Home NR529 Gas Fuelled Ships The provisions of the IGF Code incorporated in this Rule Note are applicable for classification, as applicable for the assignment of additional service feature gasfuel or dualfuel. Reference Title Date NR529 R03 Gas fuelled ships Jan 2020 check related documents: NR467 Rules for the classification of steel ships NR216 Rules on materials and welding for the classification of marine units NR320 Certification scheme of materials & equipment for the classification of marine units Check other Bureau Veritas rules and guidelines.