Foreword

Introduction

1Scope

2Normative references

3Terms and definitions

4Materials

4.1General

4.2Cylinder materials

4.3Valve materials

4.3.1General

4.3.2Particular considerations

5Compatibility criteria

5.1General

5.2Corrosion

5.2.1General

5.2.2Corrosion in dry conditions

5.2.3Corrosion in wet conditions

5.2.4Corrosion by impurities

5.3Hydrogen embrittlement phenomenon

5.4Generation of dangerous products

5.5Violent reactions (e.g. ignition)

5.6Stress corrosion cracking

6Material compatibility

6.1Table of compatibility for single gases

6.2Compatibility for gas mixtures

6.3Using Table 1

6.3.1Conventions and numbers

6.3.2Abbreviations for materials

Annex AGas/materials NQSAB compatibility code (informative)

A.1General

A.2Material classes and compatibility identification

A.2.1Normalized steels and carbon steels (N)

A.2.2Quenched and tempered steels (Q)

A.2.3Stainless steels (S)

A.2.4Aluminium alloys (A)

A.2.5Brass and other copper alloys (B)

A.3NQSAB code

A.4Groups of gases

Bibliography