Transportable gas cylinders. Compatibility of cylinder and valve materials with gas contents. Part 4: Test methods for selecting steels resistant to hydrogen embrittlement (ISO 11114-4:2017)
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ISO 11114-4: 2017 specifies test methods and the evaluation of results from these tests in order to qualify steels suitable for use in the manufacture of gas cylinders (up to 3 000 l) for hydrogen and hydrogen bearing embrittling gases. This document only applies to seamless steel gas cylinders. The requirements of this document are not applicable if at least one of the following conditions for the intended gas service is fulfilled: - the working pressure of the filled embrittling gas is less than 20 % of the test pressure of the cylinder; - the partial pressure of the filled embrittling gas of a gas mixture is less than 5 MPa (50 bar) in the case of hydrogen and other embrittling gases, with the exception of hydrogen sulphide and methyl mercaptan; in such cases, the partial pressure shall not exceed 0,25 MPa (2,5 bar). NOTE In such cases, it is possible to design the cylinder as for ordinary (non-embrittling) gases.
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Sisällysluettelo
Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
3.2 Symbols and abbreviated terms
4 General requirements
5 Test methods
5.1 Disc test (method A)
5.2 Fracture mechanics test (method B)
5.3 Test method to determine the resistance to hydrogen assisted cracking of steel cylinders (method C)
ISO 11114-1:2012 Gas cylinders -- Compatibility of cylinder and valve materials with gas contents -- Part 1: Metallic materials
ISO 11120:2015 Gas cylinders -- Refillable seamless steel tubes of water capacity between 150 l and 3000 l -- Design, construction and testing
ISO 7539-1:2012 Corrosion of metals and alloys -- Stress corrosion testing -- Part 1: General guidance on testing procedures
ISO 11114-1:2012 Gas cylinders -- Compatibility of cylinder and valve materials with gas contents -- Part 1: Metallic materials
ISO 11120:2015 Gas cylinders -- Refillable seamless steel tubes of water capacity between 150 l and 3000 l -- Design, construction and testing
ISO 7539-1:2012 Corrosion of metals and alloys -- Stress corrosion testing -- Part 1: General guidance on testing procedures
ISO 7539-6:2011 Corrosion of metals and alloys -- Stress corrosion testing -- Part 6: Preparation and use of precracked specimens for tests under constant load or constant displacement
ISO 9809-1:2010 Gas cylinders -- Refillable seamless steel gas cylinders -- Design, construction and testing -- Part 1: Quenched and tempered steel cylinders with tensile strength less than 1 100 MPa
ISO 9809-2:2010 Gas cylinders -- Refillable seamless steel gas cylinders -- Design, construction and testing -- Part 2: Quenched and tempered steel cylinders with tensile strength greater than or equal to 1 100 MPa
94/55/EC Vaarallisten aineiden tiekuljetuksia 96/49/EC Vaarallisten aineiden rautatiekuljetuksia 96/86/EC Vaarallisten aineiden tiekuljetuksia koskevan jäsenvaltioiden lainsäädännön lähentämisestä annetun neuvoston direktiivin 94/55/EY mukauttamisesta tekniikan kehitykseen neuvoston direktiivissä 96/86/EY annetun ilmoituksen mukaisesti 96/87/EC Vaarallisten aineiden rautatiekuljetuksia koskevan jäsenvaltioiden lainsäädännön lähentämisestä annetun neuvoston direktiivin 96/49/EY mukauttamisesta tekniikan kehitykseen 2008/68/EC Vaarallisten aineiden sisämaankuljetuksista