1、BSI Standards PublicationBS EN 250:2014Respiratory equipment Open-circuit self-containedcompressed air divingapparatus Requirements,testing and markingBS EN 250:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 250:2014. Itsupersedes BS EN 250:2000 which is w
2、ithdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PH/4/7, Underwater breathing apparatus.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a c
3、ontract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 78797 3ICS 13.340.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the au
4、thority of theStandards Policy and Strategy Committee on 30 April 2014.Amendments issued since publicationDate Text affectedBS EN 250:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 250 April 2014 ICS 13.340.30 Supersedes EN 250:2000English Version Respiratory equipment - Open-circuit self-
5、contained compressed air diving apparatus - Requirements, testing and marking Appareils respiratoires - Appareils de plonge autonomes air comprim et circuit ouvert - Exigences, essai et marquage Atemgerte - Autonome Leichttauchgerte mit Druckluft - Anforderungen, Prfung und Kennzeichnung This Europe
6、an Standard was approved by CEN on 3 February 2014. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references con
7、cerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member i
8、nto its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France,
9、 Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMIT
10、EE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 250:2014 EBS EN 250:2014EN 250:2014 (E) 2 Contents Page Foreword 5 Introduction .6 1 Scope 7 2 Norm
11、ative references 7 3 Terms and definitions .7 4 Minimum equipment . 10 5 Requirements 10 5.1 Design 10 5.2 Auxiliary emergency breathing system 10 5.3 Materials 11 5.4 Air cylinder(s) 11 5.5 Cylinder valves 11 5.6 High pressure parts and connections 12 5.7 Demand regulator performance 13 5.7.1 Gener
12、al . 13 5.7.2 Cold water 14 5.7.3 Pressure reducer 14 5.7.4 Pressure relief system . 14 5.7.5 Demand valve 14 5.7.6 Exhalation valve 14 5.8 Hose assemblies . 15 5.8.1 Tensile strength of high and medium pressure hose assemblies that may be subjected to external tensile force 15 5.8.2 Flexibility of
13、high and medium pressure hoses 15 5.8.3 Leakage of high pressure hose assembly . 15 5.8.4 Leakage of medium pressure hose assembly . 15 5.8.5 Burst pressure of high pressure hose assembly 15 5.8.6 Burst pressure of medium pressure hose assembly 16 5.8.7 Kinking of medium pressure hoses 16 5.8.8 Brea
14、thing hose 16 5.8.9 Length and arrangement of medium pressure hose assembly . 16 5.9 Safety devices . 16 5.9.1 General . 16 5.9.2 Pressure indicator 17 5.9.3 Reserve valve (if fitted) 18 5.9.4 Other active warning devices 18 5.10 Facepiece . 18 5.10.1 General . 18 5.10.2 Inspired carbon dioxide . 19
15、 5.10.3 Mouthpiece assembly 19 5.10.4 Head harness 19 5.10.5 Full face mask or oro-nasal half mask . 19 5.11 Body harness 20 5.12 Resistance to temperature . 21 5.12.1 Storage . 21 5.12.2 Performance 21 5.12.3 Cold water performance . 21 BS EN 250:2014EN 250:2014 (E) 3 5.13 Cleaning and disinfection
16、 . 21 5.14 Seawater resistance 21 5.15 Practical performance . 21 6 Testing 22 6.1 General . 22 6.2 Procedure . 22 6.2.1 General . 22 6.2.2 Nominal values and tolerances 22 6.2.3 Breathable air . 22 6.2.4 Test equipment and calibration test procedures . 22 6.3 Visual inspection . 23 6.4 High and med
17、ium pressure parts and connections 23 6.5 Hose assemblies . 24 6.5.1 General . 24 6.5.2 Tensile strength of high and medium pressure hose assemblies that may be subjected to external tensile force . 24 6.5.3 Flexibility of high and medium pressure hoses . 24 6.5.4 Leakage of high pressure hose assem
18、bly 24 6.5.5 Leakage of medium pressure hose assembly 24 6.5.6 Burst pressure of high pressure hose assembly . 24 6.5.7 Burst pressure of medium pressure hose assembly 24 6.5.8 Kinking of medium pressure hoses 24 6.5.9 Tensile load of breathing hose connections 24 6.6 Pressure relief system 24 6.6.1
19、 Upstream demand valve . 24 6.6.2 Downstream demand valve 25 6.7 Demand regulator 25 6.7.1 General . 25 6.7.2 Cold water performance . 25 6.8 Exhalation valve 26 6.9 Cylinder valve 26 6.10 Facepiece . 26 6.10.1 Mouthpiece . 26 6.10.2 Full face mask or oro-nasal half mask 26 6.10.3 Head harness . 30
20、6.11 Safety devices 30 6.11.1 Pressure indicator . 30 6.11.2 Reserve valve . 31 6.11.3 Other active warning device . 31 6.12 Resistance to specific temperatures . 31 6.12.1 Testing after storage at +70 C . 31 6.12.2 Testing after storage at 30 C . 31 6.12.3 Testing at +55 C . 32 6.12.4 Testing at 20
21、 C . 32 6.13 Seawater resistance 32 6.14 Practical performance . 32 6.14.1 General . 32 6.14.2 Test subjects 32 6.14.3 Basic testing 32 6.14.4 Functional testing when diving 33 6.14.5 Pass/fail criteria . 34 6.14.6 Report . 34 7 Marking . 34 7.1 General . 34 7.2 Demand regulator 35 BS EN 250:2014EN
22、250:2014 (E) 4 8 Information supplied by the manufacturer 35 Annex A (informative) Requirement clauses and corresponding test clauses of this European Standard . 37 Annex B (normative) Auxiliary emergency breathing system . 39 B.1 General . 39 B.2 Requirements 39 B.3 Testing . 39 B.4 Practical perfo
23、rmance test . 40 Annex C (informative) Artificial seawater 41 Annex D (informative) Details of significant technical changes between this European Standard and the previous edition 42 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 89
24、/686/EEC . 43 BS EN 250:2014EN 250:2014 (E) 5 Foreword This document (EN 250:2014) has been prepared by Technical Committee CEN/TC 79 “Respiratory protective devices”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publicat
25、ion of an identical text or by endorsement, at the latest by October 2014, and conflicting national standards shall be withdrawn at the latest by October 2014. This document supersedes EN 250:2000. Annex D provides details of significant technical changes between this European Standard and the previ
26、ous edition. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this doc
27、ument. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the national standards organ
28、izations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg,
29、Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 250:2014EN 250:2014 (E) 6 Introduction A given self-contained open-circuit compressed air underwater breathing apparatus can only be approved when the individua
30、l components satisfy the requirements of the test specification which may be a complete standard or part of a standard, and practical performance tests have been carried out successfully on complete apparatus where specified in the appropriate standard. If for any reason a complete apparatus is not
31、tested then simulation of the apparatus is permitted provided the respiratory characteristics are similar to those of the complete apparatus. BS EN 250:2014EN 250:2014 (E) 7 1 Scope This European Standard specifies minimum requirements for self-contained open-circuit compressed air underwater breath
32、ing apparatus and their sub-assemblies to ensure a minimum level of safe operation of the apparatus down to a maximum depth of 50 m. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated r
33、eferences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 144-1, Respiratory protective devices - Gas cylinder valves - Part 1: Thread connections for insert connector EN 148-1, Respiratory protective devic
34、es - 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 protectiv
35、e 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 3 Terms and definiti
36、ons For the purposes of this document the following terms and definitions apply. 3.1 self-contained, open-circuit Compressed air Underwater Breathing Apparatus SCUBA apparatus which has a portable supply of compressed air carried by the diver, allowing him to breathe under water and exhale into the
37、ambient water Note 1 to entry: The self-contained, open-circuit compressed air underwater breathing apparatus, when ready to use, consists of a number of compatible sub-assemblies each of which complies with the appropriate requirements of this standard. When connected together, the complete self-co
38、ntained, open-circuit compressed air underwater breathing apparatus is designed to enable the wearer to breathe air on demand from a high pressure cylinder (or cylinders) via a demand regulator connected to a facepiece. The exhaled air passes, without recirculation, from the demand regulator via the
39、 exhalation valve to ambient water. 3.2 high pressure pressure inside the cylinder(s) and between the cylinder(s) and any pressure reducer 3.3 medium pressure pressure between the pressure reducer and the demand valve BS EN 250:2014EN 250:2014 (E) 8 3.4 rated working pressure maximum working pressur
40、e of the respective components 3.5 reference pressure equilibrium pressure which exists in the face piece when there is no respiratory flow at the end of exhalation 3.6 respiratory pressure differential pressure in the face piece relative to the reference pressure measured during inhalation and exha
41、lation 3.7 opening negative pressure (cracking pressure) respiratory pressure during inhalation required to open the inhalation valve 3.8 displaced (tidal) volume volume of breathing gas displaced by the breathing simulator during one half cycle (inhalation or exhalation) measured in litres 3.9 brea
42、thing frequency setting of the breathing simulator measured in cycles per minute 3.10 Respiratory Minute Volume (RMV) product of the tidal volume and breathing frequency measured in litres per minute 3.11 pressure volume diagram diagram generated during one breathing cycle by plotting the respirator
43、y pressure against the displaced volume 3.12 Work Of Breathing (WOB) external work expended during one breath divided by the tidal volume of that breath, measured in Joule per litre, i.e. specific work Note 1 to entry: This is equivalent to volume average respiratory pressure (kPa). This work of bre
44、athing is, in general, proportional to the area bounded by the pressure volume diagram. Work associated with positive pressures during inhalation does not count towards the total work of breathing. 3.13 facepiece device that connects the apparatus to the wearers respiratory tract and isolates the re
45、spiratory tract from the environment Note 1 to entry: It may be a mouthpiece assembly, an oro-nasal half mask or a full face mask. 3.14 mouthpiece assembly device usually held by the teeth, sealing against the lips and through which air is inhaled and exhaled 3.15 full face mask facepiece covering m
46、outh, nose, eyes and chin which may be fitted with either a mouthpiece or an inner mask BS EN 250:2014EN 250:2014 (E) 9 3.16 oro-nasal half mask facepiece, covering mouth, nose and chin and retained by straps 3.17 dead space volume of the cavity formed between the mouth and the inhalation and exhala
47、tion parts 3.18 package of air cylinder(s) assembly of one or more air cylinders with cylinder valve(s) and a carrying frame (if applicable) 3.19 demand regulator device which consists of a pressure reducer connected to a demand valve that is fitted to a facepiece 3.20 demand valve that part of a de
48、mand regulator which reduces the medium pressure air to approximately ambient pressure 3.21 carrying system carrying frame or holding device for air cylinder(s) with possibility to mount the harness (if applicable) 3.22 pressure reducer that part of a demand regulator which reduces the high pressure
49、 air to medium pressure 3.23 auxiliary emergency breathing system additional breathing system as part of the apparatus Note 1 to entry: This can also be referred to as an octopus. 3.24 upstream demand valve demand valve that will close and not let gas out with an increasing medium pressure 3.25 downstream demand valve demand valve that will open and let gas out with an increasing medium pressure 3.26 dive/pre-dive control switch on the demand regulator that in the pre-dive position prevents free-flow when not connected to the respiratory tract 3.27 hose assemb
