Clarification of "In-Service" versus "Out of Service"

[InspectorShain]

Is there a code reference which clarifies the definition of "Out of Service", in the context of rendering a pressurized component exempt from API 510/570/etc. Inspection requirements? Also, various refineries I've worked in performed "Out of Service" or "Abandoned in Place" equipment structural inspections to ensure they're not about to collapse. Some facilities I've worked within required a complete air-gap disconnection from all adjacent piping or equipment prior to identifying a component as "Out of Service", and thus eliminating routine scheduled inspection efforts. Are these type Owner/User self-implemented practices not addressed in any API or OSHA code? Thanks in advance.

 

[InspectorShain]

All right well several hours of searching the internet and code books led me to this one entry, from the NBIC code RB-3238 (1998 Interpretations):

INTERPRETATION 98-03
Subject: RB-3238 Interrupted Service
1998 Edition with the 1995 Addendum
Question
1:
Does paragraph RB-3238(f) of the NBIC define when a pressure vessel is
inservice or out-of-service?
Reply: No, the NBIC does not define out-of-service or in-service. This is subject to
jurisdictional requirements.

Out of curiosity, I then found this entry from New Jersey state law:

“Out-of-service” means any container, pipe, or equipment from which all liquid and sludge has been removed, all connecting lines and piping have been disconnected and blanked off, all valves (except for ventilation valves) have been closed and locked, and on which conspicuous signs have been posted that state that it is out of service and note the date of removal from service.

So I answered my own question, I think, but any additional input on the subject is welcomed.