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Attached is B16.5 1968 edition. Carbon steel 400 lb at 265 = 917 psig. https://files.engineering.com/getfile.aspx?folder=0db17066-a26c-412e-aed6-f32e1110dce3&file=B16.5_1968.pdf

Fine grain practice is not "standard practice". Any additional requirements not explicitly mandated by A/SA105 should be specified on the purchase order.

ASME B16.20, Table RJ-3.2-1 specifies a maximum hardness of 160 Brinell / 83 Rockwell "B" for Type 304 Ring Gaskets. ASME SA182 does not specify a hardness requirement for F304 or F304L. ASTM A182 does not specify a hardness requirement for F304 or F304L. I personally think you'll have better...

SB-283 C70620 is not a listed material in B16.5-2020 table 1.1-1. ASME B16.24 covers cast copper alloy flanges, so unfortunately SB-283 C70620 is not listed their either.

B16.11 couplings can be manufactured as reducing fittings and as combination fittings. So you could specify a 1" socket weld x 1/2" threaded 6000 coupling.

B16.5 has 3 material groups. Groups 1, 2, and 3. Each group has sub groups. Groups 1.1, 1.2, ..., 2.1, 2.2, ..., 3.1, 3.2, ..., etc. Each of these subgroups have different pressure / temperature ratings. Hint: class 150, 300, 400, 600, 900, 1500, and 2500 are identifications not actual...

Another product similar to what Littleinch suggested is the double studded adapter. https://www.whitliejospecialty.com/product/double-studded-adapters/ Its a relatively easy part to manufacture, so it shouldnt have a long leadtime.

This is a one-off, so we are matching the B16.47 series A bolt pattern. 30" 300 WNs are fairly common... agree, madness.

@LittleInch - 30" Class 300. I am not certain why the end user is not requesting standard flanges. As a manufacturer, we work with the distribution network and not directly with the user, so typically, we do not get all of the information upfront. We were simply told the flange design must be...

@BJI - thank you for the paragraph references. @Littleinch, I was designing a large diameter slip-on flange. It exceeds B16.5 and it is not listed in B16.47. Additionally our customer will not accept "industry standard" slip on flanges.

GD2, thank you for the reply. I wasn't certain if the values used in the calculations would be different than what's published in II-D because my design code is B31.4. In B31.3-304.5.1 it clearly states "using the allowable stresses and temperature limits of this code", but B31.4-404.4.1 does...

Hello all, when sizing a flange per ASME VIII-1 appendix 2 for use in B31.4 what is the appropriate bolt design stress (Sa and Sb). B31.4 does not address this like B31.3 304.5 and design factor x minimum yield strength seems too high.

I tried looking around for an official code interpretation, but couldnt find anything. We have a customer seeking an integrally reinforced nozzle similar to ASME Section VIII-1, Fig. UG-40 (e-1), is it the intent of the code to limit the credit of "A5" available reinforcement to the height of...