1. Scope
2. Normative references
3. Terms and definitions
4. Protection levels
5. Constructional requirements for pressurized enclosures
5.1 Enclosure
5.2 Materials
5.3 Doors and covers
5.4 Mechanical strength
5.5 Group I and GroupII Apertures, partitions, compartments and internal components
5.6 Apertures for Static Pressurization
5.7 Insulating materials for Group Iequipment
5.8 Sealing
5.9 Spark and particle barriers
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
7.3 Provider of safety devices
7.4 Pressurization System evaluated as associated equipment
7.5 Sequence diagram for Level of Protection “pxb”
7.6 Ratings for safety devices
7.7 Group Iand Group II Purging automated fo rLevelof Protection “pxb”
7.8 Group I or Group II−Purging criteria
7.9 GroupIII – Cleaning
7.10 Requirements when a minimum flow rate required
7.11 Safety devices to detect minimum overpressure
7.12 Value of minimum overpressure
7.13 Pressurizing multiple enclosures
7.14 Safety devices ondoors and covers
7.15 Equipmentthatmay remain energized
7.16 Equipment permitted within Level ofProtection“pyb”
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
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
11.2 Limitedrelease 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
12.3 Containment system with a limitedrelease
13 Protective gas and pressurizing techniques when there is an internal source of release
13.1 General
13.2 Pressurization with leakage compensation
13.3 Pressurization with dilution
14 Ignition-capable equipment
15 Internal hot surfaces
16 Type verification and tests
16.1 Determining the maximum overpressure rating
16.2 Maximum overpressure test
16.3 Leakage test
16.4 Purging test for pressurized enclosures with no internal source of releaseand filling procedure test for static pressurization
16.5 Purging and dilution tests for a pressurized enclosure with an internal sourceof release
16.6 Verification of minimum overpressure
16.7 Tests for an infallible containment system
16.8 Overpressure test fora containment system with a limited release
17 Routine tests
17.1 Functional test
17.2 Leakage test
17.3 Tests foran infallible containmentsystem
17.4 Test for a containment system with a limited release
18 Marking
18.1 General
18.2 Identifying as pressurized
18.3 Supplementary marking
18.4 Internalsource of release
18.5 Static pressurization
18.6 Pressurization systems
18.8 Overpressure limited by user
18.9 Inert gas
19 Instructions
AnnexA
AnnexB
AnnexC
AnnexD
AnnexE
AnnexF
AnnexG
AnnexH
Bibliography
FigureB.1 –State diagram of a leakage-compensation purge control system
Figure C.1 –Protective gasoutlet
Figure C.2 –Pressurizedenclosureswith leakage compensation,enclosureswithout
Figure C.3 –Pressurizedenclosureswith leakage compensation,rotating electrical
Figure C.4 –Pressurized enclosure with a leakage compensation, rotating electrical
Figure F.1 –Diagram showing the use of the dilution area concept to simplifythe
Figure F.2 –Diagram showing the use of the infallible containment system conceptto
Figure F.3 –Diagramshowingthe use ofinternalpartitionsaroundthe potentialsourceofrelease tosimplifythe purging anddilution requirementsaround ICElocated outside
Figure G.1 –Reverse charging protection
Figure G.2 –Accidental charging protection
Table 1–Determination ofprotectionlevel
Table 2–Designcriteria based upon levelofprotection
Table 3–Safetydevicesbased upon LevelofProtection
Table 4–Protective gasrequirementsforapressurized enclosure witha containment
Table 5–EquipmentProtectionLevelspermitted within the dilutionareabased upon
Table 6–Textofwarning markings
TableB.1 –Truthtable ofaleakage-compensation purge control system
