I have worked in refineries where it was an Owner/User procedural requirement to physically disconnect a vessel or piping system, and create an air-gap, prior to being considered "Out of Service" and rendering the component exempt from inspection requirements. My question is: Is anyone aware of any API/ASME/etc. industry standard or recommended practice which references "Out of Service" (specifically utilizing air-gapping) as an exemption from inspection or corrosion monitoring? Thank you, in advance.
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