A subsection of piping systems that includes piping and components that are exposed to a process environment of similar corrosivity and expected damage mechanisms and is of similar design conditions and construction material where by the expected type and rate of damage can reasonably be expected to be the same.
- NOTE: 1 Complex process units or piping systems are divided into piping circuits to manage the necessary inspections, data analysis, and record keeping.
- NOTE: 2 When establishing the boundary of a particular piping circuit, it may be sized to provide a practical package for record keeping and performing field inspection.
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