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
The contents of the corrigendum of October 2019 have been included in this copy.

Atmosphères explosives - Partie 36: Appareils non électriques destinés à être utilisés en atmosphères explosives - Méthodologieet 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
Le contenu du corrigendum d'octobre 2019 a été pris en considération dans cet exemplaire.

General Information

Status
Published
Publication Date
25-Feb-2016
Current Stage
PPUB - Publication issued
Completion Date
26-Feb-2016
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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 ----------------------
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---------------------- 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

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