ASME Cutomise Flange to VIII-1 App.2

[mech012902]

Can somebody please help me to my confusion to ASME 8?
Is it allowed to manufacture customise weld neck flange from a cylindrical forged bar material?

 

[BradSr]

The specification for the materials are probably SA-105 for Carbon Steel & SA-182 for Stainless

 

[BradSr]

Also you should read UG4 through UG14. Pay attention especially to UG14.

 

[mech012902]

Thanks!
I think more specific to UG-6,UG-14 and App 2.
PLease correct me if im wrong, ok.
UG-6 allows me to use forge material in pressure vessel construction.
UG-14 mentions limitation of the use of forged rod or bar.
UG-14(b) is a little bit a confusion. Does it means here flanges of all types are not allowed to be machined from a forged bar?

And Appendix 2-2(d)(1), confusingly mentioned hubbed flanges may be machined from a hot rolled or forged bar...
What I know, if i will design customise weld neck, it will be hubbed flange and this allows me to machined it to a forge bar. Unless, ASME has a different interpretation on it. Please comment. Thanks!

 

[codeeng]

I think if you follow the requirements of the flange material spec you on the right track. SA105 for example says you can't use solid bar stock for flanges.

 

[BradSr]

Before you get to far - if the weldneck flange is of the bolted type connection - then App 2-2(a) gets you back to UG-14 which disallows the use of bar for flanges.

UG-14(b) was just added in the 2005 Addenda to clarify per Code Case 2148, the use of bar for Nozzles.

 

[mech012902]

Thanks guys, its a great help!