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BS ISO 17420-4:2021

BS ISO 17420-4:2021

$215.11

Respiratory protective devices. Performance requirements – Requirements for supplied breathable gas RPD

Published By Publication Date Number of Pages
BSI 2021 84
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This document 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.

PDF Catalog

PDF Pages PDF Title
2 undefined
8 Foreword
9 Introduction
10 1 Scope
2 Normative references
11 3 Terms, definitions, abbreviations and symbols
3.1 Terms and definitions
12 3.2 Abbreviated terms
13 3.3 Symbols
4 Classification overview
14 5 General requirements
5.1 General
5.2 Field of vision
5.3 Resistance to flame ā€“ 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)
15 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
16 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
17 6 Requirements for supplied breathable gas RPD
6.1 Temperature of operation
6.2 RPD performance
6.2.1 General
19 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
20 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
21 6.4.3 Type Sxxxx RPD having class L (loose fitting) RIs using compressed breathable gas
22 6.4.4 Type Sxxxx RPD – using generated breathable gas or using enriched oxygen
23 6.5 CO2 concentration limits
24 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
25 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
26 6.11 Pre-conditioning (Sequential/Non-sequential)
6.11.1 General
28 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
29 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
30 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)
31 6.13.4 Control means (other than cylinder valve)
32 6.14 Connections
6.14.1 General
6.14.2 Operation of connections
6.14.3 Strength of connections
35 6.15 Combined and multi-functional RPD
6.15.1 Combined RPD
36 6.15.2 Multi-functional RPD
6.16 Requirements for optional features
6.16.1 General
6.16.2 Connectors
37 6.16.3 Second high pressure outlet/inlet coupling requirements
6.16.4 Ambient air bypass performance
38 6.16.5 Extreme cold temperature requirements
40 6.16.6 Extreme high temperature requirements
6.16.7 Hydration
41 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
42 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
43 7.4 High pressure leak-tightness test
7.5 Resistance to impact of cylinder valve
44 7.6 Testing permeation of medium pressure hoses
46 8 Marking
8.1 General
8.2 Marking of RPD without separable components
8.3 Marking of RPD replacement parts
47 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
48 9.2 RPD
9.2.1 Minimum information
9.2.2 Additional information
9.2.3 Second high or medium pressure outlet/inlet
49 9.2.4 Ambient air bypass
9.2.5 Hydration facility
9.3 RPD components and replacement parts
9.3.1 RI
50 9.3.2 Other components or replacement parts
51 Annex A (informative) Reliability
53 Annex B (informative) Example of failure modes and effect analysis (FMEA)
57 Annex C (normative) Test schedules
80 Annex D (normative) Normalisation of test results
82 Bibliography

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BS ISO 17420-4:2021
$215.11