 provides complete rules for the design of slip-on flanges.
Even if you did perform an FEA and convinced yourself of the results (interpreting FEA results for a flange is non-trivial), you are still trying to justify a thinner flange than would be calculated using Appendix 2. So, you would fail the second test of U-2(g); your flange would be thinner than an Appendix 2 designed flange, so would not be as safe as a flange designed using the rules of Division 1.
If your connecting piping uses AWWA flanges, then I would design a custom flange using Appendix 2. You can design a ring flange that matches the OD and bolt pattern of the AWWA flange. It may be thicker than a standard AWWA flange, but this can be made up
RE: AWWA Flange for ASME VIII, Div 1 Service
Is my only option to increase the SO flange thickness to meet appendix 2?
Or can I us div 2, part 5?
After this discussion and research I think div 2, part 5 may not be allowable?
RE: AWWA Flange for ASME VIII, Div 1 Service
RE: AWWA Flange for ASME VIII, Div 1 Service
RE: AWWA Flange for ASME VIII, Div 1 Service
So just to confirm, I would have to increase the flange thickness of the 42" 150# RF SO flange to meet the appendix to requirements.
Out of curiosity, why is there a size 42" 150# RF SO size if not good for ASME VIII? Is this only good for B31.3?
RE: AWWA Flange for ASME VIII, Div 1 Service
RE: AWWA Flange for ASME VIII, Div 1 Service
RE: AWWA Flange for ASME VIII, Div 1 Service
The AWWA flanges listed above are typically used on steel water piping.
The 150# "Industry Standard" forged flanges CAN be used with Section VIII, but have to be designed per Appendix 2 as noted above. Actual allowable pressure will depend on the corrosion allowance, etc.
By the way, if you're running the flange design with A193 bolts and it fails, you might try using A307 Grade B bolts, which greatly reduces the bolting load.