Same or Similar Service

A designation where two or more pressure vessels are installed in parallel, comparable, or identical service and their process and environmental conditions have been consistent over a period of years based on the inspection criteria being assessed such that the damage mechanisms and rates of damage are comparable.

  • EXAMPLE: 1 Parallel service: A process or part of a process connected in parallel having comparable configuration with analogous and readily recognized similarities.
  • EXAMPLE: 2 Identical service: A designation where there is agreement that the configuration, process and operating regime, metallurgy, and environmental conditions are all the same, such that expected degradation characteristics are expected to be the same.

Source: API 510, Pressure Vessel Inspection Code: In-service Inspection, Rating, Repair, and Alteration, Tenth Edition, May 2014, with Addendum May 2017. Global Standards

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