This European Standard specifies minimum requirements for self-contained open-circuit compressed air underwater breathing apparatus and their sub-assemblies to ensure a minimum level of safe operation of the apparatus down to a maximum depth of 50 m.
EN 250:2014 Referenced Document
EN 12021:2014 Respiratory equipment - Compressed gases for breathing apparatus
EN 144-1:2000 Respiratory protective devices - Gas cylinder valves - Part 1: Thread connections for insert connector
EN 148-1:1999 Respiratory Protective Devices - Threads for Facepieces - Part 1: Standard Thread Connection
EN 148-2:1999 Respiratory protective devices - Threads for facepieces - Part 2: Centre thread connection
EN 148-3:1999 Respiratory protective devices - Threads for facepieces - Part 3: Thread connection M 45×3
EN ISO 12209:2013 Gas cylinders - Outlet connections for gas cylinder valves for compressed breathable air (Incorporates Amendment A1: 2016)
ISO 263:1973 ISO inch screw threads; General plan and selection for screws, bolts and nuts; Diameter range 0,06 to 6 in
EN 250:2014 history
2014EN 250:2014 Respiratory equipment - Open-circuit self-contained compressed air diving apparatus - Requirements@ testing and marking
2000EN 250:2000 Respiratory Equipment - Open-Circuit, Self-Contained, Compressed Air Diving Apparatus - Requirements Testing, Marking Includes Amendment A1:2006