BS EN 60079-10-2-2015 Explosive atmospheres Classification of areas Explosive dust atmospheres《爆炸性气体 区域分级 易燃灰尘气体》.pdf

1、BSI Standards PublicationExplosive atmospheresPart 10-2: Classification of areas Explosive dust atmospheresBS EN 60079-10-2:2015National forewordThis British Standard is the UK implementation of EN 60079-10-2:2015. It isidentical to IEC 60079-10-2:2015. It supersedes BS EN 60079-10-2:2009which is wi

2、thdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee EXL/31, Equipment for explosive atmospheres.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions o

3、fa contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 80696 4ICS 13.230; 29.260.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published

4、 under the authority of theStandards Policy and Strategy Committee on 31 March 2015.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60079-10-2:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60079-10-2 March 2015 ICS 29.260.20 Supersedes EN 60079-10-2:2

5、009 English Version Explosive atmospheres - Part 10-2: Classification of areas - Explosive dust atmospheres (IEC 60079-10-2:2015) Atmosphres explosives - Partie 10-2: Classement des emplacements - Atmosphres explosives poussireuses (IEC 60079-10-2:2015) Explosionsgefhrdete Bereiche - Teil 10-2: Eint

6、eilung der Bereiche - Staubexplosionsgefhrdete Bereiche (IEC 60079-10-2:2015) This European Standard was approved by CENELEC on 2015-02-20. 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 n

7、ational 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 CENELEC member. This European Standard exists in three official versions (English, French, German)

8、. 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 official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, B

9、ulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Swit

10、zerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CENELEC All rights of exploitation in

11、 any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 60079-10-2:2015 E BS EN 60079-10-2:2015EN 60079-10-2:2015 - 2 - Foreword The text of document 31J/244/FDIS, future edition 2 of IEC 60079-10-2, prepared by SC 31J “Classification of hazardous areas and installation requir

12、ements“ of IEC/TC 31 “Equipment for explosive atmospheres“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60079-10-2:2015. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national st

13、andard or by endorsement (dop) 2015-11-20 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2018-02-20 This document supersedes EN 60079-10-2:2009. Attention is drawn to the possibility that some of the elements of this document may be the subject o

14、f 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 Standard IEC 60079-10-2:2015 was approved by CENELEC as a European Standard without any modification. IEC 60079-2 NOTE Harmonized as EN 60

15、079-2. IEC 60079-11 NOTE Harmonized as EN 60079-11. IEC 60079-14 NOTE Harmonized as EN 60079-14. IEC 60079-28 NOTE Harmonized as EN 60079-28. IEC 60079-18 NOTE Harmonized as EN 60079-18. IEC 60079-31 NOTE Harmonized as EN 60079-31. IEC 60079-32-2 NOTE Harmonized as EN 60079-32-2. BS EN 60079-10-2:20

16、15- 3 - EN 60079-10-2:2015 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references,

17、 only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information

18、 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 (mod) - Explosive atmospheres - Part 0: Equipment - General requirements EN 60079-0 - +A11 2013 IEC 60079-10-1 - Explosive atmospheres - Part 10-1:

19、Classification of areas - Explosive gas atmospheres EN 60079-10-1 - ISO/IEC 80079-20-2 - Explosive atmospheres - Part 20-2: Material characteristics - Combustible dusts test methods - - BS EN 60079-10-2:2015 2 IEC 60079-10-2:2015 IEC 2015 CONTENTS INTRODUCTION . 7 1 Scope 8 2 Normative references 9

20、3 Terms and definitions 9 4 Area classification . 12 4.1 General . 12 4.2 Area classification procedure for explosive dust atmospheres . 13 4.3 Competence of personnel . 14 5 Sources of release. 14 5.1 General . 14 5.2 Dust containment 14 5.3 Identification and grading of sources of release 14 6 Zon

21、es 15 6.1 General . 15 6.2 Extent of zones . 15 6.2.1 General . 15 6.2.2 Zone 20 . 15 6.2.3 Zone 21 . 16 6.2.4 Zone 22 . 16 7 Dust layers 16 8 Documentation 17 8.1 General . 17 8.2 Drawings, data sheets and tables . 17 8.2.1 Content of documents 17 8.2.2 Preferred Symbol key for area classification

22、zones 18 Annex A (informative) Area classification examples . 19 A.1 Examples of zones 19 A.1.1 General . 19 A.1.2 Zone 20 . 19 A.1.3 Zone 21 . 19 A.1.4 Zone 22 . 19 A.2 Bag emptying station within a building and without exhaust ventilation 20 A.3 Bag emptying station with exhaust ventilation . 21 A

23、.4 Cyclone and filter with clean outlet outside building 21 A.5 Drum tipper within a building without exhaust ventilation . 22 Annex B (informative) Housekeeping . 24 B.1 Introductory remarks . 24 B.2 Levels of housekeeping 24 Annex C (informative) Hybrid mixtures . 26 C.1 General . 26 C.2 Ventilati

24、on. 26 C.3 Explosive limits . 26 C.4 Chemical reactions . 26 C.5 Minimum ignition parameters 26 BS EN 60079-10-2:2015IEC 60079-10-2:2015 IEC 2015 3 C.6 Final classification 26 Bibliography 27 Figure 1 Identification of zones on drawings 18 Figure A.1 Bag emptying station within a building and withou

25、t exhaust ventilation 20 Figure A.2 Bag emptying station with exhaust ventilation . 21 Figure A.3 Cyclone and filter with clean outlet outside building 22 Figure A.4 Drum tipper within a building without exhaust ventilation . 23 Table 1 Designation of zones depending on presence of dust 16 BS EN 600

26、79-10-2:2015IEC 60079-10-2:2015 IEC 2015 7 INTRODUCTION Dusts, as defined in this standard, are hazardous because when they are dispersed in air by any means they may form potentially explosive atmospheres. Furthermore, layers of dust may ignite and act as ignition sources for an explosive atmospher

27、e. This part of IEC 60079 gives guidance on the identification and classification of areas where such hazards from dust can arise. It sets out the essential criteria against which the ignition hazards can be assessed and gives guidance on the design and control parameters which can be used in order

28、to reduce such a hazard. General and special criteria are given for the process of identification and classification of hazardous areas. This standard contains an informative Annex A giving examples for classifying areas. BS EN 60079-10-2:2015 8 IEC 60079-10-2:2015 IEC 2015 EXPLOSIVE ATMOSPHERES Par

29、t 10-2: Classification of areas Explosive dust atmospheres 1 Scope This part of IEC 60079 is concerned with the identification and classification of areas where explosive dust atmospheres and combustible dust layers are present, in order to permit the proper assessment of ignition sources in such ar

30、eas. In this standard, explosive dust atmospheres and combustible dust layers are treated separately. In Clause 4, area classification for explosive dusts clouds is described, with dust layers acting as one of the possible sources of release. In Clause 7 other general considerations for dust layers

31、are described. The examples in this standard are based on a system of effective housekeeping being implemented in the plant to prevent dust layers from accumulating. Where effective housekeeping is not present, the area classification includes the possible formation of explosive dust clouds from dus

32、t layers. The principles of this standard can also be followed when combustible fibres or flyings might cause a hazard. This standard is intended to be applied where there can be a risk due to the presence of explosive dust atmospheres or combustible dust layers under normal atmospheric conditions (

33、see Note 1). NOTE 1 Atmospheric conditions include variations in pressure and temperature above and below reference levels of 101,3 kPa (1 013 mbar) and 20 C (293 K), provided that the variations have a negligible effect on the explosive properties of the combustible materials. It does not apply to

34、underground mining areas, dusts of explosives that do not require atmospheric oxygen for combustion such as pyrophoric substances, propellants, pyrotechnics, munitions, peroxides, oxidizers, water-reactive elements or compounds, or other similar materials. catastrophic failures which are beyond the

35、concept of abnormality dealt with in this standard, any risk arising from an emission of toxic gas from the dust. This standard does not apply to where a hazard might arise due to the presence of flammable gas or vapour, but the principles may be used in the assessment of a hybrid mixture (see also

36、IEC 60079-10-1). NOTE 2 Additional guidance on hybrid mixtures is provided in Annex C. This standard does not take into account the effects of consequential damage following a fire or an explosion. BS EN 60079-10-2:2015IEC 60079-10-2:2015 IEC 2015 9 2 Normative references The following documents, in

37、 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. IEC 60079-0, Explosive atmospheres

38、 Part 0: Equipment General requirements IEC 60079-10-1, Explosive atmospheres Part 10-1: Classification of areas Explosive gas atmospheres ISO/IEC 80079-20-2, Explosive Atmospheres Part 20-2: Material Characteristics Combustible dusts test methods13 Terms and definitions For the purposes of this doc

39、ument, the terms and definitions given in IEC 60079-0 and the following apply. NOTE Additional definitions applicable to explosive atmospheres can be found in IEC 60050-426. 3.1 area three-dimensional region or space 3.2 hybrid mixture mixture of a flammable gas or vapour with a dust 3.3 dust generi

40、c term including both combustible dust and combustible flyings 3.4 combustible dust finely divided solid particles, 500 m or less in nominal size, which may form an explosive mixture with air at atmospheric pressure and normal temperatures Note 1 to entry: This includes dust and grit as defined in I

41、SO 4225. Note 2 to entry: The term solid particles is intended to address particles in the solid phase and not the gaseous or liquid phase, but does not preclude a hollow particle. Note 3 to entry: Materials passing a U.S. No. 40 Standard sieve as defined in ASTM E 11-04 are considered to meet the 5

42、00 m criterion. Note 4 to entry: Combustible dust test methods can be found in ISO/IEC 80079-20-2. 3.5 explosive dust atmosphere mixture with air, under atmospheric conditions, of flammable substances in the form of dust, which, after ignition, permits self-sustaining propagation _ 1To be published.

43、 BS EN 60079-10-2:2015 10 IEC 60079-10-2:2015 IEC 2015 3.6 conductive dust combustible dust with electrical resistivity equal to or less than 103m Note 1 to entry: Conductive dust is classified as Group IIIC. 3.7 non-conductive dust combustible dust with electrical resistivity greater than 103m Note

44、 1 to entry: Non-conductive dust is classified as Group IIIB. 3.8 combustible flyings solid particles including fibers, greater than 500 m in nominal size, which may form an explosive mixture with air at atmospheric pressure and normal temperatures Note 1 to entry: Examples of flyings include rayon,

45、 cotton (including cotton linters and cotton waste) sisal, jute, hemp, cocoa fiber, okum and waste kapok. Note 2 to entry: Combustible flyings are classified as Group IIIA. 3.9 hazardous area (dust) area in which combustible dust, in the form of a cloud is present, or may be expected to be present,

46、in quantities such as to require special precautions for the construction, installation and use of equipment Note 1 to entry: Hazardous areas are divided into zones based upon the frequency and duration of the occurrence of explosive dust atmospheres (see 6.2 and 6.3). Note 2 to entry: The potential

47、 of creating an explosive dust cloud from a dust layer also needs to be considered. 3.10 non-hazardous area (dust) area in which combustible dust in the form of a cloud is not expected to be present in quantities such as to require special precautions for the construction, installation and use of eq

48、uipment 3.11 dust containment process equipment housing which is intended to handle, process, transport or store materials inside of it, while minimizing the risk of the release of dust to the surrounding atmosphere 3.12 source of dust release point or location from which dust may be released into t

49、he atmosphere Note 1 to entry: The source of dust release can be from a dust containment or from a dust layer. 3.13 continuous grade of release release which is continuous or is expected to occur frequently or for long periods 3.14 continuous formation of a dust cloud locations in which a dust cloud may exist continuously, or may be expected to continue for long periods or for short periods which occur frequently BS EN 60079-10-2:2015IEC 60079-10-2:2015 IEC 2015