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BS EN 60079-10-2:2015 – TC:2020 Edition

BS EN 60079-10-2:2015 – TC:2020 Edition

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Tracked Changes. Explosive atmospheres – Classification of areas. Explosive dust atmospheres

Published By Publication Date Number of Pages
BSI 2020 76
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IEC 60079-10-2:2015 is available as IEC 60079-10-2:2015 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition. IEC 60079-10-2:2015 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 areas. 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 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 dust 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. Please refer to the foreword of the document for a detailed listing of the significant technical changes from the previous edition. Keywords: explosive dust atmospheres, combustible dust layers, ignition hazards

PDF Catalog

PDF Pages PDF Title
1 compares BS EN 60079-10-2:2015
2 TRACKED CHANGES
Text example 1 — indicates added text (in green)
5 Foreword
Endorsement notice
7 Annex ZA
(normative)
8 Annex ZB
(informative)
9 CONTENTS
12 • amended.
13 INTRODUCTION
14 EXPLOSIVE ATMOSPHERES –
1 Scope
15 2 Normative references
3 Terms and definitions
3.1
3.2
3.33.2
3.43.3
3.3
3.53.4
16 3.63.5
conductive dust
3.83.7
3.93.8
3.103.9
3.113.10
3.123.11
3.133.12
17 3.143.13
3.14
3.15
3.16
3.17
3.18
3.19
3.20
3.20
3.21
3.213.22
18 3.223.23
3.233.24
3.25.2
3.25.3
4 Area classification
4.1 General
19 4.2 Area classification procedure for explosive dust atmospheres
20 4.3 Competence of personnel
21 5 Sources of release
5.1 General
5.2 Dust containment
5.3 Identification and gradationgrading of sources of release
22 Table 1 – Designation of zones depending on presence of dust
6 Zones
6.1 General
6.2 Zones
23 6.36.2 Extent of zones
6.3.16.2.1 General
6.3.26.2.2 Zone 20
6.3.36.2.3 Zone 21
24 6.3.4 Zone 22
6.2.4 Zone 22
Table 1 – Designation of zones depending on presence of dust
25 7 Dust layer hazardlayers
8 Documentation
8.1 General
8.2 Drawings, data sheets and tables
8.2.1 Content of documents
26 8.2.2 Preferred Symbol key for area classification zones
27 Figure 1 – Identification of zones on drawings
28 A.1.1 General
A.1.1A.1.2 Zone 20
A.1.2A.1.3 Zone 21
A.1.3A.1.4 Zone 22
29 A.2 Bag emptying station within a building and without exhaust ventilation
30 Figure A.1 – Bag emptying station within a building and without exhaust ventilation
32 Figure A.2 – Bag emptying station with exhaust ventilation
34 Figure A.3 – Cyclone and filter with clean outlet outside building
36 Figure A.4 – Drum tipper within a building without exhaust ventilation
38 C.2B.2 Levels of housekeeping
40 Annex C
(informative)
C.1 General
C.2 Ventilation
C.3 Explosive limits
C.4 Chemical reactions
C.5 Minimum ignition parameters
C.6 Final classification
Where a hybrid mixture exists, consideration should be given to the assignment of both gas and dust zones to match the worst case requirement for both the gas and dust hazard. The worst case consequence should be considered when considering any EPL as…
41 Annex D
(informative)
Introduction of an alternative risk assessment method encompassing ‘equipment protection levels’ for Ex equipment
D.1 Introductory remarks
D.2 Historical background
D.3 General
42 D.3.1 Mines susceptible to firedamp (Group I)
D.3.1.2 EPL Mb
D.3.2 Gases (Group II)
D.3.2.2 EPL Gb
D.3.2.3 EPL Gc
D.3.3 Dusts (Group III)
D.3.3.2 EPL Db
D.3.3.3 EPL Dc
43 Table D.1 – Traditional relationship of EPLs to zones (no additional risk assessment)
Table D.2 – Description of risk of ignition protection provided
45 Bibliography
52 English
CONTENTS
54 INTRODUCTION
55 1 Scope
56 2 Normative references
3 Terms and definitions
59 4 Area classification
4.1 General
60 4.2 Area classification procedure for explosive dust atmospheres
61 4.3 Competence of personnel
5 Sources of release
5.1 General
5.2 Dust containment
5.3 Identification and grading of sources of release
62 6 Zones
6.1 General
6.2 Extent of zones
6.2.1 General
6.2.2 Zone 20
63 6.2.3 Zone 21
6.2.4 Zone 22
7 Dust layers
Tables
Table 1 – Designation of zones depending on presence of dust
64 8 Documentation
8.1 General
8.2 Drawings, data sheets and tables
8.2.1 Content of documents
65 8.2.2 Preferred Symbol key for area classification zones
Figures
Figure 1 – Identification of zones on drawings
66 Annex A (informative) Area classification examples
A.1 Examples of zones
A.1.1 General
A.1.2 Zone 20
A.1.3 Zone 21
A.1.4 Zone 22
67 A.2 Bag emptying station within a building and without exhaust ventilation
Figure A.1 – Bag emptying station within a building and without exhaust ventilation
68 A.3 Bag emptying station with exhaust ventilation
A.4 Cyclone and filter with clean outlet outside building
Figure A.2 – Bag emptying station with exhaust ventilation
69 A.5 Drum tipper within a building without exhaust ventilation
Figure A.3 – Cyclone and filter with clean outlet outside building
70 Figure A.4 – Drum tipper within a building without exhaust ventilation
71 Annex B (informative) Housekeeping
B.1 Introductory remarks
B.2 Levels of housekeeping
73 Annex C (informative) Hybrid mixtures
C.1 General
C.2 Ventilation
C.3 Explosive limits
C.4 Chemical reactions
C.5 Minimum ignition parameters
C.6 Final classification
74 Bibliography

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BS EN 60079-10-2:2015 - TC
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