ISO 11114-1:2012
Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 1: Metallic materials
ISO 11114-1:2012 provides requirements for the selection of safe combinations of metallic cylinder and valve materials and cylinder gas content.
The compatibility data given is related to single gases and to gas mixtures.
Seamless metallic, welded metallic and composite gas cylinders and their valves, used to contain compressed, liquefied and dissolved gases, are considered.
Aspects such as the quality of delivered gas product are not considered.
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1 Scope
2 Normative references
3 Terms and definitions
4 Materials
4.1 General
4.2 Cylinder materials
4.3 Valve materials
4.3.1 General
The most commonly used metallic materials for valve bodies and internal gas wetted parts are brass and other similar copper-based alloys, carbon steel, stainless steel, nickel and nickel alloys, Cu–Be (2 %) and aluminium alloys.
4.3.2 Particular considerations
4.3.2.1 In special cases, noncompatible materials may be used for non-oxidizing gases if suitably plated, protected or coated. This may only be done if all compatibility aspects have been considered and validated by a competent person for the entire life of the valve.
4.3.2.2 Special precautions, in accordance with ISO 11114-3 (which addresses testing, not precautions per se), shall be taken for oxidizing gases as specified in ISO 10156. In this case, noncompatible materials are not acceptable (see 3.3) for use in valves, even if plated, protected or coated.
4.3.2.3 For cylinder valves, compatibility in wet conditions shall be considered because of the high risk of contamination by atmospheric moisture and an airborne contaminant.
5 Compatibility criteria
5.1 General
5.2 Corrosion
5.2.1 Corrosion in dry conditions
5.2.2 Corrosion in wet conditions
5.2.3 Corrosion by impurities
5.3 Hydrogen embrittlement phenomenon
5.4 Generation of dangerous products
5.5 Violent reactions (e.g. ignition)
5.6 Stress corrosion cracking
6 Material compatibility
6.1 Table of compatibility for single gases (see Table 1)
6.2 Compatibility for gas mixtures
6.3 Using Table 1
6.3.1 Conventions and numbers
6.3.2 Abbreviations for materials
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1 Scope
2 Normative references
3 Terms and definitions
4 Materials
4.1 General
4.2 Cylinder materials
4.3 Valve materials
4.3.1 General
The most commonly used metallic materials for valve bodies and internal gas wetted parts are brass and other similar copper-based alloys, carbon steel, stainless steel, nickel and nickel alloys, Cu–Be (2 %) and aluminium alloys.
4.3.2 Particular considerations
4.3.2.1 In special cases, noncompatible materials may be used for non-oxidizing gases if suitably plated, protected or coated. This may only be done if all compatibility aspects have been considered and validated by a competent person for the entire life of the valve.
4.3.2.2 Special precautions, in accordance with ISO 11114-3 (which addresses testing, not precautions per se), shall be taken for oxidizing gases as specified in ISO 10156. In this case, noncompatible materials are not acceptable (see 3.3) for use in valves, even if plated, protected or coated.
4.3.2.3 For cylinder valves, compatibility in wet conditions shall be considered because of the high risk of contamination by atmospheric moisture and an airborne contaminant.
5 Compatibility criteria
5.1 General
5.2 Corrosion
5.2.1 Corrosion in dry conditions
5.2.2 Corrosion in wet conditions
5.2.3 Corrosion by impurities
5.3 Hydrogen embrittlement phenomenon
5.4 Generation of dangerous products
5.5 Violent reactions (e.g. ignition)
5.6 Stress corrosion cracking
6 Material compatibility
6.1 Table of compatibility for single gases (see Table 1)
6.2 Compatibility for gas mixtures
6.3 Using Table 1
6.3.1 Conventions and numbers
6.3.2 Abbreviations for materials