The condition of a piping system whereby it is not in continuous operating service, i.e. it operates at regular or irregular intervals rather than continuously.
- NOTE: Occasional turnarounds or other infrequent maintenance outages in an otherwise continuous process service does not constitute intermittent service.
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