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The DNV Standard no. DNV-DS-E403 includes following chapters - General Information; Surface diving systems - Design philosophy and premises; Pressure vessels for gas storage, human occupancy, and other purposes; Life support systems including piping, valves, hoses, fittings, umbilicals and compressors; Electrical systems; Fire prevention, detection and extinction; LARS - Launch and recovery systems; Instrumentation and communications; Evacuation systems; Selection of safety objective. The declared objectives of the present standard were to give the guidance and applicable criteria on the design, manufacture, installation and testing/commissioning of the surface diving systems that employ air or nitrox as the breathing medium. It shall provide the standard of safety for such system that would be internationally acceptable, by means of defining the minimum requirements to the design/manufacture, installation and operation/maintenance and repair of these systems; it shall also serve as a technical reference book for classification and verification, as well as to assist in contractual matters between contractor and purchaser of the diving system; the standard can also be treated as a good guidebook for the designers, contractors and buyers of the above mentioned equipment.