AWWA Flange for ASME VIII, Div 1 Service 3

[engpes]

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!

 

[JStephen]

"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?"

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.