Home Rules Search Search by Filter by Sea-going ships-Ships systems and equipmentOffshore units-Offshore systems and equipmentNaval ShipsInland navigations vessels and installationsMarine renewable energiesMaterials and constructionStructural designIce and polar environmentPropulsion and environment Ref (NR/NI #) Reference Edition date 654 NI654 - Guidelines on conversion of ship to LNG as fuel 2019 Feb. 655 NI655 - LNG Carrier conversion to FSRU or FSU 2018 Jul. 657 NI657 - Classification scheme under risk based inspection 2019 Feb. 662 NI662 - Additive manufacturing - Guidelines for certification of product made using wire arc additive manufacturing (WAAM) process 2019 May. 663 NI663 - Propeller in Composite Materials 2020 Oct. 664 NI664 - Risk-Based Inspection for the Hull Structure of Floating Offshore Units 2021 Jun. 673 NI673 - Guidelines for Management of COVID-19 and Infectious Diseases 2020 Jun. 682 NI682 - Certification of Fixed Offshore Substations for Renewable Energy Projects 2022 Apr. 691 NI691 - Environmental Conditions, Loads and Induced Responses of Marine Units 2022 Dec.