ADVICE ON IMPACT TEST FOR WNRF APPENDIX-II FLANGE

[staticmh]

Hi Folks!

Good day!

I have a one body flange (WNRF)and blind flange (NPS-72") in accordance with ASME Sec VIII Div. 1, Appendix-II. The material of flanges are SA-105N (Curve-B)
I'm pretty confident that blind flange of below sketch (150mm) thickness with SA-105N material (Curve-B) shall be surely impact tested.

but i am little confused on the impact test assessment of the WNRF body flange (SA-105N) material (thickness 175mm and welded with 16mm plate).
I've done my all assessment on the back end but looking to all valuable community members to advice on it based on their assessment whether the WNRF shall be impact tested or not. then I'll share my assessment path and conclusion to compare.

Please be remember the body flange is welded with shell 16mm plate material SA-516 Gr. 70N.

 

[SnTMan]

Governing thicknesses: Blind 38 mm, flange 16 mm, both presumably Curve B, MDMT unknown. Either shall be either impact tested or exempted, depending...

Regards

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[staticmh]

Sorry I forgot to mention the MDMT = 0 deg. C

 

[Krausen]

You may be able to save a lot of time by going with LTCS forgings instead & bypass all the impact testing on these. SA333LF2Cl1 forgings should get you there at a trivial cost increase likely. The whole MDMT rating issue with SA105 forgings under VIII-1 is a mess

 

[staticmh]

@Krausen,

I do agree with you but the situation is not like that in this case.

@SnTMan, Thanks for your valued feedback, MDMT is 0 deg. c. Please advice ahead based on MDMT.

 

[SnTMan]

staticmh, I do not have access to the current Edition, per 2017 Ed, MDMT of blind and flange would be about 11 C and -15 C, respectively. As per Krausen's post it seems the rules are different under the current Edition. You will need to confirm.

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[Morcuse]

You can always try to reduce the Blind Flange's MDMT from 11°C (approx) down to 0°C through UCS-66(b).

The welding neck flange governing thickness is 16 mm.

 

[SJones]

It is not reducing the MDMT; it is changing the requirement for Charpy testing.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.