The standard provides a to requalification. It acknowledges that a bolted flange used on a drain line does not require the same rigor as a high-pressure separator on a hydrocarbon export line.
For valves and fittings, the threads wear out. A gate valve that opens fine on a bench may have 50% thread depth left. R-001 demands a thread gauge inspection. If the thread engagement is below 75% of original spec, the equipment is scrapped. norsok r001
If you are reusing a carbon steel flange originally bolted to a Monel heat exchanger, the flange likely suffered accelerated galvanic corrosion. R-001 requires you to inspect the interface points , not just the component in isolation. The standard provides a to requalification
A: While NORSOK standards are generally "voluntary" (guidelines), Equinor and the PSA have effectively made them mandatory for all new and life-extension projects on the NCS. If you don't follow R-001, you cannot get a consent to operate. This article is intended for informational purposes and reflects the current NORSOK R-001:2021 revision. Always consult the official standard document and applicable Norwegian regulations (SAFETY Regulations for the NCS) before performing requalification activities. A gate valve that opens fine on a