1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 60079-20-1:2010Explosive atmospheresPart 20-1: Material characteristics for gas and vapour classification Test methods and dataIncorporating corrigendum July 2012BS EN 6007
2、9-20-1:2010National forewordThis British Standard is the UK implementation of EN 60079-20-1:2010. It is identical to IEC 60079-20-1:2010, incorporating corrigendum July 2012. It supersedes PD IEC 60079-20:2000, which is withdrawn.The start and finish of text introduced or altered by corrigendum is i
3、ndicated in the text by tags. Text altered by IEC corrigendum July 2012 is indicated in the text by .The UK participation in its preparation was entrusted to Technical Committee EXL/31, Equipment for explosive atmospheres.A list of organizations represented on this committee can be obtained on reque
4、st 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 2012. Published by BSI Standards Limited 2012.ISBN 978 0 580 80127 3 ICS 29.260.20 Compliance with a Briti
5、sh 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 2010.Amendments/corrigenda issued since publicationDate Text affected30 September 2012 Implementation of IEC corrigendum Ju
6、ly 2012BRITISH STANDARDEUROPEAN STANDARD EN 60079-20-1 NORME EUROPENNE EUROPISCHE NORM February 2010 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: Avenue Marnix 17,
7、 B - 1000 Brussels 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60079-20-1:2010 E ICS 29.260.20 English version Explosive atmospheres - Part 20-1: Material characteristics for gas and vapour classification - Test methods a
8、nd data (IEC 60079-20-1:2010) Atmosphres explosives - Partie 20-1: Caractristiques des substances pour le classement des gaz et des vapeurs - Mthodes et donnes dessai (CEI 60079-20-1:2010) Explosionsfhige Atmosphren - Teil 20-1: Stoffliche Eigenschaften zur Klassifizierung von Gasen und Dmpfen - Prf
9、methoden und Daten (IEC 60079-20-1:2010) This European Standard was approved by CENELEC on 2010-02-01. CENELEC 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 alterati
10、on. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by trans
11、lation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Es
12、tonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Foreword The text of document 31/837/FDIS, future edition 1 of I
13、EC 60079-20-1, prepared by IEC TC 31, Equipment for explosive atmospheres, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60079-20-1 on 2010-02-01. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
14、CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2010-11-01 latest date by which th
15、e national standards conflicting with the EN have to be withdrawn (dow) 2013-02-01 This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and covers essential requirements of EC Directive 94/9/EC. See Annex ZZ. Ann
16、exes ZA and ZZ have been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60079-20-1:2010 was approved by CENELEC as a European Standard without any modification. _ BS EN 60079-20-1:2010 EN 60079-20-1:2010 (E)Annex ZA (normative) Normative references to international
17、 publications with their corresponding European publications The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendment
18、s) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60079-11 - Explosive atmospheres - Part 11: Equipment protection by intrinsic safety “i“ EN 60079-11 - IEC 60079-14 - Ex
19、plosive atmospheres - Part 14: Electrical installations design, selection and erection EN 60079-14 - BS EN 60079-20-1:2010 EN 60079-20-1:2010 (E)Annex ZZ (informative) Coverage of Essential Requirements of EC Directives This European Standard has been prepared under a mandate given to CENELEC by the
20、 European Commission and the European Free Trade Association and within its scope the standard covers only the following essential requirements out of those given in Annex II of the EC Directive 94/9/EC: Essential Requirement 1.0.1 Essential Requirement 1.2.1, 1.2.3, 1.2.9 Essential Requirement 1.5.
21、7 Compliance with this standard provides one means of conformity with the specified essential requirements of the Directive(s) concerned. WARNING: Other requirements and other EC Directives may be applicable to the products falling within the scope of this standard. BS EN 60079-20-1:2010 EN 60079-20
22、-1:2010 (E) 2 CONTENTS FOREWORD. .4 1 Scope.6 2 Normative references 6 3 Terms and definitions 6 4 Classification of gases and vapours7 4.1 General . 7 4.2 Classification according to the maximum experimental safe gaps (MESG). .7 4.3 Classification according to the minimum igniting currents (MIC) .
23、8 4.4 Classification according to MESG and MIC. 8 4.5 Classification according to a similarity of chemical structure8 4.6 Classification of mixtures of gases .8 5 Data for flammable gases and vapours, relating to the use of equipment.9 5.1 Determination of the properties . .9 5.1.1 General 9 5.1.2 E
24、quipment group 9 5.1.3 Flammable limits 9 5.1.4 Flash point FP . .9 5.1.5 Temperature class . 10 5.1.6 Minimum igniting current (MIC) . 10 5.1.7 Auto-ignition temperature . . 10 5.2 Properties of particular gases and vapours. 10 5.2.1 Coke oven gas . . 10 5.2.2 Ethyl nitrite . 10 5.2.3 MESG of carbo
25、n monoxide . . 10 5.2.4 Methane, Group IIA . 11 6 Method of test for the maximum experimental safe gap . 11 6.1 Outline of method . 11 6.2 Test apparatus 11 6.2.1 General . 11 6.2.2 Mechanical strength . 12 6.2.3 Interior chamber . . 12 6.2.4 Exterior chamber . 12 6.2.5 Gap adjustment . 12 6.2.6 Inj
26、ection of mixture 12 6.2.7 Source of ignition 12 6.2.8 Materials of test apparatus . . 12 6.3 Procedure 12 6.3.1 Preparation of gas mixtures . 12 6.3.2 Temperature and pressure . . 12 6.3.3 Gap adjustment . 13 6.3.4 Ignition 13 6.3.5 Observation of the ignition process. 13 6.4 Determination of maxim
27、um experimental safe gap (MESG) . 13 6.4.1 Preliminary tests. . 13 6.4.2 Confirmatory tests . 13 6.4.3 Reproducibility of maximum experimental safe gaps . 13 BS EN 60079-20-1:2010 IEC 60079-20-1:2010 (E) 3 6.4.4 Tabulated values .13 6.5 Verification of the MESG determination method.14 7 Method of te
28、st for auto-ignition temperature .14 7.1 Outline of method14 7.2 Apparatus14 7.2.1 General .14 7.2.2 Test flask.14 7.2.3 Furnace.15 7.2.4 Thermocouples15 7.2.5 Sampling syringes or pipettes15 7.2.6 Timer.15 7.2.7 Mirror 15 7.3 Procedure .15 7.3.1 Sample injection 15 7.3.2 Observations .16 7.3.3 Subs
29、equent tests.16 7.3.4 Confirmatory tests .16 7.4 Auto-ignition temperature 16 7.5 Validity of results.16 7.5.1 Repeatability .16 7.5.2 Reproducibility.16 7.6 Data 17 7.7 Verification of the auto-ignition temperature determination method17 Annex A (normative) Furnaces of test apparatus for the tests
30、of auto-ignition temperature 18 Annex B (informative) Tabulated values.26 Bibliography77 Figure 1 Test apparatus.11 Figure A.1 Test apparatus: assembly.19 Figure A.2 Section A-A (flask omitted) .20 Figure A.3 Base heater (board made of refractory material) .20 Figure A.4 Flask guide ring (board made
31、 of refractory material) .21 Figure A.5 Neck heater (board made of refractory material) .22 Figure A.6 Furnace 23 Figure A.7 Lid of steel cylinder.24 Figure A.8 Lid of steel cylinder.25 Figure A.9 Injection of gaseous sample25 Table 1 Classification of temperature class and range of auto-ignition te
32、mperatures10 Table 2 Values for verification of the apparatus .14 Table 3 Values for verification of the apparatus .17 BS EN 60079-20-1:2010 IEC 60079-20-1:2010 (E) 4 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ EXPLOSIVE ATMOSPHERES Part 20-1: Material characteristics for gas and vapour classificati
33、on Test methods and data FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerni
34、ng standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their p
35、reparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates close
36、ly with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevan
37、t subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the tec
38、hnical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum ex
39、tent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provid
40、e conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or it
41、s directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses
42、arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention
43、 is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60079-20-1 has been prepared by IEC technical committee 31: Equipment for ex
44、plosive atmospheres. This first edition of IEC 60079-20-1 cancels and replaces the first edition of IEC 60079-1-1(2002), the second edition of IEC 60079-4 (1975), its amendment 1(1995) and its complement: IEC 60079-4A (1970), the first edition of IEC/TR 60079-12 (1978) and the first edition of IEC 6
45、0079-20 (1996). It constitutes a technical revision. BS EN 60079-20-1:2010 IEC 60079-20-1:2010 (E) 5 The text of this standard is based on the following documents: FDIS Report on voting 31/837/FDIS 31/855/RVD Full information on the voting for the approval of this standard can be found in the report
46、 on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 60079 series, under the general title: Explosives atmospheres can be found on the IEC website. The committee has decided that the contents of t
47、his publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. BS EN 60079-20
48、-1:2010 IEC 60079-20-1:2010 (E) 6 EXPLOSIVE ATMOSPHERES Part 20-1: Material characteristics for gas and vapour classification Test methods and data 1 Scope This part of IEC 60079 provides guidance on classification of gases and vapours. It describes a test method intended for the measurement of the
49、maximum experimental safe gaps (MESG) for gas- or vapour-air mixtures under normal conditions of temperature1and pressure so as to permit the selection of an appropriate group of equipment. The method does not take into account the possible effects of obstacles on the safe gaps2. This standard describes also a test method intended for use in the determination of the auto-ignition temperature of a chemically pure vapour or gas in air at atmospheric pressure. The tabulated val
