The National Board Inspection Code (NBIC) 2019 Edition, Part 4 provides rules and guidance for pressure relief devices used on boilers, pressure vessels, piping, and related equipment. This technical reference covers installation requirements, in-service inspection, repair procedures, testing practices, accreditation programs, and supplemental guidance for safe and compliant pressure relief device work.
It is intended for inspectors, owner-users, repair organizations, contractors, and other professionals involved in post-construction activities for pressure-retaining items. The document includes detailed requirements, definitions, and recommended procedures to support consistent application in industrial and jurisdictional settings.
Application Scope: Suitable for use in pressure relief valve installation, inspection, testing, adjustment, repair, and compliance activities for boilers, pressure vessels, piping systems, and related pressure equipment.
