NBIC Overview
What the domain tests
Domain 1 checks whether you can place a job inside the NBIC structure rather than reaching for ASME construction rules. The NBIC is published by the National Board of Boiler and Pressure Vessel Inspectors and is organized by activity: Part 1 installation, Part 2 inspection, Part 3 repairs and alterations, and Part 4 administration. Supplements address specialized subjects. The code uses mandatory “shall” language; “should” is guidance. Jurisdictional law controls adoption, so the NBIC never overrides a state or provincial requirement.
Core rules
- New construction is generally governed by the ASME BPVC; the NBIC picks up in-service inspection, repair, alteration, and administrative oversight.
- An AI, AIS, AIA, or owner-user inspection organization has a defined role; do not assign an NBIC duty to a role that the code does not give it.
- Edition control matters: verify the edition adopted by the jurisdiction and cited by the owner before applying a requirement.
- A repair restores something to a safe condition; an alteration changes design or operating limits and triggers different review and documentation.
Worked example
A contractor proposes to weld-repair a cracked boiler shell. The AI first asks whether the work restores the original design. If yes, Part 3 repair rules and a repair report apply. If the proposal adds a new opening or changes design pressure, it is an alteration, not a repair, and requires design review and alteration documentation. The AI does not decide from the contractor’s label; the AI decides from the scope.
Traps
Using ASME construction acceptance criteria for an in-service repair; assuming the newest NBIC edition applies before adoption; treating “should” as mandatory; and missing that a jurisdictional requirement can be stricter than the NBIC.