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BS EN 60079-2:2014:2018 Edition

BS EN 60079-2:2014:2018 Edition

$215.11

Explosive atmospheres – Equipment protection by pressurized enclosure “p”

Published By Publication Date Number of Pages
BSI 2018 82
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This part of IEC 60079 contains the specific requirements for the construction and testing of electrical equipment with pressurized enclosures, of type of protection “p”, intended for use in explosive gas atmospheres or explosive dust atmospheres. It also includes the requirements for pressurized enclosures containing a limited release of a flammable substance.

This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirements of this standard take precedence.

This standard does not include the requirements for:

  • pressurized enclosures where the containment system may release

    1. air with an oxygen content greater than normal, or

    2. oxygen in combination with inert gas where the oxygen is in a proportion greater than 21 %.

  • pressurized rooms or analyser houses; see IEC 60079-13;

  • pressurized enclosures used where “explosives” or pyrotechnics are present;

  • pressurized enclosures used where hybrid mixtures of gas/vapour and combustible dust are present;

  • pressurized enclosures used where pyrophoric substances such as explosives or propellants containing their own oxidizers are present

  • pressurized enclosures with an internal source of release of combustible dust.

NOTE When the user acts in the role of the manufacturer, it is typically the user’s responsibility to ensure that all relevant parts of this standard are applied to the manufacturing and testing of the equipment.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 Foreword
Endorsement notice
6 Annex ZA (normative) Normative references to international publications with their corresponding European publications
7 Annex ZZ (informative) Coverage of Essential Requirements of EU Directives
8 Annex ZY (informative) Significant changes between this European Standard and EN 60079-2:2007
12 Explanations:
A) Definitions
B) Information about the background of ‘major technical changes’
15 English
CONTENTS
20 FOREWORD
29 INTRODUCTION
30 1 Scope
2 Normative references
31 3 Terms and definitions
33 4 Protection levels
34 Tables
Table 1 – Determination of protection level
35 Table 2 – Design criteria based upon level of protection
36 5 Constructional requirements for pressurized enclosures
5.1 Enclosure
5.2 Materials
5.3 Doors and covers
5.3.1 Group I pressurized enclosures
5.3.2 Group I pressurized enclosures with static pressurization
5.3.3 Group II and Group III pressurized enclosures
37 5.3.4 Group II and Group III pressurized enclosures with static pressurization
5.3.5 Group II and Group III Level of Protection “pxb”
5.3.6 Group II and Group III Door and Cover warning
5.4 Mechanical strength
5.5 Group I and Group II Apertures, partitions, compartments and internal components
38 5.6 Apertures for Static Pressurization
5.7 Insulating materials for Group I equipment
5.8 Sealing
5.9 Spark and particle barriers
39 5.10 Cells and batteries
6 Temperature limits
6.1 General
6.2 For Level of Protection “pxb” or Level of Protection “pyb”
6.3 For Level of Protection “pzc”
7 Safety provisions and safety devices (except for static pressurization)
7.1 Suitability of safety devices for hazardous area
7.2 Integrity of safety devices
40 7.3 Provider of safety devices
7.4 Pressurization System evaluated as associated equipment
7.4.1 Pressurization systems for Level of Protection ”pzc”.
Table 3 – Safety devices based upon Level of Protection
41 7.4.2 Pressurization systems for Level of Protection ”pyb”.
7.4.3 Pressurization systems for Level of Protection ”pxb”.
7.5 Sequence diagram for Level of Protection “pxb”
7.6 Ratings for safety devices
7.7 Group I and Group II Purging automated for Level of Protection “pxb”
42 7.8 Group I or Group II  Purging criteria
7.9 Group III – Cleaning
7.10 Requirements when a minimum flow rate required
7.11 Safety devices to detect minimum overpressure
43 7.12 Value of minimum overpressure
44 7.13 Pressurizing multiple enclosures
7.14 Safety devices on doors and covers
7.15 Equipment that may remain energized
7.16 Equipment permitted within Level of Protection “pyb”
45 8 Safety provisions and safety devices for static pressurization
8.1 Suitability of safety devices for hazardous area
8.2 Protective gas
8.3 Internal sources of release
8.4 Group I and Group II Filling procedure
8.5 Group III Filling Procedure
8.6 Safety devices
8.7 Equipment that may remain energized
8.8 Overpressure
46 9 Supply of protective gas
9.1 Backup supply
9.2 Independent supplies
9.3 Type of gas
9.4 Temperature
10 Pressurized equipment with an internal source of release
11 Release conditions
11.1 No release
47 11.2 Limited release of a gas or vapour
11.3 Limited release of a liquid
12 Design requirements for the containment system
12.1 General design requirements
12.2 Infallible containment system
48 12.3 Containment system with a limited release
13 Protective gas and pressurizing techniques when there is an internal source of release
13.1 General
49 13.2 Pressurization with leakage compensation
13.2.1 No release
13.2.2 Limited release of a gas or liquid
13.3 Pressurization with dilution
13.3.1 General
13.3.2 No release
Table 4 – Protective gas requirements for a pressurized enclosure with a containment system
50 13.3.3 Limited release of a gas or vapour
13.3.4 Limited release of a liquid
14 Ignition-capable equipment
15 Internal hot surfaces
Table 5 – Equipment Protection Levels permitted within the dilution area based upon the Level of Protection of the pressurized enclosure
51 16 Type verification and tests
16.1 Determining the maximum overpressure rating
16.2 Maximum overpressure test
16.3 Leakage test
16.3.1 Other than static pressurization
16.3.2 Static pressurization
52 16.4 Purging test for pressurized enclosures with no internal source of release and filling procedure test for static pressurization
16.4.1 General
16.4.2 Pressurized enclosure where the protective gas is air
16.4.3 Pressurized enclosure where the protective gas is inert
16.4.4 Pressurized enclosure where the protective gas may be either air or an inert gas with a density equal to air ±10 %
16.4.5 Filling procedure test for a pressurized enclosure protected by static pressurization
16.5 Purging and dilution tests for a pressurized enclosure with an internal source of release
16.5.1 Test gas
53 16.5.2 Pressurized enclosure where the flammable substance has less than 2 % (V/V) oxygen and the protective gas is inert
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
54 16.5.4 Pressurized enclosure where the flammable substance is not a liquid, pressurization by continuous flow and the protective gas is air
16.6 Verification of minimum overpressure
55 16.7 Tests for an infallible containment system
16.7.1 Overpressure test
16.7.2 Infallibility test
16.8 Overpressure test for a containment system with a limited release
17 Routine tests
17.1 Functional test
17.2 Leakage test
17.3 Tests for an infallible containment system
17.4 Test for a containment system with a limited release
18 Marking
18.1 General
56 18.2 Identifying as pressurized
18.3 Supplementary marking
18.4 Internal source of release
18.5 Static pressurization
18.6 Pressurization systems
57 18.7 Warnings required in other clauses
18.8 Overpressure limited by user
18.9 Inert gas
Table 6 – Text of warning markings
58 19 Instructions
59 Annexes
Annex A (normative) Purging and dilution tests
A.1 General
A.2 Criteria for compliance where the protective gas is air
A.3 Criteria for compliance where the protective gas is inert
60 Annex B (informative) Examples of functional sequence diagram
Figures
Figure B.1 – State diagram of a leakage-compensation purge control system
Table B.1 – Truth table of a leakage-compensation purge control system
62 Annex C (informative) Examples of the changes in pressure in ducts and enclosures
63 Figure C.1 – Protective gas outlet
64 Figure C.2 – Pressurized enclosures with leakage compensation,enclosures without moving parts
65 Figure C.3 – Pressurized enclosures with leakage compensation, rotating electrical machine with an internal cooling fan
66 Figure C.4 – Pressurized enclosure with a leakage compensation, rotating electrical machine with an external cooling fan
67 Annex D (informative) Information to be provided to the user
D.1 General
D.2 Ducting of protective gas
D.2.1 Location of inlet
D.2.2 Ducting between pressurized enclosure and inlet
D.2.3 Outlets for protective gas
68 D.2.4 Additional purge time to account for ducting
D.2.5 Temperature of protective gas at the inlet
D.3 Power for protective gas supply
D.4 Static pressurization
D.5 Enclosures with a containment system
D.6 Enclosure maximum overpressure
69 Annex E (normative) Classification of the type of release within enclosures
E.1 General
E.2 No normal release, no abnormal release
E.3 No normal release, limited abnormal release
E.4 Limited normal release
70 Annex F (informative) Examples for the use of the dilution area concept
Figure F.1 – Diagram showing the use of the dilution area concept to simplify the purge and dilution test requirements
71 Figure F.2 – Diagram showing the use of the infallible containment system concept to simplify the purging and dilution requirements around ICE
Figure F.3 – Diagram showing the use of internal partitions around the potential source of release to simplify the purging and dilution requirements around ICE located outside the partitions
72 Annex G (normative) Internal Cells and Batteries for Level of Protection “pxb” and Level of Protection “pyb”
G.1 General Requirements
G.1.1 General
G.1.2 Accepted Electrochemical Systems
G.1.3 Secondary cells and secondary batteries
G.1.4 Mechanical Protection
73 G.2 Electrical Protection by energy limiting circuits.
G.2.1 Assessing as energy limited
G.2.2 Protective Components
G.2.3 Preventing excessive gas pressure
74 G.3 Additional requirements for Primary batteries
G.3.1 Prevention of reverse charging.
G.3.2 Prevention of accidental charging of primary batteries
Figure G.1 – Reverse charging protection
Figure G.2 – Accidental charging protection
75 G.4 Additional requirements for secondary batteries
G.4.1 Charging of secondary batteries inside the pressurized housing
G.5 Specific requirements for Inherently Safe (IhS) cells and batteries
76 G.6 Equipment located inside a pressurized enclosure connected to a battery which is also located inside the pressurized enclosure and not disconnected in the event of loss of pressurization
G.6.1 General
G.6.2 Circuit Isolation
G.6.3 Intrinsically safe battery or inherently safe battery used with “Ex” equipment
G.6.4 Intrinsically Safe or Inherently Safe battery with non-“Ex” equipment.
78 G.7 Supplementary marking and constructional requirements for pressurized enclosures containing one or more cells or batteries
G.7.1 General
G.7.2 Battery removal warning
G.7.3 Batteries requiring routine maintenance
G.8 Type tests
G.8.1 Voltage
G.8.2 Short circuit test for an Inherently Safe Cell or Battery
G.8.3 Full load test for other than Inherently safe batteries
79 Annex H (normative) Internal Cells and Batteries for Level of Protection “pzc”
H.1 General Requirements
H.1.1 General
H.1.2 Accepted Electrochemical Systems
H.1.3 Secondary cells and secondary batteries
H.1.4 Mechanical Protection
80 H.2 Equipment located inside a pressurized enclosure connected to a battery which is also located inside the pressurized enclosure and is not disconnected when power is removed from the enclosure.
H.3 Supplementary marking and constructional requirements for pressurized enclosures containing one or more cells or batteries
H.3.1 General
H.3.2 Battery removal warning
H.3.3 Batteries requiring routine maintenance
81 Bibliography

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