1、BSI Standards PublicationRespiratory equipment Compressed gases for breathing apparatusBS EN 12021:2014BS EN 12021:2014Incorporating corrigendum October 2014Incorporating corrigenda October 2014 and November 2014BS EN 12021:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implem
2、entation of EN 12021:2014. It supersedes BS EN 12021:1999, which is withdrawn. It partially supersedes BS 8478:2011, as the test methods in clause 5 specified in BS 8478:2011 have been retained.This European standard specifies that compressed gas for breathing shall not contain contaminants at a con
3、centration which can cause toxic or harmful effects and that all contaminants shall be kept to as low a level as possible. In the opinion of the UK committee, contaminants that are not listed in this standard may also be present for various reasons; including leakage of ambient contaminants into the
4、 face mask. In some cases the effects of these contaminants could be additive or even considerably greater than the sum of their individual effects. In addition, an individuals susceptibility to similar chemicals can vary significantly.In regards to the UK implementation of this standard, for compre
5、ssed breathing air, the concentration level of the contaminants should be as low as possible. For those contaminants that are not listed in this standard, the level should not be greater than one tenth of the relevant time (8 h) weighted average Workplace Exposure Limit (WEL). The UK National WEL fo
6、r substances hazardous to health are published by the Health and Safety Executive and can be found in the publication, Workplace Exposure limits (EH40).To ensure consistency in the application of this standard and in the analysis of the gases and any contaminants, a National Annex is included which
7、includes the test methods previously specified in BS 8478.The UK participation in its preparation was entrusted by Technical Committee PH/4, Respiratory protection, to Subcommittee PH/4/7, Underwater breathing apparatus.A list of organizations represented on this subcommittee can be obtained on requ
8、est to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2014. Published by BSI Standards Limited 2014ISBN 978 0 580 88584 6ICS 13.340.30Compliance with a British
9、 Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2014.Amendments/corrigenda issued since publicationDate Text affected31 October 2014 Correction to supersession details in na
10、tional foreword30 November 2014 Correction to paragraph 3 of the national forewordEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12021 April 2014 ICS 13.340.30 Supersedes EN 12021:1998English Version Respiratory equipment - Compressed gases for breathing apparatus Appareils de protection respi
11、ratoire - Gaz comprims pour appareil de protection respiratoire Atemgerte - Druckgase fr Atemschutzgerte This European Standard was approved by CEN on 6 February 2014. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European St
12、andard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning 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 (Engl
13、ish, French, German). A version in any other language made by translation under the responsibility of a CEN member into 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,
14、Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland
15、, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE 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 Memb
16、ers. Ref. No. EN 12021:2014 EBS EN 12021:2014EN 12021:2014 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Units 5 5 Reference conditions 5 6 Requirements .6 6.1 General 6 6.2 Breathing air .6 6.3 Mixing of gases 7 6.3.1 General 7 6.3.2 Oxygen compatibl
17、e air 7 6.3.3 Nitrogen depleted air and oxygen enriched air 8 6.3.4 Breathing oxygen.8 6.3.5 Oxygen and nitrogen gas mixtures 9 6.3.6 Oxygen and helium gas mixtures 9 6.3.7 Oxygen, helium and nitrogen gas mixtures . 10 6.3.8 Helium 11 6.4 Odour . 11 7 Sampling and testing . 11 8 Designation . 12 Ann
18、ex A (informative) Natural air 13 Annex B (informative) Details of significant technical changes between this European Standard and the previous edition 14 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 89/686/EEC . 15 Bibliography .
19、 16 BS EN 12021:2014EN 12021:2014 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Units 5 5 Reference conditions 5 6 Requirements .6 6.1 General 6 6.2 Breathing air .6 6.3 Mixing of gases 7 6.3.1 General 7 6.3.2 Oxygen compatible air 7 6.3.3 Nitrogen de
20、pleted air and oxygen enriched air 8 6.3.4 Breathing oxygen.8 6.3.5 Oxygen and nitrogen gas mixtures 9 6.3.6 Oxygen and helium gas mixtures 9 6.3.7 Oxygen, helium and nitrogen gas mixtures . 10 6.3.8 Helium 11 6.4 Odour . 11 7 Sampling and testing . 11 8 Designation . 12 Annex A (informative) Natura
21、l air 13 Annex B (informative) Details of significant technical changes between this European Standard and the previous edition 14 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 89/686/EEC . 15 Bibliography . 16 BS EN 12021:2014EN 12
22、021:2014 (E) 3 Foreword This document (EN 12021:2014) 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 publication of an identical text or b
23、y endorsement, at the latest by October 2014, and conflicting national standards shall be withdrawn at the latest by October 2014. 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 fo
24、r identifying any or all such patent rights. This document supersedes EN 12021:1998. Annex B provides details of significant technical changes between this European Standard and the previous edition. This document has been prepared under a mandate given to CEN by the European Commission and the Euro
25、pean 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 document. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following c
26、ountries 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, Malta, Netherlands, Norway,
27、 Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 12021:2014EN 12021:2014 (E) 4 1 Scope This European Standard specifies requirements for the quality of compressed gas supplied for mixing or use in respiratory protective devices and hype
28、r- and hypobaric operations. Account is taken of the use of compressed gases for normal atmospheric pressure as well as for hyper- and hypobaric pressures. This European Standard does not apply to compressed gases used for medical purposes or for aerospace applications. 2 Normative references The fo
29、llowing documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 132:1998,
30、Respiratory protective devices - Definitions of terms and pictograms 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 132:1998 and the following apply. 3.1 hydrocarbon organic compound consisting of hydrogen and carbon 3.2 oil mixture of hydrocarbons a
31、nd other organic compounds composed of six or more carbon atoms (C6+) 3.3 trimix gas comprising a specified mixture of oxygen, helium and nitrogen, capable of supporting human life under appropriate diving or hyperbaric conditions Note 1 to entry: This includes manufactured gas mixtures made up from
32、 combinations of pure oxygen, pure helium and pure nitrogen, with or without compressed air. 3.4 heliox gas comprising a specified mixture of oxygen and helium, capable of supporting human life under appropriate diving or hyperbaric conditions 3.5 oxygen and nitrogen gas mixture gas comprising a spe
33、cified mixture of oxygen and nitrogen, capable of supporting human life under appropriate diving or hyperbaric conditions Note 1 to entry: Oxygen and nitrogen gas mixtures are also known as “nitrox”. Note 2 to entry: This definition does not cover gas mixtures produced using oxygen compatible air or
34、 nitrogen depleted air. BS EN 12021:2014EN 12021:2014 (E) 4 1 Scope This European Standard specifies requirements for the quality of compressed gas supplied for mixing or use in respiratory protective devices and hyper- and hypobaric operations. Account is taken of the use of compressed gases for no
35、rmal atmospheric pressure as well as for hyper- and hypobaric pressures. This European Standard does not apply to compressed gases used for medical purposes or for aerospace applications. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document
36、 and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 132:1998, Respiratory protective devices - Definitions of terms and pictograms 3 Terms and de
37、finitions For the purposes of this document, the terms and definitions given in EN 132:1998 and the following apply. 3.1 hydrocarbon organic compound consisting of hydrogen and carbon 3.2 oil mixture of hydrocarbons and other organic compounds composed of six or more carbon atoms (C6+) 3.3 trimix ga
38、s comprising a specified mixture of oxygen, helium and nitrogen, capable of supporting human life under appropriate diving or hyperbaric conditions Note 1 to entry: This includes manufactured gas mixtures made up from combinations of pure oxygen, pure helium and pure nitrogen, with or without compre
39、ssed air. 3.4 heliox gas comprising a specified mixture of oxygen and helium, capable of supporting human life under appropriate diving or hyperbaric conditions 3.5 oxygen and nitrogen gas mixture gas comprising a specified mixture of oxygen and nitrogen, capable of supporting human life under appro
40、priate diving or hyperbaric conditions Note 1 to entry: Oxygen and nitrogen gas mixtures are also known as “nitrox”. Note 2 to entry: This definition does not cover gas mixtures produced using oxygen compatible air or nitrogen depleted air. BS EN 12021:2014EN 12021:2014 (E) 5 3.6 oxygen compatible a
41、ir compressed natural breathing air where the level of impurities has been reduced to make it suitable for use in gas mixtures including those containing oxygen concentrations greater than 22 % Note 1 to entry: Oxygen compatible air is also known in the diving industry as “oil free air”, “clean air”
42、 or “double filtered air”. 3.7 nitrogen depleted air oxygen compatible air from which some nitrogen has been removed to make it suitable for use in, or as, a gas mixture containing oxygen concentrations greater than 22 % Note 1 to entry: Nitrogen depleted air is also known as “nitrox”. 3.8 oxygen en
43、riched air compressed natural breathing air to which some oxygen has been added prior to compression and the level of some impurities reduced to make it suitable for use in or as a gas mixture containing oxygen concentrations greater than 22 % Note 1 to entry: Oxygen enriched air is also known as “n
44、itrox”. 3.9 dewpoint at a specified pressure, the temperature at, or below which, condensation from the gas phase will occur Note 1 to entry: This also includes frost point. 3.10 synthetic air mixture of oxygen and nitrogen that has an oxygen content of (21 1) % Note 1 to entry: Synthetic air is als
45、o known as “nitrox”. 4 Units General use of SI units (see ISO 80000) as given throughout this International Standard is recommended. However, in agreement with accepted practice, some non-preferred SI units accepted by ISO are also used. EXAMPLE 100 kPa = 1,00 bar. IMPORTANT The acronym ppm (parts p
46、er million) is used throughout the world to indicate the absolute content of a substance within a mixture. So in this case the ml m3equivalent notation “ppm” has been used in brackets in the tables. In this European Standard ppm is understood as concentration of a gas in parts per million per volume
47、. 5 Reference conditions All data given in the tables or required in this European Standard are valid for normal atmospheric pressure (1 013 mbar absolute, 20 C). All percentage requirements are given in % by volume (dry gas). All pressures in this European Standard are in bar absolute. Typical comp
48、osition of natural air is given in Annex A. BS EN 12021:2014EN 12021:2014 (E) 6 Maximum allowable concentrations of impurities for compressed gases are quoted as values calculated at normal atmospheric pressure. 6 Requirements 6.1 General Compressed gas for breathing shall not contain contaminants a
49、t a concentration which can cause toxic or harmful effects. In any event, all contaminants shall be kept to as low a level as possible and shall be less than one tenth of a national 8 h exposure limit. For breathing air only the limit shall be less than one sixth of a national 8 h exposure limit. For breathing at hyperbaric pressures greater than 10 bar or exposure times greater than 8 h the levels shall be revised to take into account the effects of pressure and exposure times. In the absence of more stringent national regulations, the values in Table 1 to Table 1
