Which guideline governs nozzle reinforcement?

• A. UG-16
• B. UG-28
• C. B31.3
• D. ASME VIII

Answer: (B)

Reinforcing a nozzle is tied to the way the vessel shell and the nozzle meet, creating a local stress concentration that must be managed to keep the vessel design safe. In ASME Section VIII, there is a dedicated set of rules that addresses nozzles and how they must be reinforced, including how thick the reinforcement should be and how it should be attached to the shell. This guidance is found in the nozzle reinforcement provisions of UG-28. It specifically covers the requirements for reinforcing pads or bosses, their sizing, and the weld details needed to ensure the nozzle connection can carry the design stresses without weakening the vessel.

The other options don’t provide the nozzle-specific reinforcement rules. One covers piping design rules for process piping, not vessel nozzles; another is the broader vessel code without the nozzle-focused reinforcement details; and the remaining is an overall code family rather than the exact clause that governs this particular detail. So the guideline that governs nozzle reinforcement is the nozzle-related provisions in UG-28.