ISO 80079-36:2016

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)

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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













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.

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– 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

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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

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– 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

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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

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– 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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