AS/NZS 60079.10.2:2016
Explosive atmospheres - Part 10.2: Classification of areas - Explosive dust atmospheres
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. Identical to and reproduced from IEC 60079-10-2, Ed. 2.0:2015.
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CONTENTS
1 Scope
2 Normative references
3 Terms and definitions
4 Area classification
4.1 General
4.2 Area classification procedure for explosive dust atmospheres
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
6 Zones
6.1 General
6.2 Extent of zones
7 Dust layers
8 Documentation
8.1 General
8.2 Drawings, data sheets and tables
Annex A (informative) Area classification examples
A.1 Examples of zones
A.2 Bag emptying station within a building and without exhaust ventilation
A.3 Bag emptying station with exhaust ventilation
A.4 Cyclone and filter with clean outlet outside building
A.5 Drum tipper within a building without exhaust ventilation
Annex B (informative) Housekeeping
B.1 Introductory remarks
B.2 Levels of housekeeping
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
Bibliography
Figure 1 – Identification of zones on drawings
Figure A.1 – Bag emptying station within a building and without exhaust ventilation
Figure A.2 – Bag emptying station with exhaust ventilation
Figure A.3 – Cyclone and filter with clean outlet outside building
Figure A.4 – Drum tipper within a building without exhaust ventilation
Table 1 – Designation of zones depending on presence of dust
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CONTENTS
1 Scope
2 Normative references
3 Terms and definitions
4 Area classification
4.1 General
4.2 Area classification procedure for explosive dust atmospheres
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
6 Zones
6.1 General
6.2 Extent of zones
7 Dust layers
8 Documentation
8.1 General
8.2 Drawings, data sheets and tables
Annex A (informative) Area classification examples
A.1 Examples of zones
A.2 Bag emptying station within a building and without exhaust ventilation
A.3 Bag emptying station with exhaust ventilation
A.4 Cyclone and filter with clean outlet outside building
A.5 Drum tipper within a building without exhaust ventilation
Annex B (informative) Housekeeping
B.1 Introductory remarks
B.2 Levels of housekeeping
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
Bibliography
Figure 1 – Identification of zones on drawings
Figure A.1 – Bag emptying station within a building and without exhaust ventilation
Figure A.2 – Bag emptying station with exhaust ventilation
Figure A.3 – Cyclone and filter with clean outlet outside building
Figure A.4 – Drum tipper within a building without exhaust ventilation
Table 1 – Designation of zones depending on presence of dust
Previous versions
AS/NZS 60079.10.2:2016
Online Library subscription pricing
The cost of your subscription will depend on which standards you want to access, and how many people in your organisation need to be able to access the Online Library subscription at the same time (concurrent users). During your subscription period, we are also able to make any necessary changes and ensure you are aware of any pricing changes that result. For a quote, contact our Online Library team by emailing onlinelibrary@standards.govt.nz.