Standard
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AS/NZS 17420.4:2022
[Current]Respiratory protective devices — Performance requirements, Part 4: Requirements for supplied breathable gas RPD (ISO 17420-4:2021, MOD)
AS/NZS 17420.4:2022 adopts and modifies ISO 17420 4:2021 which specifies requirements for the performance and testing of supplied breathable gas respiratory protective devices (RPD) in accordance with their classification and for use in the workplace to protect the wearer from hazardous atmospheres and/or environments.
Published: 23/12/2022
Pages: 78
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, abbreviations and symbols
3.1 Terms and definitions
3.2 Abbreviated terms
3.3 Symbols
4 Classification overview
5 General requirements
5.1 General
5.2 Field of vision
5.3 Resistance to flame – Single burner dynamic
5.4 Compatibility with additional equipment
5.5 Monitor performance
5.6 Warning and checking device(s)
5.6.1 Performance of warning device(s)
5.6.2 Type Sxxxx RPD
5.6.3 Type Sxxxx RPD using generated breathable gas
5.6.4 Type SY RPD
5.6.5 Performance of checking device
5.7 Protection class determination
5.7.1 General
5.7.2 Total inward leakage (TIL)
5.8 Validation by practical performance
5.8.1 General
5.8.2 Donning/doffing
5.8.3 Communication performance - hearing and speech
5.8.4 Eye irritation caused by the RPD
5.8.5 Fogging of visor
5.8.6 Ergonomic requirements
5.8.7 Restriction and mobility of low pressure hose(s)
5.9 Requirements for elements/components
6 Requirements for supplied breathable gas RPD
6.1 Temperature of operation
6.2 RPD performance
6.2.1 General
6.2.2 Setting for RPD using compressed breathable air or gas mixtures for respiration only
6.2.3 Setting for RPD using regenerated breathable gas or RPD using enriched oxygen
6.3 Work of breathing (WoB), breathing resistance and elastance
6.4 Determination of capacity of type Sxxxx RPD
6.4.1 General
6.4.2 Type Sxxxx RPD having class T (tight fitting) RIs and using compressed breathable air or gas mixtures for respiration only
6.4.3 Type Sxxxx RPD having class L (loose fitting) RIs using compressed breathable gas
6.4.4 Type Sxxxx RPD - using generated breathable gas or using enriched oxygen
6.5 CO2 concentration limits
6.6 Temperature and humidity of inhaled breathable gas for regenerated breathable gas RPD and oxygen enriched breathable gas RPD
6.7 Contact with skin by hot and cold surface generated by the RPD
6.8 Oxygen content
6.8.1 Oxygen content of RPD using regenerated breathable gas
6.8.2 Oxygen content of RPD using oxygen enriched breathable gas
6.9 Noise limit
6.10 Assement of reliability
6.11 Pre-conditioning (Sequential/Non-sequential)
6.11.1 General
6.11.1.1 Sequential pre-conditioning
6.11.1.1.1 General
6.11.1.1.2 Exposure to temperature and humidity
6.11.1.1.3 Exposure to vibration and shock
6.11.1.1.3.1 Exposure to vibration
6.11.1.1.3.2 Exposure to shock
6.11.1.2 Exposure to corrosive atmosphere
6.12 Flexibility and resistance to deformation of hoses
6.12.1 General
6.12.2 Low pressure hose up to 2 m in length
6.12.3 Low pressure hose of 2 m or greater in length
6.12.4 Medium and high pressure hose greater than 2 m and up to 10 m in length
6.12.5 Medium and high pressure hose greater than 10 m in length
6.12.6 Flexibility of medium pressure hose
6.12.7 Flexibility of high pressure hose
6.12.8 Resistance to kinking of low, medium and high pressure hoses for use in a RPD with a hose length greater than 2 m
6.12.8.1 Corner kinking for hoses greater than 2 m and up to and including 10 m in length
6.12.8.2 Coil kinking for hose greater than 10 m in length
6.13 Compressed breathable gas cylinder and cylinder valve assemblies
6.13.1 General
6.13.2 Gas cylinder(s)
6.13.3 Cylinder valve(s)
6.13.3.1 General
6.13.3.2 Resistance to impact
6.13.3.3 Outlet connection of cylinder valve
6.13.3.3.1 Compressed breathable air
6.13.3.3.2 Compressed breathable oxygen
6.13.3.3.3 Compressed breathable oxygen enriched mixed gases
6.13.3.3.4 Liquid breathable gas
6.13.3.4 Cylinder valve operation
6.13.4 Control means (other than cylinder valve)
6.14 Connections
6.14.1 General
6.14.2 Operation of connections
6.14.3 Strength of connections
6.14.3.1 Connections to RI
6.14.3.2 Connections other than to the RI
6.14.3.3 High pressure hose connections
6.15 Combined and multi-functional RPD
6.15.1 Combined RPD
6.15.2 Multi-functional RPD
6.16 Requirements for optional features
6.16.1 General
6.16.2 Connectors
6.16.2.1 Outlet connection for rescue only
6.16.2.2 Inlet connection
6.16.2.3 Combined connection
6.16.2.4 Operation of connector
6.16.2.5 Disconnection
6.16.2.6 Stand-by position
6.16.3 Second high pressure outlet/inlet coupling requirements
6.16.4 Ambient air bypass performance
6.16.5 Extreme cold temperature requirements
6.16.5.1 General
6.16.5.2 Temperature of operation down to -50 °C
6.16.5.2.1 Working duration of temperature down to -50 °C
6.16.5.2.2 Flexibility of medium pressure hose down to -50 °C
6.16.5.2.3 Flexibility of high pressure hose down to -50 °C
6.16.5.2.4 Resistance of components down to -50 °C
6.16.6 Extreme high temperature requirements
6.16.7 Hydration
6.16.8 Submersion
6.16.9 Use of RPD in potentially explosive atmospheres
6.16.10 Electromagnetic compatibility of RPD
6.16.11 Permeation of medium pressure hoses for Class SY RPD, longer than 10 m including couplings
7 Testing
7.1 General
7.2 Inspection
7.3 Testing of leak tightness
7.3.1 Using positive pressure
7.3.2 Using negative pressure
7.4 High pressure leak-tightness test
7.5 Resistance to impact of cylinder valve
7.6 Testing permeation of medium pressure hoses
8 Marking
8.1 General
8.2 Marking of RPD without separable components
8.3 Marking of RPD replacement parts
8.4 Marking of RPD components as part of a system
8.4.1 RI
8.4.2 Other separable components
9 Information supplied by the RPD manufacturer
9.1 General
9.2 RPD
9.2.1 Minimum information
9.2.2 Additional information
9.2.3 Second high or medium pressure outlet/inlet
9.2.4 Ambient air bypass
9.2.5 Hydration facility
9.3 RPD components and replacement parts
9.3.1 RI
9.3.1.1 Minimum information
9.3.1.2 Additional informatiom
9.3.2 Other components or replacement parts
Annex A
A.1 General
A.2 Abrasion resistance
A.3 Pressure increase beyond the design limits
A.4 Exposure to dust
A.5 Compatibility of materials
A.5.1 General
A.5.2 Chemical resistance of materials
A.5.3 Oxygen compatibility
A.5.4 Compatibility of materials with the wearer’s body
A.6 Cleaning, disinfection and/or decontamination
Annex B
B.1 General
B.2 Procedure guidelines
B.3 Definitions and explanations
Annex C
C.1 General
C.2 Test schedules for tests using RPD headforms - allocation of RI sizes to headforms, number of samples and preconditioning
C.2.1 RI sizes
C.2.2 RPD headforms
C.2.2.1 General
C.2.2.2 How to read the Table C.1
C.2.2.3 Test schedules tables
C.3 Test schedules for tests not using headforms
C.3.1 General
C.3.2 Tests without test subjects (sample number 1 and 2)
C.4 Test with test subjects (sample number 3 to n)
C.5 Number of samples and test schedule for RPD Components
Annex D
D.1 General
D.2 Examples for normalization calculation for work of breathing
Bibliography
Appendix ZZ
ZZ.1 Scope
ZZ.2 Modifications
Cited references in this standard
[Current]
Electromagnetic compatibility (EMC) - Part 6-2: Generic standards - Immunity standard for industrial environments
[Current]
Classification of environmental conditions - Part 3-2: Classification of groups of environmental parameters and their severities - Transportation and Handling
IEC 60721-1:2002
Classification of environmental conditions — Part 1: Environmental parameters and their severities
[Current]
Environmental testing - Part 2-64: Tests - Test Fh: Vibration, broadband random and guidance
IEC 60068-2-27:2010
Environmental testing — Part 2-27: Tests — Test Ea and guidance: Shock
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