ring flanges

[juancito]

For a 56in OD pressure vessel, of 90 psi(g) as design pressure, we need to design a girth flange as cheap as possible, but of course in fully compliance with the Code.
Besided a fully forged SA105 ring, we are analyzing several alternatives for the ring flange fabrication, about which I need to check if any of them is not acceptable for the Code
a)Ring directly flame cut from plate + machining & drilling
b)Ring flame cut from plate but in three sectors + welding + some NDT + PWHT + mach.& drill.
c)Rolling a strip, flame cut from plate (in the same rolling direction as the plate) + welding + some NDT + PWHT + mach.& drill.

Independently of economicall and practical analisys, do you see any Code mismatch with a), b) and c) of above?
Thanks in advance
JJ

 

[arto]

Be sure to follow the requirements of App. 2-2(d)for fabbed plate flanges if it is with hubs. [i.e., rolled up, plate surfaces parallel to cL axis,etc. ]

 

[juancito]

Pls Arto, let me know what a "fabbed" plate flange is.
Thanks

 

[arto]

Fabricated, i.e., rolled up & welded