Home NR320 Certification scheme of materials and equipment for the classification of marine units This Rule Note provides requirements for the certification scheme for materials and equipment covered by the class and used or fitted on board units. Reference Title Edition NR320 R04 Certification scheme of materials and equipment for the classification of marine units Jul 2018 check related documents: NR216 Rules on materials and welding for the classification of marine units NR467 Rules for the classification of steel ships NR445 Rules for the classification of offshore units Check other Bureau Veritas rules and guidelines.