Definition(s)
Nonpressure Boundary
Components of the vessel that do not contain the process pressure (e.g. trays, tray rings, distribution piping, baffles, nonstiffening insulation support rings, clips, davits, etc.).
Source: API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration, Tenth Edition, May 2014, with Addendum May 2017. Global Standards
Nonpressure Boundary
Components and attachments of, or the portion of piping that does not contain the process pressure.
- EXAMPLE: Clips, shoes, repads, supports, wear plates, nonstiffening insulation support rings, etc.
Source: API 570, Piping Inspection Code: In-service Inspection, Rating, Repair, and Alteration of Piping Systems, Fourth Edition, February 2016, with Addendum May 2017. Global Standards