Inspections for in-service vessels that are still in operation that have not been performed by their due dates documented in the inspection plan, which have not been deferred by a documented deferral process. See 6.7.
Source: API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration, Tenth Edition, May 2014, with Addendum May 2017. Global Standards
Piping inspections for in-service equipment that have not been performed by their established due dates documented in the inspection schedule/plan and that do not have an approved deferral per 7.10. A piping system not currently in operation due to a process outage would not be considered overdue for inspection if its due date coincides with the time it is out-of-service; however, it would be overdue for inspection if it were placed back in-service before being inspected.
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