AFC header design by UG-34
AFC header design by UG-34
(OP)
I am checking an AFC header calculation that uses UG-34 instead of Appendix 13 to get the thickness. I am thinking of requiring an ASME U stamp. This is because I saw a footnote in UG-34 (a).
Footnote 20 says "Special consideration shall be given to the design of shells, nozzle necks or flanges to which non circular heads or covers are attached [U-2(c)]." The AFC header is non circular.
U-2(c) says to mark vessel as per UG-116. And UG-116 seems to require U stamp.
Is my understanding correct? Is a U stamp required for a non circular header designed using UG-34?
Footnote 20 says "Special consideration shall be given to the design of shells, nozzle necks or flanges to which non circular heads or covers are attached [U-2(c)]." The AFC header is non circular.
U-2(c) says to mark vessel as per UG-116. And UG-116 seems to require U stamp.
Is my understanding correct? Is a U stamp required for a non circular header designed using UG-34?





RE: AFC header design by UG-34
I have to confess that I don't know what an AFC header is, but a pressure vessel designed in accordance with ASME VIII require U stamp if operated within US (and Canada?). Outside US is meaningless. Including the non-circular headers designed using UG-34.
Cheers,
gr2vessels
RE: AFC header design by UG-34
RE: AFC header design by UG-34
As far as footnote 20 goes, it just means you need to provide a safe design (which is essentially U-2(g)). You should provide some kind check on the bolting/gasket seating stresses / deflections. I would think this would come into play if you have higher pressures, temperatures, or long unsupported spans. If the vessel is hydro-tested (UG-99) this should proove footnote 20 has been accounted for.