NZS ISO 11114.4:2024
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
Committee representation
Acknowledgement
Copyright
Preface
Contents
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)
5.1.1 Principle of test
5.1.2 Test conditions and procedure
5.1.3 Treatment and interpretation of test results
5.1.4 Failure in conducting test
5.1.5 Test report
5.2 Fracture mechanics test (method B)
5.2.1 Principle of the test method
5.2.2 Test procedure
5.2.3 Test results
5.3 Test method to determine the resistance to hydrogen assisted cracking of steel cylinders (method C)
5.3.1 General
5.3.2 Specimen configurations and numbers of tests
5.3.3 Fatigue precracking
5.3.4 Specimen testing procedure
5.3.5 Test procedure
5.3.6 Crack growth examination
5.3.7 Cylinder material qualification
5.3.8 Failure in conducting test
5.3.9 Test report
5.4 Tensile tests
Bibliography
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NZS ISO 11114.4 2024
Committee representation
Acknowledgement
Copyright
Preface
Contents
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)
5.1.1 Principle of test
5.1.2 Test conditions and procedure
5.1.3 Treatment and interpretation of test results
5.1.4 Failure in conducting test
5.1.5 Test report
5.2 Fracture mechanics test (method B)
5.2.1 Principle of the test method
5.2.2 Test procedure
5.2.3 Test results
5.3 Test method to determine the resistance to hydrogen assisted cracking of steel cylinders (method C)
5.3.1 General
5.3.2 Specimen configurations and numbers of tests
5.3.3 Fatigue precracking
5.3.4 Specimen testing procedure
5.3.5 Test procedure
5.3.6 Crack growth examination
5.3.7 Cylinder material qualification
5.3.8 Failure in conducting test
5.3.9 Test report
5.4 Tensile tests
Bibliography
NZS ISO 11114.4:2024
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.