Check your jurisdictional requirements, NB vs API. And limitations of your authorization, if you are doing it yourself.
If you exactly duplicate an existing nozzle - size, geometry, material, joint style, etc. that should be allowed to be listed as a repair, not an alteration.
When we change...
I have these, and Megyesy is most useful to bring you up to speed or refresh you.
I'd suggest watching out in his wind and earthquake section and make sure you know if your local code is the same that he used; it's been changing a lot over the last few years.
Pressure Vessel Handbook by Eugene...
