ISO 80079-36:2016

Explosive atmospheres — Part 36: Non-electrical equipment for explosive atmospheres — Basic method and requirements

ISO 80079-36:2016 specifies the basic method and requirements for design, construction, testing and marking of non-electrical Ex equipment, Ex Components, protective systems, devices and assemblies of these products that have their own potential ignition sources and are intended for use in explosive atmospheres. Hand tools and manually operated equipment without energy storage are excluded from the scope of this standard. This standard does not address the safety of static autonomous process equipment when it is not part of equipment referred to in this standard. This standard does not specify requirements for safety, other than those directly related to the risk of ignition which may then lead to an explosion. The standard atmospheric conditions (relating to the explosion characteristics of the atmosphere) under which it may be assumed that equipment can be operated are: - temperature -20 °C to 60 °C; - pressure 80 kPa (0,8 bar) to 110 kPa (1,1 bar); and - air with normal oxygen content, typically 21 % v/v. Such atmospheres can also exist inside the equipment. In addition, the external atmosphere can be drawn inside the equipment by natural breathing produced as a result of fluctuations in the equipment's internal operating pressure, and/or temperature. This part of ISO/IEC 80079 specifies the requirements for the design and construction of equipment, intended for explosive atmospheres in conformity with all Equipment Protection Levels (EPLs) of Group I, II and III. This standard supplements and modifies the general requirements of IEC 60079-0, as shown in Table 1 in the Scope of the document. Keywords: mechanical explosion protected equipment

Atmosphères explosives — Partie 36: Appareils non électriques destinés à être utilisés en atmosphères explosives — Méthodologie et exigences

L'ISO 80079-36:2016 spécifie la méthodologie et les exigences de base pour la conception, la construction, les essais et le marquage des appareils Ex non électriques, des composants Ex, des systèmes de protection, des dispositifs et des assemblages de ces produits qui comportent leurs propres sources potentielles d'inflammation et qui sont destinés à être utilisés en atmosphères explosives. Les outils à main et les appareils à fonctionnement manuel sans stockage d'énergie sont exclus du domaine d'application de la présente norme. La présente norme ne traite pas de la sécurité des appareils de procédés autonomes statiques s'ils ne font pas partie des appareils auxquels la présente norme fait référence. La présente norme ne spécifie pas les exigences de sécurité autres que les exigences directement liées au risque d'inflammation pouvant entraîner une explosion. Les conditions atmosphériques normalisées (relatives aux caractéristiques d'explosion de l'atmosphère), selon lesquelles il peut être assumé que les appareils peuvent fonctionner sont les suivantes: - température de - 20 °C à 60 °C; - pression de 80 kPa (0,8 bar) à 110 kPa (1,1 bar); et - air avec teneur normale en oxygène, typiquement de 21 % v/v. De telles atmosphères peuvent également exister à l'intérieur de l'appareil. En outre, l'atmosphère externe peut être aspirée à l'intérieur de l'appareil par la respiration naturelle produite en raison des variations de pression de fonctionnement interne de l'appareil et/ou de la température. La présente partie de l'ISO/IEC 80079 définit les exigences relatives à la conception et à la construction des appareils destinés à être utilisés en atmosphères explosives en conformité avec tous les niveaux de protection de l'appareil (EPL) des Groupes I, II et III. Cette norme complète et modifie les exigences générales de l'IEC 60079-0 comme indiqué dans le Tableau 1 dans l'avant-propos du document. Mots clés: appareils mécaniques protégés contre l'explosion

General Information

• Status: Published
• Publication Date: 08-Mar-2016
• ICS: 29.260.20 - Electrical apparatus for explosive atmospheres
• Technical Committee: ISO/TMBG - Technical Management Board - groups
• Drafting Committee: ISO/TMBG - Technical Management Board - groups
• Parallel Committee: IEC/SC 31M - Non-electrical equipment and protective systems for explosive atmospheres
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 05-Jun-2021

Standards Content (Sample)

ISO 80079-36
Edition 1.0 2016-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 36: Non-electrical equipment for explosive atmospheres – Basic method
and requirements

Atmosphères explosives –
Partie 36: Appareils non électriques destinés à être utilisés en atmosphères
explosives – Méthodologie et exigences

ISO 80079-36:2016-02(en-fr)

---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2016 ISO, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in
any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet,
without prior written permission. Permission can be requested from either ISO at the address below or ISO’s member
body in the country of the requester.


Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie,
l’affichage sur l’internet ou sur un Intranet, sans autorisation écrite préalable. Les demandes d’autorisation peuvent
être adressées à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.

ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org

About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.


About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the

latest edition, a corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 15 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and

CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: [e-mail].


A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Catalogue IEC - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
Application autonome pour consulter tous les renseignements
Le premier dictionnaire en ligne de termes électroniques et
bibliographiques sur les Normes internationales,
électriques. Il contient 20 000 termes et définitions en anglais
Spécifications techniques, Rapports techniques et autres
et en français, ainsi que les termes équivalents dans 15
documents de l'IEC. Disponible pour PC, Mac OS, tablettes
langues additionnelles. Egalement appelé Vocabulaire
Android et iPad.
Electrotechnique International (IEV) en ligne.


Recherche de publications IEC - www.iec.ch/searchpub
Glossaire IEC - std.iec.ch/glossary
La recherche avancée permet de trouver des publications IEC 65 000 entrées terminologiques électrotechniques, en anglais
en utilisant différents critères (numéro de référence, texte, et en français, extraites des articles Termes et Définitions des
comité d’études,…). Elle donne aussi des informations sur les publications IEC parues depuis 2002. Plus certaines entrées
projets et les publications remplacées ou retirées. antérieures extraites des publications des CE 37, 77, 86 et

CISPR de l'IEC.
IEC Just Published - webstore.iec.ch/justpublished

Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications IEC. Just
Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur cette
Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:
[e-mail].

---------------------- Page: 2 ----------------------
ISO 80079-36


Edition 1.0 2016-02




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Explosive atmospheres –

Part 36: Non-electrical equipment for explosive atmospheres – Basic method

and requirements




Atmosphères explosives –

Partie 36: Appareils non électriques destinés à être utilisés en atmosphères


explosives – Méthodologie et exigences













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 13.230; 29.260.20 ISBN 978-2-8322-3202-6



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

---------------------- Page: 3 ----------------------
– 2 – ISO 80079-36:2016  ISO 2016
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references. 14
3 Terms and definitions . 15
4 EPL and equipment groups . 18
4.1 EPL . 18
4.2 Group I . 18
4.3 Group II . 18
4.4 Group III . 19
4.5 Equipment for specific explosive gas atmospheres . 19
5 Ignition hazard assessment . 19
5.1 General requirements . 19
5.2 Procedure of ignition hazard assessment . 20
5.2.1 Formal Ignition hazard identification and assessment . 20
5.2.2 Group I equipment assessment . 21
5.2.3 Group II and III equipment assessment . 21
5.2.4 Assessment with malfunctions . 22
5.2.5 Basic information necessary for the ignition hazard assessments . 22
5.2.6 Ignition hazard assessment report . 22
6 Assessment of possible ignition sources and control means . 23
6.1 General . 23
6.2 Hot surfaces . 23
6.2.1 General . 23
6.2.2 Ambient temperatures . 23
6.2.3 Establishing the maximum surface temperature . 23
6.2.4 Group I equipment . 24
6.2.5 Group II equipment . 24
6.2.6 Special cases for Group I and Group II equipment . 25
6.2.7 Group III equipment . 26
6.3 Flames and hot gases (including hot particles) . 26
6.4 Mechanically generated sparks and hot surfaces . 26
6.4.1 General . 26
6.4.2 Assessment of sparks generated by single impacts . 26
6.4.3 Assessment of sparks and hot surfaces generated by friction . 28
6.4.4 External equipment parts containing light metals. 29
6.5 Electrical ignition sources except stray current . 29
6.6 Stray electric currents, cathodic corrosion protection . 29
6.6.1 Internal sources . 29
6.6.2 External sources . 29
6.7 Static electricity. 29
6.7.1 General . 29
6.7.2 Connection facilities for earthing conducting parts . 30
6.7.3 Prevention of highly efficient charge generating mechanisms (leading to
propagating brush discharges on non-conductive layers and coatings) . 30
6.7.4 Equipment group I . 30

---------------------- Page: 4 ----------------------
ISO 80079-36:2016  ISO 2016 – 3 –
6.7.5 Equipment group II . 31
6.7.6 Equipment group III . 31
6.8 Adiabatic compression and shock waves . 32
6.9 Exothermic reactions, including self-ignition of dusts . 32
7 Additional considerations . 32
7.1 Dust deposits and other material in the gap of moving parts . 32
7.2 Dust deposits and other material in the flame arresters incorporated in the
equipment . 33
7.3 Opening times of enclosures . 33
7.4 Non-metallic enclosures and non-metallic parts of the equipment . 33
7.4.1 General . 33
7.4.2 Specification of the materials . 33
7.4.3 Thermal endurance . 33
7.5 Removable parts . 33
7.6 Materials used for cementing . 33
7.7 Light transmitting parts . 34
7.8 Stored energy . 34
8 Verification and tests . 34
8.1 General . 34
8.2 Determination of the maximum surface temperature . 34
8.2.1 General . 34
8.2.2 Hot Surface Ignition Test . 36
8.3 Mechanical tests . 37
8.3.1 Test for resistance to impact . 37
8.3.2 Drop test . 37
8.3.3 Required results . 37
8.4 Additional tests of non-metallic parts of the equipment relevant for explosion
protection . 37
8.4.1 Test temperatures . 37
8.4.2 Tests for Group I equipment . 37
8.4.3 Tests for Group II and III equipment . 38
8.4.4 Thermal endurance to heat . 38
8.4.5 Thermal endurance to cold . 39
8.4.6 Resistance to chemical substances for Group I equipment . 39
8.4.7 Mechanical resistance tests . 39
8.4.8 Surface resistance test of non-conductive parts of the equipment
relevant for explosion prevention and protection . 39
8.4.9 Thermal shock test . 39
9 Documentation . 39
9.1 Technical documentation . 39
9.2 Conformity with the documentation . 40
9.3 Certificate . 40
9.4 Responsibility for marking . 40
10 Instructions. 40
11 Marking . 41
11.1 Location . 41
11.2 General . 41
11.3 Warning markings . 42
11.4 Marking on very small equipment . 43

---------------------- Page: 5 ----------------------
– 4 – ISO 80079-36:2016  ISO 2016
11.5 Examples of marking . 43
Annex A (informative) Methodology for confirming the EPL . 44
A.1 Methodology for confirming the EPL of Group I . 44
A.1.1 EPL Ma . 44
A.1.2 EPL Mb . 44
A.2 Methodology for confirming the EPL of Group II and III . 44
A.2.1 EPL Ga and Da . 44
A.2.2 EPL Gb and Db . 44
A.2.3 EPL Gc and Dc . 44
Annex B (informative) Explanation of the ignition hazard assessment procedure . 45
B.1 Overview. 45
B.1.1 General . 45
B.1.2 Reporting with the help of a table . 45
B.2 Assessment Procedure . 45
B.3 Assessment Steps . 46
B.3.1 Identification of Ignition Hazards . 46
B.3.2 Determination of measures . 47
B.3.3 Concluding ignition hazard estimation and categorisation . 48
B.3.4 Determination of the EPL . 48
Annex C (informative) Examples of ignition hazard assessment . 49
C.1 General remarks . 49
C.2 Examples for common cases demonstrating the use of the scheme . 49
C.3 Example of an ignition hazard assessment for a pump . 56
C.4 Example of an ignition hazard assessment for an agitator . 60
Annex D (normative) Charging tests with non-conductive materials . 71
D.1 General . 71
D.2 Principle of the test . 71
D.3 Samples and apparatus . 72
D.4 Procedure . 72
D.4.1 Conditioning . 72
D.4.2 Determination of the most efficient charging method . 72
Annex E (informative) Consideration of misuse which can reasonably be anticipated
during ignition hazard assessment procedure . 76
E.1 General . 76
E.2 Identification and analysis of the ignition hazards . 76
E.3 First assessment of the ignition hazards . 76
E.4 Determination of safety measures . 76
E.5 Final assessment of the ignition hazards . 77
Annex F (informative) Development of different types of incendive electrostatic
discharges . 78
Annex G (normative) Protection concepts of types of protection "d", "p" and "t"
acceptable for non-electrical equipment . 79
Annex H (informative) Volume dependence of auto-ignition temperature . 80
Annex I (informative) Relationship between Equipment protection levels (EPLs) and
zones . 82
Bibliography . 83

Figure 1 – Relationship between ignition source definitions . 20

---------------------- Page: 6 ----------------------
ISO 80079-36:2016  ISO 2016 – 5 –
Figure D.1 – Rubbing with a pure polyamide cloth . 74
Figure D.2 – Discharging the charged surface of the test piece with a probe connected
to earth via a 0,1 µF capacitor . 74
Figure D.3 – Charging by the influence of a DC high voltage power . 75
Figure F.1 – Different types of incendive electrostatic discharges . 78
Figure H.1 – Volume dependence of auto-ignition temperature . 81

Table 1 – Applicability of specific clauses of IEC 60079-0 . 10
Table 2 – Classification of maximum surface temperatures for Group II equipment . 24
Table 3 – Assessment for temperature classification for small surface areas . 25
Table 4 – Single impact energy limits for EPL Ga . 28
Table 5 – Single impact energy limits for EPL Gb . 28
Table 6 – Single impact energy limits for EPL Gc . 28
Table 7 – Single impact energy limits for EPL Da, Db and Dc . 28
Table 8 – Permitted maximum projected areas for non-conductive parts of equipment
liable to become electrostatically charged . 31
Table 9 – Thermal endurance test . 38
Table 10 – Ambient temperature marking . 42
Table 11 – Text of warning markings . 42
Table B.1 –Table showing recommended documentation of an example of initial
assessment of equipment related ignition sources . 46
Table B.2 – Example for reporting of the identification of ignition hazards (step 1) and
the first assessment (step 2) . 47
Table B.3 – Example for reporting of the determination of protective measures (step 3)
and the concluding estimation and categorisation (step 4) . 48
Table C.1 – List of examples . 49
Table C.2 – Common cases demonstrating the use of the scheme – Electrostatic
discharge . 50
Table C.3 – Common cases demonstrating the use of the scheme – Hot surface . 52
Table C.4 – Common cases demonstrating the use of the scheme – Mechanical spark . 54
Table C.5 – Ignition hazard assessment report for a pump . 57
Table C.6 – Ignition hazard assessment report for an agitator . 61
Table H.1 – AITs of combustibles taken from IEC 60079-20-1 as contained in Figure H.1. . 80
Table I.1 – Relationship between Equipment protection levels (EPLs) and zones . 82

---------------------- Page: 7 ----------------------
– 6 – ISO 80079-36:2016  ISO 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

EXPLOSIVE ATMOSPHERES –

Part 36: Non-electrical equipment for explosive atmospheres –
Basic method and requirements

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may
...