ASME Section III Subsection NB
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ASME Boiler and Pressure Vessel Code Section III Division 1, Subsection NB: Class 1 Components
2025 Edition
Published by ASME International, 07/01/2025
ASME Section III Division 1, Subsection NB – This Subsection contains requirements for the material, design, fabrication, examination, testing and overpressure protection of items which are intended to conform to the requirements for Class 1 construction. The rules of Subsection NB cover the requirements for assuring the structural integrity of items.
| Revision | 2025 Edition |
|---|---|
| Published Date | July 1, 2025 |
| Status | Active, Most Current |
| Document Language | English |
| Published By | ASME |
| Page Count | 239 |





