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NZS ISO 11114.4:2024

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Transportable gas cylinders – Compatibility of cylinder and valve materials with gas contents Part 4: Test methods for selecting steels resistant to hydrogen embrittlement

Standard specifies the 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 3000 litres) for hydrogen and hydrogen-bearing embrittling gases. This document applies to seamless steel gas cylinders only.
The requirements of this document are not applicable if at least one of the following conditions for the intended gas service is fulfilled:
(a) The working pressure of the filled embrittling gas is less than 20% of the test pressure of the cylinder;
(b) 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, except for 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.
The standard was prepared by the P3652 Hydrogen Standards Committee and is identical to and has been reproduced from ISO 11114-4:2017, Transportable gas cylinders – Compatibility of cylinder and valve materials with gas contents – Part 4: Test methods for selecting steels resistant to hydrogen embrittlement.

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NZS ISO 11114.4:2024

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