ISO 4975:2022
Railway applications — Braking system — Quality of compressed air for pneumatic apparatus and systems
This document defines the quality classes of compressed air produced by air generation and treatment units (AGTUs) and/or used in pneumatic apparatus and systems of rail vehicles.
This document is applicable to compressed AGTUs and also to all pneumatic equipment and systems of rail vehicles.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Units and abbreviated terms
4.1 Units
4.2 Abbreviated terms
5 Compressed air system
5.1 General
5.2 Breakdown of the system into functional units
6 Characteristics of the devices constituting the functional units
6.1 Air generation and treatment unit (AGTU)
6.1.1 Air intake
6.1.2 Production of compressed air
6.1.3 Treatment of compressed air
6.2 Compressed air storage and distribution
6.3 Use of compressed air for the brake
6.4 Use of compressed air for auxiliary devices
7 Determination of the air quality classes
8 Air quality classes
8.1 Reference conditions
8.2 Characteristics of quality classes
8.3 Designation of the compressed air purity
8.4 Application to the pneumatic system of a rail vehicle
Annex A (informative) Contaminants
Annex B (informative) Demonstration of air quality during life cycle
Annex C (informative) Example for temperature range
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Units and abbreviated terms
4.1 Units
4.2 Abbreviated terms
5 Compressed air system
5.1 General
5.2 Breakdown of the system into functional units
6 Characteristics of the devices constituting the functional units
6.1 Air generation and treatment unit (AGTU)
6.1.1 Air intake
6.1.2 Production of compressed air
6.1.3 Treatment of compressed air
6.2 Compressed air storage and distribution
6.3 Use of compressed air for the brake
6.4 Use of compressed air for auxiliary devices
7 Determination of the air quality classes
8 Air quality classes
8.1 Reference conditions
8.2 Characteristics of quality classes
8.3 Designation of the compressed air purity
8.4 Application to the pneumatic system of a rail vehicle
Annex A (informative) Contaminants
Annex B (informative) Demonstration of air quality during life cycle
Annex C (informative) Example for temperature range
Bibliography