1、Explosive atmospheresPart 10-1: Classification of areas Explosive gas atmospheresBS EN 60079-10-1:2015Incorporating corrigendum December 2016BSI Standards PublicationBS EN 60079-10-1:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 60079-10-1:2015. It is ide
2、ntical to IEC 60079-10-1:2015, incorporating corrigendum November 2015. It supersedes BS EN 60079-10-1:2009 which is withdrawn.IEC corrigendum November 2015 corrects Equation B.6.BSI, as a member of CENELEC, is obliged to publish EN 60079-10-1 as a British Standard. However, attention is drawn to th
3、e fact that during the documents development, the UK committee voted against its approval as a European Standard.The UK Committee has some concerns that the methodologies in the Informative Annexes C and D for determining zone type and extents have not been appropriately validated as required in Sec
4、tion 5.2., and suggest users consider the below issues when working with this standard: The ventilation rate (volume of air per unit time) relative to the releaserate of the flammable substance is the most important factor thatdetermines the ability of a release in an enclosure to become dilute. The
5、ventilation velocity has only a secondary effect: the UK Committeesview is that this is not adequately reflected in the standard. The extent of flammable gas or vapour from its point of release isdependent on the material being released, the release conditions(e.g. hole size and pressure) and the en
6、vironment into which it isbeing released (e.g. ventilation rate or weather conditions). Variousscientificallybased approaches exist for determining these zoneextents, including industry specific standards and dispersion models. EN 60079-10-1 places no limitations on a Zone 2 NE classification.Howeve
7、r the UK committee believes a Zone 2 NE classification wouldonly be applicable for a source pressure less than 10 barg which is thelimit accepted in other industry based guidance. For assessment of pool evaporation from volatile hydrocarbons, otherstandards and sources of information need to be used
8、 to cross-checkthe results to ensure that risks are reduced to as low as reasonablypracticable.The UK Committee will revisit these issues during the next revision cycle of this standard, rather than publishing a national annex as previously stated.The UK participation in its preparation was entruste
9、d by Technical Committee EXL/31, Equipment for explosive atmospheres, to Subcommittee EXL/31/3, Codes of practice.A list of organizations represented on this subcommittee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contra
10、ct. Users are responsible for its correct application. The British Standards Institution 2016. Published by BSI Standards Limited 2016ISBN 978 0 580 96948 5ICS 13.230; 29.260.20Compliance with a British Standard cannot confer immunity from legal obligations.BS EN 60079-10-1:2015BRITISH STANDARDThis
11、British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2016.Amendments/corrigenda issued since publicationDate Text affected31 December 2016 National foreword updatedThis page deliberately left blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE N
12、ORM EN 60079-10-1 December 2015 ICS 29.260.20 Supersedes EN 60079-10-1:2009English Version Explosive atmospheres - Part 10-1: Classification of areas - Explosive gas atmospheres (IEC 60079-10-1:2015 + COR1:2015) Atmosphres explosives - Partie 10-1: Classement des emplacements - Atmosphres explosives
13、 gazeuses (IEC 60079-10-1:2015 + COR1:2015) Explosionsgefhrdete Bereiche - Teil 10-1: Einteilung der Bereiche - Gasexplosionsgefhrdete Bereiche (IEC 60079-10-1:2015 + COR1:2015) This European Standard was approved by CENELEC on 2015-10-13. CENELEC members are bound to comply with the CEN/CENELEC Int
14、ernal 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 concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to an
15、y CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the of
16、ficial versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg
17、, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CEN
18、ELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 60079-10-1:2015 EIncorporating corrigendum November 2015EN 60079-10-1:2015 2 European foreword The text of document 31J/2
19、53/FDIS, future edition 2 of IEC 60079-10-1, prepared by SC 31J “Classification of hazardous areas and installation requirements“, of IEC/TC 31 “Equipment for explosive atmospheres“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60079-10-1:2015. The following dates are
20、fixed: g120 latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2016-07-13 g120 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2018-10-13 This document
21、 supersedes EN 60079-10-1:2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Stand
22、ard IEC 60079-10-1:2015 + COR1:2015 1)was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60079-10-2 NOTE Harmonized as EN 60079-10-2. IEC 61285:2004 NOTE Harmonized
23、as EN 61285:2004 (not modified). IEC 60079-20-1 NOTE Harmonized as EN 60079-20-1. 1) COR1:2015 applies to English version only. BS EN 60079-10-1:2015EN 60079-10-1:2015 3 Annex ZA (normative) Normative references to international publications with their corresponding European publications The followi
24、ng 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. NOTE 1 When an Int
25、ernational Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu. Publication Year Title EN/HD Year IEC 60079-0 - Exp
26、losive atmospheres - Part 0: Equipment - General requirements EN 60079-0 - IEC 60079-14 - Explosive atmospheres - Part 14: Electrical installations design, selection and erection EN 60079-14 - BS EN 60079-10-1:2015 2 IEC 60079-10-1:2015 IEC 2015 CONTENTS FOREWORD . 6 INTRODUCTION . 9 1 Scope 10 2 No
27、rmative 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 Classification by sources of release method 18
28、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 . 21 6.3.3 Liquefied under pressure .
29、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 ventilation 24 6.5.4 Degree of dilution 25 7
30、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 . 28 Annex A (informative) Suggested
31、 presentation of hazardous areas 30 A.1 Hazardous area zones Preferred symbols 30 A.2 Hazardous area suggested shapes . 33 BS EN 60079-10-1:2015IEC 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.2.1 General .
32、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 release . 40 B.7
33、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) Ventilation g
34、uidance 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 degree of dilut
35、ion . 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 Jet release in
36、 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.5.4 Combination
37、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 classification 68 BS EN 60
38、079-10-1:2015 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 cl
39、assification 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.
40、2 Use of 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 r
41、elease 102 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 press
42、ure in case 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 assess
43、ing the 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 m2of equivalent e
44、ffective 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
45、Figure E.4 Degree of dilution (Example No. 2) . 72 BS EN 60079-10-1:2015IEC 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)
46、76 Figure E.9 Degree of dilution (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 n
47、atural gas . 85 Figure E.15 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 appro
48、ach to classification for continuous 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 g16 Hazardous area classification data sheet Part I: Flammable substance li
49、st and characteristics 31 Table A.2 g16 Hazardous area classification data sheet g16 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 (uw) 52 Table D.1 Zones for grade of release and effectiveness of ventilation 65 Table E.1 Compressor facility han
