Intermittent Service

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

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