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JoeTank said:In ASME VIII, any nozzle greater than 2NPS must be reinforced.
UG-36(c)(3) said:(3) Openings in vessels not subject to rapid fluctuations in pressure do not require reinforcement other than that inherent in the construction under the following conditions:
(a) welded, brazed, and flued connections meeting the applicable rules and with a finished opening not larger than:
31?2 in. (89 mm) diameter — in vessel shells or heads with a required minimum thickness of 3?8 in. (10 mm) or less;
23?8 in. (60 mm) diameter — in vessel shells or heads over a required minimum thickness of 3?8 in. (10 mm);