1、 IEC 60079-20-1Edition 1.0 2010-01INTERNATIONAL STANDARD NORME INTERNATIONALEExplosive atmospheres Part 20-1: Material characteristics for gas and vapour classification Test methods and data Atmosphres explosives Partie 20-1: Caractristiques des substances pour le classement des gaz et des vapeurs M
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16、s questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 60079-20-1Edition 1.0 2010-01INTERNATIONAL STANDARD NORME INTERNATIONALEExplosive atmospheres Part 20-1: Material characteristics for gas and vapour classification Test
17、methods and data Atmosphres explosives Partie 20-1: Caractristiques des substances pour le classement des gaz et des vapeurs Mthodes et donnes dessai INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XCICS 29.260.20 PRICE CODECODE PRIXISBN 2-8318-1076-2 Registered
18、trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 60079-20-1 IEC:2010 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 a
19、ccording to the maximum experimental safe gaps (MESG).7 4.3 Classification according to the minimum igniting currents (MIC) 8 4.4 Classification according to MESG and MIC8 4.5 Classification according to a similarity of chemical structure8 4.6 Classification of mixtures of gases 8 5 Data for flammab
20、le gases and vapours, relating to the use of equipment9 5.1 Determination of the properties .9 5.1.1 General .9 5.1.2 Equipment 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 Properti
21、es of particular gases and vapours10 5.2.1 Coke oven gas 10 5.2.2 Ethyl nitrite 10 5.2.3 MESG of carbon monoxide 10 5.2.4 Methane, Group IIA .11 6 Method of test for the maximum experimental safe gap 11 6.1 Outline of method11 6.2 Test apparatus 11 6.2.1 General .11 6.2.2 Mechanical strength 12 6.2.
22、3 Interior chamber 12 6.2.4 Exterior chamber .12 6.2.5 Gap adjustment .12 6.2.6 Injection 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
23、 6.3.5 Observation of the ignition process13 6.4 Determination of maximum experimental safe gap (MESG) .13 6.4.1 Preliminary tests13 6.4.2 Confirmatory tests .13 6.4.3 Reproducibility of maximum experimental safe gaps13 60079-20-1 IEC:2010 3 6.4.4 Tabulated values .13 6.5 Verification of the MESG de
24、termination method.14 7 Method of test 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
25、15 7.3.2 Observations .16 7.3.3 Subsequent 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) Furna
26、ces of test apparatus for the tests 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 Fig
27、ure A.4 Flask guide ring (board made 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
28、 class and range of auto-ignition temperatures10 Table 2 Values for verification of the apparatus .14 Table 3 Values for verification of the apparatus .17 4 60079-20-1 IEC:2010 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ EXPLOSIVE ATMOSPHERES Part 20-1: Material characteristics for gas and vapour cl
29、assification 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 question
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36、ies provide 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
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38、 expenses 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)
39、 Attention 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: Equipm
40、ent for explosive 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 editio
41、n of IEC 60079-20 (1996). It constitutes a technical revision. 60079-20-1 IEC:2010 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 on voting indic
42、ated 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 this publication
43、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. 6 60079-20-1 IEC:2010 EXPLOSIV
44、E 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 maximum experimental safe gaps (MESG) for
45、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 i
46、n the determination of the auto-ignition temperature of a chemically pure vapour or gas in air at atmospheric pressure. The tabulated values of chemical and engineering properties of substances are provided to assist engineers in their selection of equipment to be used in hazardous areas. It is hope
47、d to publish further data from time to time, as the results of tests made in several countries become available. The scope of these data has been selected with particular reference to the use of equipment in hazardous areas, and notice has been taken of standard measurement methods. NOTE 1 The data
48、in this standard have been taken from a number of references which are given in the bibliography. NOTE 2 Some variations in the data may appear when references are compared, but usually the discrepancy is sufficiently small to be of no importance in the selection of equipment. 2 Normative references
49、 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 amendments) applies. IEC 60079-11, Explosive atmospheres Part 11: Equipment protection by intrinsic safety “i“ IEC 60079-14, Explosive atmospheres Part 14: E
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