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11、 INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.260.20 ISBN 978-2-8322-2867-8 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 IEC 60079-10-1:2015 IEC 2015 CONTENTS FOREWORD .
12、 6 INTRODUCTION . 9 1 Scope 10 2 Normative references 10 3 Terms and definitions 11 4 General . 15 4.1 Safety principles . 15 4.2 Area classification objectives 16 4.3 Explosion risk assessment 16 4.4 Competence of Personnel . 17 5 Area classification methodology 17 5.1 General . 17 5.2 Classificati
13、on by sources of release method 18 5.3 Use of industry codes and national standards . 18 5.4 Simplified methods . 18 5.5 Combination of methods . 19 6 Release of flammable substance . 19 6.1 General . 19 6.2 Sources of release 19 6.3 Forms of release . 20 6.3.1 General . 20 6.3.2 Gaseous release . 2
14、1 6.3.3 Liquefied under pressure . 21 6.3.4 Liquefied by refrigeration . 22 6.3.5 Aerosols 22 6.3.6 Vapours . 22 6.3.7 Liquid releases 22 6.4 Ventilation (or air movement) and dilution . 23 6.5 Main types of ventilation . 23 6.5.1 General . 23 6.5.2 Natural ventilation 23 6.5.3 Artificial ventilatio
15、n 24 6.5.4 Degree of dilution 25 7 Type of zone . 26 7.1 General . 26 7.2 Influence of grade of the source of release . 26 7.3 Influence of dilution . 27 7.4 Influence of availability of ventilation . 27 8 Extent of zone . 27 9 Documentation 28 9.1 General . 28 9.2 Drawings, data sheets and tables .
16、 28 Annex A (informative) Suggested presentation of hazardous areas 30 A.1 Hazardous area zones Preferred symbols 30 A.2 Hazardous area suggested shapes . 33 IEC 60079-10-1:2015 IEC 2015 3 Annex B (informative) Estimation of sources of release 35 B.1 Symbols 35 B.2 Examples of grade of release 35 B.
17、2.1 General . 35 B.2.2 Sources giving a continuous grade of release 35 B.2.3 Sources giving a primary grade of release . 36 B.2.4 Sources giving a secondary grade of release . 36 B.3 Assessment of grades of release 36 B.4 Summation of releases . 37 B.5 Hole size and source radius 38 B.6 Forms of rel
18、ease . 40 B.7 Release rate . 41 B.7.1 General . 41 B.7.2 Estimation of Release Rate . 41 B.7.3 Release rate of evaporative pools 44 B.8 Release from openings in buildings . 46 B.8.1 General . 46 B.8.2 Openings as possible sources of release . 46 B.8.3 Openings classification 46 Annex C (informative)
19、 Ventilation guidance 48 C.1 Symbols 48 C.2 General . 49 C.3 Assessment of ventilation and dilution and its influence on hazardous area 49 C.3.1 General . 49 C.3.2 Effectiveness of ventilation 50 C.3.3 Criteria for dilution . 50 C.3.4 Assessment of ventilation velocity . 51 C.3.5 Assessment of the d
20、egree of dilution . 52 C.3.6 Dilution in a room 53 C.3.7 Criteria for availability of ventilation . 55 C.4 Examples of ventilation arrangements and assessments . 56 C.4.1 Introduction . 56 C.4.2 Jet release in a large building 56 C.4.3 Jet release in a small naturally ventilated building . 57 C.4.4
21、Jet release in a small artificially ventilated building 57 C.4.5 Release with low velocity . 58 C.4.6 Fugitive emissions . 59 C.4.7 Local ventilation-extraction 59 C.5 Natural Ventilation in buildings 60 C.5.1 General . 60 C.5.2 Wind induced ventilation 60 C.5.3 Buoyancy induced ventilation. 61 C.5.
22、4 Combination of the natural ventilation induced by wind and buoyancy . 63 Annex D (informative) Estimation of hazardous zones 65 D.1 General . 65 D.2 Estimating types of the zones . 65 D.3 Estimating the extent of the hazardous zone . 65 Annex E (informative) Examples of hazardous area classificati
23、on 68 4 IEC 60079-10-1:2015 IEC 2015 E.1 General . 68 E.2 Examples 68 E.3 Example case study for area classification 83 Annex F (informative) Schematic approach to classification of hazardous areas 93 F.1 Schematic approach to classification of hazardous areas 93 F.2 Schematic approach to classifica
24、tion of hazardous areas 94 F.3 Schematic approach to classification of hazardous areas 95 F.4 Schematic approach to classification of hazardous areas 96 Annex G (informative) Flammable mists . 97 Annex H (informative) Hydrogen 99 Annex I (informative) Hybrid mixtures 101 I.1 General . 101 I.2 Use of
25、 ventilation 101 I.3 Concentration limits 101 I.4 Chemical reactions . 101 I.5 Energy/Temperature limits 101 I.6 Zoning requirements . 101 Annex J (informative) Useful equations in support to hazardous area classification 102 J.1 General . 102 J.2 Dilution with air of a flammable substance release 1
26、02 J.3 Estimate of the time required to dilute a flammable substance release 102 Annex K (informative) Industry codes and national standards 104 K.1 General . 104 Bibliography 106 Figure A.1 Preferred symbols for hazardous area zones 30 Figure A.2 Gas/vapour at low pressure (or at high pressure in c
27、ase of unpredictable release direction) 33 Figure A.3 Gas/vapour at high pressure . 33 Figure A.4 Liquefied gas 34 Figure A.5 Flammable liquid (non boiling evaporative pool) 34 Figure B.1 Forms of release . 40 Figure B.2 Volumetric evaporation rate of liquids . 45 Figure C.1 Chart for assessing the
28、degree of dilution . 52 Figure C.2 Self diffusion of an unimpeded high velocity jet release 57 Figure C.3 Supply only ventilation 58 Figure C.4 Supply and extraction ventilation 58 Figure C.5 Local extraction ventilation . 60 Figure C.6 Volumetric flow rate of fresh air per m 2of equivalent effectiv
29、e opening area 63 Figure C.7 Example of opposing ventilation driving forces . 64 Figure D.1 Chart for estimating hazardous area distances . 66 Figure E.1 Degree of dilution (Example No. 1) . 69 Figure E.2 Hazardous distance (Example No. 1) 70 Figure E.3 Zone classification (Example No. 1) 70 Figure
30、E.4 Degree of dilution (Example No. 2) . 72 IEC 60079-10-1:2015 IEC 2015 5 Figure E.5 Hazardous distance (Example No. 2) 73 Figure E.6 Degree of dilution (Example No. 3) . 75 Figure E.7 Hazardous distance (Example No. 3) 76 Figure E.8 Zones classification (Example No. 3) 76 Figure E.9 Degree of dilu
31、tion (Example No. 4) . 78 Figure E.10 Hazardous distance (Example No. 4) 79 Figure E.11 Zones classification (Example No. 4) 79 Figure E.12 Degree of dilution (Example No. 5) . 82 Figure E.13 Hazardous distance (Example No. 5) 83 Figure E.14 Enclosed compressor handling natural gas . 85 Figure E.15
32、Example of area classification for a compressor facility handling natural gas (elevation) 91 Figure E.16 Example of area classification for a compressor facility handling natural gas (plan) . 92 Figure F.1 Schematic approach to classification 93 Figure F.2 Schematic approach to classification for co
33、ntinuous grade releases 94 Figure F.3 Schematic approach to classification for primary grade releases . 95 Figure F.4 Schematic approach to classification for secondary grade releases 96 Table A.1 Hazardous area classification data sheet Part I: Flammable substance list and characteristics 31 Table
34、A.2 Hazardous area classification data sheet Part II: List of sources of release . 32 Table B.1 Suggested hole cross sections for secondary grade of releases . 39 Table B.2 Effect of hazardous zones on openings as possible sources of release . 47 Table C.1 Indicative outdoor ventilation velocities (
35、u w ) 52 Table D.1 Zones for grade of release and effectiveness of ventilation 65 Table E.1 Compressor facility handling natural gas 86 Table E.2 Hazardous area classification data sheet Part I: Flammable substance list and characteristics 88 Table E.3 Hazardous area classification data sheet Part I
36、I: List of sources of release (1 of 2) . 89 Table K.1 Examples of codes and standards 105 6 IEC 60079-10-1:2015 IEC 2015 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ EXPLOSIVE ATMOSPHERES Part 10-1: Classification of areas Explosive gas atmospheres FOREWORD 1) The International Electrotechnical Commi
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47、on may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60079-10-1 has been prepared by subcommittee 31J: Classification of hazardous areas and installation requirements, of IEC technical committee 31: Equipm
48、ent for explosive atmospheres. This second edition of IEC 60079-10-1 cancels and replaces the first edition, published in 2008, and constitutes a technical revision. The significant technical changes with respect to the previous edition are as follows: IEC 60079-10-1:2015 IEC 2015 7 Type Changes Cla
49、use Minor and editorial changes Extension Major technical changes Complete restructuring and dividing into sections to identify possible methodologies for classifying hazardous areas and to provide further explanation on specific assessment factors Main body of the text X X X Introducing new terms and the definitions 3 X Introducing clauses for alternative methods of area classification 5 X X Updating examples for presentat
