This revision was initiated to make this NORSOK standard compliant with changes in legislation and adapted to evolving and new technology. In this revision, the user will find that the standard has been completely reorganised and that the content and structure is different than the previous revision. The intention has been to make it easier to find information and provide flexibility to updating or revising this NORSOK standard in the future without altering its structure. Consequently, the changes from the previous revision are not marked.