Home NR533 Approval of Service Suppliers This Rule Note provides requirements for approval and certification of service suppliers and is applicable to both initial and renewal audits providing services such as measurements, tests or maintenance of safety systems and equipment. ReferenceTitleDateNR533 R13Approval of service suppliersNovember 2024CHECK RELATED DOCUMENTS:NR467 Rules for the classification of steel shipsCheck other Bureau Veritas rules and guidelines.