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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.

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PDF Pages	PDF Title
4	Contents Page
7	Foreword
8	Introduction
9	1 Scope 2 Normative references 3 Terms and definitions
12	4 Minimum equipment 5 Requirements 5.1 Design 5.2 Auxiliary emergency breathing system
13	5.3 Materials 5.4 Air cylinder(s) 5.5 Cylinder valves
14	5.6 High pressure parts and connections Figure 1 — High-pressure male fitting, 7/16-20 thread, fitted with O-ring
15	Figure 2 — High pressure female fitting, 7/16-20 thread 5.7 Demand regulator performance 5.7.1 General
16	5.7.2 Cold water 5.7.3 Pressure reducer 5.7.4 Pressure relief system 5.7.4.1 Upstream demand valve 5.7.4.2 Downstream demand valve 5.7.5 Demand valve 5.7.6 Exhalation valve
17	5.8 Hose assemblies 5.8.1 Tensile strength of high and medium pressure hose assemblies that may be subjected to external tensile force 5.8.2 Flexibility of high and medium pressure hoses 5.8.3 Leakage of high pressure hose assembly 5.8.4 Leakage of medium pressure hose assembly 5.8.5 Burst pressure of high pressure hose assembly
18	5.8.6 Burst pressure of medium pressure hose assembly 5.8.7 Kinking of medium pressure hoses 5.8.8 Breathing hose 5.8.9 Length and arrangement of medium pressure hose assembly 5.9 Safety devices 5.9.1 General
19	5.9.2 Pressure indicator
20	5.9.3 Reserve valve (if fitted) 5.9.4 Other active warning devices 5.10 Facepiece 5.10.1 General
21	5.10.2 Inspired carbon dioxide 5.10.3 Mouthpiece assembly 5.10.4 Head harness 5.10.5 Full face mask or oro-nasal half mask 5.10.5.1 General
22	5.10.5.2 Visor(s) 5.11 Body harness
23	5.12 Resistance to temperature 5.12.1 Storage 5.12.2 Performance 5.12.3 Cold water performance 5.13 Cleaning and disinfection 5.14 Seawater resistance 5.15 Practical performance
24	6 Testing 6.1 General 6.2 Procedure 6.2.1 General 6.2.2 Nominal values and tolerances 6.2.3 Breathable air 6.2.4 Test equipment and calibration test procedures
25	Figure 3 — Calibration test orifice 6.3 Visual inspection 6.4 High and medium pressure parts and connections
26	6.5 Hose assemblies 6.5.1 General 6.5.2 Tensile strength of high and medium pressure hose assemblies that may be subjected to external tensile force 6.5.3 Flexibility of high and medium pressure hoses 6.5.4 Leakage of high pressure hose assembly 6.5.5 Leakage of medium pressure hose assembly 6.5.6 Burst pressure of high pressure hose assembly 6.5.7 Burst pressure of medium pressure hose assembly 6.5.8 Kinking of medium pressure hoses 6.5.9 Tensile load of breathing hose connections 6.6 Pressure relief system 6.6.1 Upstream demand valve
27	6.6.2 Downstream demand valve 6.7 Demand regulator 6.7.1 General 6.7.2 Cold water performance
28	6.8 Exhalation valve 6.9 Cylinder valve 6.10 Facepiece 6.10.1 Mouthpiece 6.10.2 Full face mask or oro-nasal half mask 6.10.2.1 Carbon dioxide content of the inhalation air
29	6.10.2.2 Mechanical strength of the facepiece connector Figure 4 — Test arrangement for tensile force 6.10.2.3 Field of vision
30	Figure 5 — Stoll Apertometer
31	Figure 6 — Apertometer diagram (not to scale)
32	6.10.2.4 Impact resistance of the visor(s) 6.10.3 Head harness 6.11 Safety devices 6.11.1 Pressure indicator 6.11.1.1 Pressure indicator connector 6.11.1.2 Pressure relief facility 6.11.1.3 Water leak test
33	6.11.2 Reserve valve 6.11.3 Other active warning device 6.12 Resistance to specific temperatures 6.12.1 Testing after storage at +70 C 6.12.2 Testing after storage at −30 C
34	6.12.3 Testing at +55 C 6.12.4 Testing at −20 C 6.13 Seawater resistance 6.14 Practical performance 6.14.1 General 6.14.2 Test subjects 6.14.3 Basic testing
35	6.14.4 Functional testing when diving
36	6.14.5 Pass/fail criteria 6.14.6 Report 7 Marking 7.1 General
37	7.2 Demand regulator 8 Information supplied by the manufacturer
39	Annex A (informative) Requirement clauses and corresponding test clauses of this European Standard Table A.1 — Comparison of requirement clauses and test clauses
41	Annex B (normative) Auxiliary emergency breathing system B.1 General B.2 Requirements B.3 Testing
42	B.4 Practical performance test
43	Annex C (informative) Artificial seawater
44	Annex D (informative) Details of significant technical changes between this European Standard and the previous edition
45	Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 89/686/EEC Table ZA.1 — Correspondence between this European Standard and Directive 89/686/EEC on Personal Protective Equipment

Status	Under Review
Pages	48
Publication Date	2014-04-30
ISBN	978 0 580 78797 3
Standard Number	BS EN 250:2014
Title	Respiratory equipment. Open-circuit self-contained compressed air diving apparatus. Requirements, testing and marking
Identical National Standard Of	EN 250:2014
Replaces	BS EN 250:2000
Descriptors	Thermal resistance, Pressure gauges, Harnesses, Depth, Laboratory testing, Pressure, Flexible pipes, Performance testing, Breathing apparatus, Gas cylinders, Maximum, Aquatic sports equipment, Valves, Instructions for use, Diving equipment, Pressure testing, Design, Marking, Underwater, Testing conditions, Simulation, Respirators, Safety devices, Cleaning, Conformity, Compressed air, Controllers, Health and safety requirements
Publisher	BSI
Committee	PH/4/7


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BS EN 250:2014

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