EN250 Respiratory equipment - Open-circuit self-contained compressed air diving apparatus - Requirements, testing and marking

EN 250 Normative references

EN 144-1, Respiratory protective devices - Gas cylinder valves - Part 1: Thread connections for insert connector

EN 148-1, Respiratory protective devices - Threads for facepieces - Part 1: Standard thread connection

EN 148-2, Respiratory protective devices - Threads for facepieces - Part 2: Centre thread connection

EN 148-3, Respiratory protective devices - Threads for facepieces - Part 3: Thread connection M 45 x 3

EN 12021, Respiratory protective devices - Compressed air for breathing apparatus

EN ISO 12209, Gas cylinders - Outlet connections for gas cylinder valves for compressed breathable air (ISO 12209)

ISO 263, ISO inch screw threads — General plan and selection for screws, bolts and nuts — Diameter range 0,06 to 6 in

6Testing

6.1General

6.2Procedure

6.2.1General

6.2.2Nominal values and tolerances

6.2.3Breathable air

6.2.4Test equipment and calibration test procedures

6.3Visual inspection

6.4High and medium pressure parts and connections

6.5Hose assemblies

6.5.1General

6.5.2Tensile strength of high and medium pressure hose assemblies that may be subjected to

external tensile force

6.5.3Flexibility of high and medium pressure hoses

6.5.4Leakage of high pressure hose assembly

6.5.5Leakage of medium pressure hose assembly

6.5.6Burst pressure of high pressure hose assembly.

6.5.7Burst pressure of medium pressure hose assembly

6.5.8Kinking of medium pressure hoses

6.5.9Tensile load of breathing hose connections

6.6Pressure relief system

6.6.1Upstream demand valve

6.6.2Downstream demand valve

6.7Demand regulator

6.7.1General

6.7.2Cold water performance

6.8Exhalation valve

6.9Cylinder valve6.10Facepiece

6.10.1 Mouthpiece

6.10.2 Full face mask or oro-nasal half mask

6.10.3 Head harness

6.11Safety devices

6.11.1 Pressure indicator

6.11.2 Reserve valve

6.11.3 Other active warning device

6.12Resistance to specific temperatures

6.12.1 Testing after storage at +70 °C

6.12.2 Testing after storage at −30 °C

6.12.3 Testing at +55 °C

6.12.4 Testing at −20 °C

6.13Seawater resistance

6.14Practical performance

6.14.1 General

6.14.2 Test subject

6.14.3 Basic testing

6.14.4 Functional testing when diving

6.14.5 Pass/fail criteria

6.14.6 Report