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DNV-OSS-104 issued in 2014. Current changes; Introduction; General regulations and conditions - Classification principles, procedures, and conditions; Materials and welding - Metallic materials, structural fabrication; Hull and equipment - Structural design, watertight integrity and stability, towing; Machinery systems and equipment - Marine, machinery and piping systems, electrical installations, area arrangements, control and communication systems and emergency shutdown, fire protection, enhanced systems; Certification - Procedures, machinery and system certification; Newbuilding survey - Intro, survey planning, fabrication of structures, commissioning process, deliverables; Classification in operation - Intro, general provisions and requirements for surveys, preparation and planning, periodical surveys, other surveys, permanently installed self-elevating units; Historic changes. The main and very important objective of the present DNV publication is to provide a concise yet complete overview of the technical standards relating to building and classing a conventional SEDU. Obviously, the information contained in the Rules will be of great use even when applied to the units classified by other societies.