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NBBI NB23-2025

National Board Inspection Code, Complete Set
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The National Board of Boiler and Pressure Vessel Inspectors Logo

NBBI NB23-2025

National Board Inspection Code, Complete Set

PUBLISH DATE 2025
NBBI NB23-2025
National Board Inspection Code (NBIC) NB-23

The National Board Inspection Code (NBIC) NB-23 is a comprehensive standard that provides rules for the post-construction care, integrity, and safety of pressure-retaining items (like boilers, pressure vessels) and pressure relief devices, covering Installation, Inspection, Repairs/Alterations, and Pressure Relief Device Testing. It ensures equipment safety through uniform guidance for owners, inspectors, and technicians, focusing on maintaining mechanical integrity throughout the equipment's life cycle.

Purpose of NBIC NB-23
  • Ensure Safety: To maintain the integrity and safety of pressure equipment for public and personal safety.
  • Standardize Practices: To provide uniform rules, guidance, and information for all post-construction activities.
  • Cover Life Cycle: To address the entire life cycle after initial construction, including installation, routine checks, and necessary fixes.
How it's Used (The Four Parts)

The NBIC is divided into four parts, each addressing a specific area:

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  • Part 1: Installation: Guidelines for properly installing pressure equipment, ensuring correct construction, materials, safety devices, and operation.
  • Part 2: Inspection: Information on performing and documenting inspections, covering safety, non-destructive testing (NDT), failure analysis, and risk-based assessments.
  • Part 3: Repairs and Alterations: Rules for acceptable repairs or modifications to equipment, even when original code requirements can't be met, and detailing alternative methods.
  • Part 4: Pressure Relief Devices: Ensures proper installation, inspection, repair, and testing of safety valves and other pressure relief devices (PRDs).
Who Uses It?

Manufacturers, jurisdictional authorities, inspectors, owner-users, and contractors involved with boilers, pressure vessels, and relief devices.

SDO NBBI: The National Board of Boiler and Pressure Vessel Inspectors
Document Number NB23
Publication Date July 1, 2025
Language en - English
Page Count
Revision Level
Supercedes
Committee
Publish Date Document Id Type View
July 1, 2025 NB23-2025 Revision