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DNV-OSS-103 issued in 2012. Current changes; Principles/Procedures for Classification - intro, classification process, class maintenance, legal provisions etc.; Design and Construction Provisions - Main class - 1A1 MOU and OI floating offshore installation, supplementary requirements for service notations LNG (or LPG) Production Unit/Installation, LNG (LPG) Storage Unit/Installation, and LNG (LPG) Loading Unit/Installation optional class notations, additional class notations - requirements for special systems and equipment; Classification in Operation; Changes - Historic. The publication states the general terms and applicable procedures for assigning and maintaining the class status of such facilities, including the list of technical references that are to be used in the process of classification. Though this paper refers primarily to LNG and LPG, the principles outlined herein may be used for any other offshore facility such as those involving CNG (i.e. compressed natural gas) and GTL (gas-to-liquid) products. Note that this document applies to the floating steel structures and does not directly address concrete structures (please check DNV-OS-C503 for the requirements applicable to bottom-fixed and floating structures made of concrete).