1、 IEC 60079-2 Edition 6.0 2014-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Explosive atmospheres Part 2: Equipment protection by pressurized enclosure “p“ Atmosphres explosives Partie 2: Protection du matriel par enveloppe surpression interne “p“ IEC 60079-2:2014-07(en-fr) THIS PUBLICATION IS COPY
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19、r des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 60079-2 Edition 6.0 2014-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Explosive atmospheres Part 2: Equipment protection by pressurized enclosure “p“ Atmosphres explosives Partie 2: Protection du
20、matriel par enveloppe surpression interne “p“ INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XB ICS 29.260.20 PRICE CODE CODE PRIX ISBN 978-2-8322-1746-7 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrot
21、echnique Internationale 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 agr. 2 IEC 60079-2:2014 2014 CONTENTS FOREWORD . 7 INTRODUCTION . 14 1 Scope 15 2 Normative refere
22、nces 15 3 Terms and definitions 16 4 Protection levels 18 5 Constructional requirements for pressurized enclosures 21 5.1 Enclosure . 21 5.2 Materials . 21 5.3 Doors and covers 21 5.3.1 Group I pressurized enclosures . 21 5.3.2 Group I pressurized enclosures with static pressurization 21 5.3.3 Group
23、 II and Group III pressurized enclosures . 21 5.3.4 Group II and Group III pressurized enclosures with static pressurization 22 5.3.5 Group II and Group III Level of Protection “pxb” . 22 5.3.6 Group II and Group III Door and Cover warning . 22 5.4 Mechanical strength 22 5.5 Group I and Group II Ape
24、rtures, partitions, compartments and internal components 22 5.6 Apertures for Static Pressurization 23 5.7 Insulating materials for Group I equipment 23 5.8 Sealing . 23 5.9 Spark and particle barriers 23 5.10 Cells and batteries 24 6 Temperature limits . 24 6.1 General . 24 6.2 For Level of Protect
25、ion “pxb” or Level of Protection “pyb” 24 6.3 For Level of Protection “pzc” . 24 7 Safety provisions and safety devices (except for static pressurization) 24 7.1 Suitability of safety devices for hazardous area 24 7.2 Integrity of safety devices . 24 7.3 Provider of safety devices . 25 7.4 Pressuriz
26、ation System evaluated as associated equipment . 25 7.4.1 Pressurization systems for Level of Protection ”pzc”. . 25 7.4.2 Pressurization systems for Level of Protection ”pyb”. . 26 7.4.3 Pressurization systems for Level of Protection ”pxb”. . 26 7.5 Sequence diagram for Level of Protection “pxb” 26
27、 7.6 Ratings for safety devices . 26 7.7 Group I and Group II Purging automated for Level of Protection “pxb” . 26 7.8 Group I or Group II Purging criteria 27 7.9 Group III Cleaning 27 7.10 Requirements when a minimum flow rate required 27 7.11 Safety devices to detect minimum overpressure 27 7.12 V
28、alue of minimum overpressure 28 7.13 Pressurizing multiple enclosures . 29 7.14 Safety devices on doors and covers 29 IEC 60079-2:2014 2014 3 7.15 Equipment that may remain energized 29 7.16 Equipment permitted within Level of Protection “pyb” 29 8 Safety provisions and safety devices for static pre
29、ssurization 30 8.1 Suitability of safety devices for hazardous area 30 8.2 Protective gas . 30 8.3 Internal sources of release 30 8.4 Group I and Group II Filling procedure 30 8.5 Group III Filling Procedure 30 8.6 Safety devices 30 8.7 Equipment that may remain energized 30 8.8 Overpressure 30 9 Su
30、pply of protective gas 31 9.1 Backup supply 31 9.2 Independent supplies 31 9.3 Type of gas . 31 9.4 Temperature . 31 10 Pressurized equipment with an internal source of release 31 11 Release conditions 31 11.1 No release 31 11.2 Limited release of a gas or vapour 32 11.3 Limited release of a liquid
31、. 32 12 Design requirements for the containment system . 32 12.1 General design requirements 32 12.2 Infallible containment system 32 12.3 Containment system with a limited release 33 13 Protective gas and pressurizing techniques when there is an internal source of release 33 13.1 General . 33 13.2
32、Pressurization with leakage compensation 34 13.2.1 No release . 34 13.2.2 Limited release of a gas or liquid . 34 13.3 Pressurization with dilution . 34 13.3.1 General . 34 13.3.2 No release . 34 13.3.3 Limited release of a gas or vapour . 35 13.3.4 Limited release of a liquid 35 14 Ignition-capable
33、 equipment 35 15 Internal hot surfaces 35 16 Type verification and tests . 36 16.1 Determining the maximum overpressure rating . 36 16.2 Maximum overpressure test 36 16.3 Leakage test . 36 16.3.1 Other than static pressurization . 36 16.3.2 Static pressurization 36 16.4 Purging test for pressurized
34、enclosures with no internal source of release and filling procedure test for static pressurization . 37 16.4.1 General . 37 16.4.2 Pressurized enclosure where the protective gas is air 37 4 IEC 60079-2:2014 2014 16.4.3 Pressurized enclosure where the protective gas is inert . 37 16.4.4 Pressurized e
35、nclosure where the protective gas may be either air or an inert gas with a density equal to air 10 % . 37 16.4.5 Filling procedure test for a pressurized enclosure protected by static pressurization 37 16.5 Purging and dilution tests for a pressurized enclosure with an internal source of release 37
36、16.5.1 Test gas 37 16.5.2 Pressurized enclosure where the flammable substance has less than 2 % (V/V) oxygen and the protective gas is inert 38 16.5.3 Pressurized enclosure with pressurization by continuous flow, containment system with less than 21 % (V/V) oxygen and the protective gas is inert 38
37、16.5.4 Pressurized enclosure where the flammable substance is not a liquid, pressurization by continuous flow and the protective gas is air 39 16.6 Verification of minimum overpressure . 39 16.7 Tests for an infallible containment system . 40 16.7.1 Overpressure test 40 16.7.2 Infallibility test . 4
38、0 16.8 Overpressure test for a containment system with a limited release 40 17 Routine tests . 40 17.1 Functional test 40 17.2 Leakage test . 40 17.3 Tests for an infallible containment system . 40 17.4 Test for a containment system with a limited release 40 18 Marking . 40 18.1 General . 40 18.2 Id
39、entifying as pressurized . 41 18.3 Supplementary marking 41 18.4 Internal source of release . 41 18.5 Static pressurization . 41 18.6 Pressurization systems . 41 18.7 Warnings required in other clauses . 42 18.8 Overpressure limited by user 42 18.9 Inert gas . 42 19 Instructions 43 Annex A (normativ
40、e) Purging and dilution tests 44 A.1 General . 44 A.2 Criteria for compliance where the protective gas is air 44 A.3 Criteria for compliance where the protective gas is inert . 44 Annex B (informative) Examples of functional sequence diagram . 45 Annex C (informative) Examples of the changes in pres
41、sure in ducts and enclosures 47 Annex D (informative) Information to be provided to the user . 52 D.1 General . 52 D.2 Ducting of protective gas 52 D.2.1 Location of inlet . 52 D.2.2 Ducting between pressurized enclosure and inlet 52 D.2.3 Outlets for protective gas . 52 D.2.4 Additional purge time
42、to account for ducting 53 IEC 60079-2:2014 2014 5 D.2.5 Temperature of protective gas at the inlet 53 D.3 Power for protective gas supply 53 D.4 Static pressurization . 53 D.5 Enclosures with a containment system 53 D.6 Enclosure maximum overpressure 53 Annex E (normative) Classification of the type
43、 of release within enclosures . 54 E.1 General . 54 E.2 No normal release, no abnormal release . 54 E.3 No normal release, limited abnormal release. 54 E.4 Limited normal release 54 Annex F (informative) Examples for the use of the dilution area concept 55 Annex G (normative) Internal Cells and Batt
44、eries for Level of Protection “pxb” and Level of Protection “pyb” 57 G.1 General Requirements 57 G.1.1 General . 57 G.1.2 Accepted Electrochemical Systems . 57 G.1.3 Secondary cells and secondary batteries . 57 G.1.4 Mechanical Protection . 57 G.2 Electrical Protection by energy limiting circuits. .
45、 58 G.2.1 Assessing as energy limited 58 G.2.2 Protective Components 58 G.2.3 Preventing excessive gas pressure 58 G.3 Additional requirements for Primary batteries 59 G.3.1 Prevention of reverse charging. . 59 G.3.2 Prevention of accidental charging of primary batteries . 59 G.4 Additional requirem
46、ents for secondary batteries 60 G.4.1 Charging of secondary batteries inside the pressurized housing 60 G.5 Specific requirements for Inherently Safe (IhS) cells and batteries 60 G.6 Equipment located inside a pressurized enclosure connected to a battery which is also located inside the pressurized
47、enclosure and not disconnected in the event of loss of pressurization . 61 G.6.1 General . 61 G.6.2 Circuit Isolation 61 G.6.3 Intrinsically safe battery or inherently safe battery used with “Ex” equipment 61 G.6.4 Intrinsically Safe or Inherently Safe battery with non-“Ex“ equipment. 61 G.7 Supplem
48、entary marking and constructional requirements for pressurized enclosures containing one or more cells or batteries . 63 G.7.1 General . 63 G.7.2 Battery removal warning 63 G.7.3 Batteries requiring routine maintenance . 63 G.8 Type tests . 63 G.8.1 Voltage 63 G.8.2 Short circuit test for an Inheren
49、tly Safe Cell or Battery . 63 G.8.3 Full load test for other than Inherently safe batteries . 63 Annex H (normative) Internal Cells and Batteries for Level of Protection “pzc” 64 H.1 General Requirements 64 H.1.1 General . 64 H.1.2 Accepted Electrochemical Systems . 64 6 IEC 60079-2:2014 2014 H.1.3 Secondary cells and secondary batteries . 64 H.1.4 Mechanical Protection . 64 H.2 Equipment located inside a pressurized enclosure connected to a battery which
