NBIC NB23-4 2017 provides Part 4 of the 2017 National Board Inspection Code, focused on pressure relief devices for pressure-retaining items. This digital publication covers installation requirements, in-service inspection, repair of pressure relief valves, accreditation topics for VR repair organizations, supplements for specific pressure relief valve applications, metrication policy, technical inquiry preparation, glossary terms, and approved interpretations.
Designed for inspectors, jurisdictional authorities, owner-users, installers, contractors, repair organizations, and engineering professionals, this PDF supports consistent application of NBIC post-construction rules related to pressure relief device safety, testing, maintenance, documentation, and repair.
Application Scope: Applies to pressure relief devices associated with boilers, pressure vessels, piping systems, water heaters, thermal fluid heaters, pressure reducing valve stations, and related post-construction inspection and repair activities governed by the 2017 National Board Inspection Code.
