Reinforcement limits around nozzles are defined by which zone?

• A. Specified reinforcement zone
• B. Outer diameter zone
• C. Minimum wall thickness zone
• D. Weld reinforcement zone

Answer: (A)

Reinforcement around a nozzle is governed by a defined region around the opening called the specified reinforcement zone. This is the standardized area in the code where extra material is provided to strengthen the nozzle connection and to distribute stresses from internal pressure and welding. By designating this zone, the code ensures consistent reinforcement requirements and avoids ambiguity in how much reinforcement is needed or where it ends. The other concepts described do not define the specific area used to limit nozzle reinforcement; they refer to different design considerations such as general shell dimensions, minimum wall thickness, or weld bead areas. Therefore, the specified reinforcement zone is the correct concept.