The inspection and test plan for valve aticle provides you information about valve test and valve inspection in manufacturing shop.The draft Inspection and test plan for valve provided as well.
The Inspection and testing requirements for valves are covered in I4I Academy Online API 570 Piping Inspector Course in API RP 574 (Inspection Practices for Piping System Components) section.
You may need to review this sheet in conjunction of Third Party Inspection for Valve article.
The API 598, API 6D, API 594, ASME/ANSI B16.5, API 600, API 602, API 603, and API 604 standard requirements normally are applied for inspection and test plan in manufacturing shop.
The witness of some inspection and test by third party inspector is mandatory and cannot be waived.
Some others must only monitored and fully witnessing is not necessary, for these thing, the inspection man-days etc. depends to the purchaser decision, some prefer stringent monitoring and even assign resident inspector in manufacturing shop and some others relay to quality control system of the manufacture and assign only few days for monitoring points.
These are some of inspection points which need to be witnessed, monitored and reviewed by third party inspector in valve manufacture shop.