API
API 574
Inspection Practices for Piping System Components
The practical companion to API 570 — what to look at on valves, fittings, flanges and supports, and how. Where the code sets requirements, this explains the inspection itself.
This is an explanation, not the standard. PipingInspector is not affiliated with API and reproduces no part of the document. Always work to the current edition of the standard itself and to your project specification.