AS/NZS ISO 11120:2025
Gas cylinders – Refillable seamless steel tubes of water capacity between 150 l and 3000 l – Design, construction and testing
Standard specifies minimum requirements for the material, design, construction and workmanship, manufacturing processes, examinations and tests at manufacture of refillable quenched and tempered seamless steel tubes of water capacities exceeding 150 l up to and including 3 000 l for compressed and liquefied gases exposed to extreme world-wide ambient temperatures, normally between –50°C and +65°C.
This document is applicable to tubes with a maximum tensile strength, Rma, of less than 1 100 MPa. These tubes can be used alone or in batteries to equip trailers or multiple element gas containers (ISO modules or skids) for the transportation and distribution of compressed gases.
This document is applicable to tubes having an opening at each end.
This document is identical with, and has been reproduced from, ISO 11120:2015 Gas cylinders – Refillable seamless steel tubes of water capacity between 150 l and 3 000 l – Design, construction and testing.
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AS/NZS ISO 11120:2025 Gas cylinders - Refillable seamless steel tubes of water capacity between 150 l and 3000 l - Design, construction and testing
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Inspection and testing
6 Materials
6.1 General requirements
6.2 Controls on chemical composition
6.3 Heat treatment
6.4 Mechanical properties
6.5 Failure to meet test requirements
7 Design
7.1 Calculation of cylindrical shell thickness
7.2 Design of tube ends
7.3 Design drawing
8 Construction and workmanship
8.1 General
8.2 Surface imperfections
8.3 Ultrasonic examination
8.4 End closure (fitting)
8.5 Dimensional tolerances
8.5.1 Out-of-roundness
8.5.2 Outside diameter
8.5.3 Straightness
8.5.4 Eccentricity
8.5.5 Length
8.5.6 Water capacity
8.5.7 Mass
9 Type approval procedure
9.1 General requirements
9.2 Prototype tests
9.3 Type approval test report
9.4 Type approval certificate
10 Batch tests
10.1 General requirements
10.2 Mechanical tests
10.2.1 General requirements
10.2.2 Tensile test
10.2.3 Impact testing
10.3 Interpretation of results
11 Tests on every tube
11.1 General
11.2 Hydraulic test
11.2.1 Proof pressure test
11.2.2 Volumetric expansion test
11.3 Hardness testing
11.4 Visual inspection
11.5 Dimensional inspection
11.5.1 Thickness
11.5.2 Diameter and length
11.5.3 Water capacity and mass
11.5.4 Neck threads and openings
11.6 Ultrasonic non-destructive test
12 Special requirements for tubes for embrittling gases
12.1 General
12.2 Materials
12.3 Design
12.4 Construction and workmanship
12.4.1 General
12.4.2 Surface imperfections
12.5 Mechanical tests
12.5.1 Tensile and impact tests
12.5.2 Hardness test
13 Inspection certificate
14 Marking
Annex A (informative) Typical chemistry groupings for seamless steel tubes
Annex B (normative) Ultrasonic examination
Annex C (informative) Description and evaluation of manufacturing imperfections and conditions for rejection of seamless steel tubes at time of final inspection by the manufacturer
Annex D (informative) Acceptance certificate
Annex E (informative) Type approval certificate
Annex F (informative) Bend stress calculation
Bibliography
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AS/NZS ISO 11120:2025 Gas cylinders - Refillable seamless steel tubes of water capacity between 150 l and 3000 l - Design, construction and testing
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Inspection and testing
6 Materials
6.1 General requirements
6.2 Controls on chemical composition
6.3 Heat treatment
6.4 Mechanical properties
6.5 Failure to meet test requirements
7 Design
7.1 Calculation of cylindrical shell thickness
7.2 Design of tube ends
7.3 Design drawing
8 Construction and workmanship
8.1 General
8.2 Surface imperfections
8.3 Ultrasonic examination
8.4 End closure (fitting)
8.5 Dimensional tolerances
8.5.1 Out-of-roundness
8.5.2 Outside diameter
8.5.3 Straightness
8.5.4 Eccentricity
8.5.5 Length
8.5.6 Water capacity
8.5.7 Mass
9 Type approval procedure
9.1 General requirements
9.2 Prototype tests
9.3 Type approval test report
9.4 Type approval certificate
10 Batch tests
10.1 General requirements
10.2 Mechanical tests
10.2.1 General requirements
10.2.2 Tensile test
10.2.3 Impact testing
10.3 Interpretation of results
11 Tests on every tube
11.1 General
11.2 Hydraulic test
11.2.1 Proof pressure test
11.2.2 Volumetric expansion test
11.3 Hardness testing
11.4 Visual inspection
11.5 Dimensional inspection
11.5.1 Thickness
11.5.2 Diameter and length
11.5.3 Water capacity and mass
11.5.4 Neck threads and openings
11.6 Ultrasonic non-destructive test
12 Special requirements for tubes for embrittling gases
12.1 General
12.2 Materials
12.3 Design
12.4 Construction and workmanship
12.4.1 General
12.4.2 Surface imperfections
12.5 Mechanical tests
12.5.1 Tensile and impact tests
12.5.2 Hardness test
13 Inspection certificate
14 Marking
Annex A (informative) Typical chemistry groupings for seamless steel tubes
Annex B (normative) Ultrasonic examination
Annex C (informative) Description and evaluation of manufacturing imperfections and conditions for rejection of seamless steel tubes at time of final inspection by the manufacturer
Annex D (informative) Acceptance certificate
Annex E (informative) Type approval certificate
Annex F (informative) Bend stress calculation
Bibliography
AS/NZS ISO 11120:2025
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.