IEC 60079-10-1:2008
(Main)Explosive atmospheres - Part 10-1: Classification of areas - Explosive gas atmospheres
Explosive atmospheres - Part 10-1: Classification of areas - Explosive gas atmospheres
IEC 60079-10-1:2008 is concerned with the classification of areas where flammable gas or vapour or mist hazards may arise and may then be used as a basis to support the proper selection and installation of equipment for use in a hazardous area. It is intended to be applied where there may be an ignition hazard due to the presence of flammable gas or vapour, mixed with air under normal atmospheric conditions, but it does not apply to
a) mines susceptible to firedamp;
b) the processing and manufacture of explosives;
c) areas where a hazard may arise due to the presence of combustible dusts or fibres;
d) catastrophic failures which are beyond the concept of abnormality;
e) rommos used for medial purposes;
f) domestic premises.
This first edition of IEC 60079-10-1 cancels and replaces the fourth edition of IEC 60079-10, published in 2002, and constitutes a technical revision. The significant technical changes with respect to the previous edition are:
- introduction of Annex D which deals with explosion hazard from flammable mists generated by the release under pressure of high flash point liquids;
- introduction of Clause A.3 (release rate) which gives thermodynamic equations for release rate with a number of examples for estimating release rate of fluids and gases.
Atmosphères explosives - Partie 10-1: Classement des emplacements - Atmosphères explosives gazeuses
La CEI 60079-10-1:2008 est relative au classement des emplacements dans lesquels des risques dus à des gaz, vapeurs ou brouillards inflammables peuvent apparaître, et ainsi constituer une base pour le choix et l'installation corrects du matériel utilisé dans de tels emplacements. Elle est destinée à être appliquée là où il peut exister un danger d'inflammation du fait de la présence de gaz ou vapeurs inflammables, en mélange avec l'air, dans les conditions atmosphériques normales; mais elle ne s'applique pas:
a) aux mines grisouteuses;
b) au traitement et à la fabrication des explosifs;
c) aux emplacements dans lesquels un danger dû à la présence de poussières ou fibres inflammables peut apparaître;
d) aux défaillances catastrophiques, qui dépassent le concept d'anormalité traité dans la présente norme;
e) aux locaux utilisés à des fins médicales;
f) aux locaux à usage domestique.
Cette première édition de la CEI 60079-10-1 annule et remplace la quatrième édition de la CEI 60079-10, publiée en 2002, et constitue une révision technique. Les principales modifications techniques suivantes ont été apportées par rapport à l'édition précédente:
- introduction de l'Annexe D qui traite du danger d'explosion du brouillard inflammable généré par l'échappement sous pression de liquides au point d'éclair élevé;
- introduction de l'Article A.3 (taux de dégagement) qui donne des équations thermodynamiques pour le taux de dégagement avec des exemples pour l'estimation du taux de dégagement des fluides et de gaz.
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Standards Content (Sample)
IEC 60079-10-1
Edition 1.0 2008-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 10-1: Classification of areas – Explosive gas atmospheres
Atmosphères explosives –
Partie 10-1: Classement des emplacements – Atmosphères explosives gazeuses
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IEC 60079-10-1
Edition 1.0 2008-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 10-1: Classification of areas – Explosive gas atmospheres
Atmosphères explosives –
Partie 10-1: Classement des emplacements – Atmosphères explosives gazeuses
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XB
CODE PRIX
ICS 29.260.20 ISBN 978-2-88910-043-9
– 2 – 60079-10-1 © IEC:2008
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.6
2 Normative references .7
3 Terms and definitions .7
4 General .10
4.1 Safety principles.10
4.2 Area classification objectives .11
5 Area classification procedure.12
5.1 General .12
5.2 Sources of release .12
5.3 Type of zone .13
5.4 Extent of zone .13
5.4.1 Release rate of gas or vapour.13
5.4.2 Lower explosive limit (LEL).14
5.4.3 Ventilation .14
5.4.4 Relative density of the gas or vapour when it is released.15
5.4.5 Other parameters to be considered.15
5.4.6 Illustrative examples.15
6 Ventilation .16
6.1 General .16
6.2 Main types of ventilation.16
6.3 Degree of ventilation .16
6.4 Availability of ventilation.17
7 Documentation .17
7.1 General .17
7.2 Drawings, data sheets and tables.17
Annex A (informative) Examples of sources of release and release rate .18
Annex B (informative) Ventilation.24
Annex C (informative) Examples of hazardous area classification .40
Annex D (informative) Flammable mists .63
Bibliography.65
Figure C.1 – Preferred symbols for hazardous area zones .41
Figure C.2 – Schematic approach to the classification of hazardous areas.62
Table A.1 – Effect of openings on grade of release .19
Table B.1 – Influence of independent ventilation on type of zone .31
Table B.2 – Procedure for summation of multiple releases within location V .32
o
Table B.3 – Procedure for summation of multiple primary grade releases .32
Table C.1 − Hazardous area classification data sheet – Part I: Flammable material list
and characteristics.60
Table C.2 − Hazardous area classification data sheet − Part II: List of sources of
release .61
60079-10-1 © IEC:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 10-1: Classification of areas –
Explosive gas atmospheres
FOREWORD
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International Standard IEC 60079-10-1 has been prepared by subcommittee 31J:
Classification of hazardous areas and installation requirements, of IEC technical committee
31: Equipment for explosive atmospheres.
This first edition of IEC 60079-10-1 cancels and replaces the fourth edition of IEC 60079-10,
published in 2002, and constitutes a technical revision.
The significant technical changes with respect to the previous edition are as follows:
• Introduction of Annex D which deals with explosion hazard from flammable mists
generated by the release under pressure of high flash point liquids.
• Introduction of Clause A.3 (release rate) which gives thermodynamic equations for release
rate with a number of examples for estimating release rate of fluids and gases.
– 4 – 60079-10-1 © IEC:2008
The text of this standard is based on the following documents:
FDIS Report on voting
31J/159/FDIS 31J/160/RVD
...
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