AS/NZS ISO 11439:2025
Gas cylinders – High pressure cylinders for the on-board storage of natural gas as a fuel for automotive vehicles
Standard specifies minimum requirements for light-weight refillable gas cylinders intended only for the on-board storage of high-pressure compressed natural gas as a fuel for automotive vehicles to which the cylinders are to be fixed. The service conditions do not cover external loadings that can arise from vehicle collisions, etc.
This document covers cylinders of any seamless steel, seamless aluminum alloy or non-metallic material construction, using any design or method of manufacture suitable for the specified service conditions. It does not cover cylinders of stainless steel.
This document uses 200 bar as a reference working pressure, but other working pressures can be used.
Cylinders covered by this document are designated Type 1, Type 2, Type 3 and Type 4.
This document is identical with, and has been reproduced from, ISO 11439:2013 Gas cylinders – High pressure cylinders for the on-board storage of natural gas as a fuel for automotive vehicles and its Amendment No. 1 (2021).
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AS/NZS ISO 11439:2025 Gas cylinders - High pressure cylinders for the on-board storage of natural gas as a fuel for automotive vehicles
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Service conditions
4.1 General
4.1.1 Standard service conditions
4.1.2 Service life
4.2 Maximum pressures
4.3 Design number of filling cycles
4.4 Temperature range
4.4.1 Settled gas temperature
4.4.2 Cylinder temperatures
4.4.3 Transient temperatures
4.5 Gas composition
4.5.1 General
4.5.2 Dry gas
4.5.3 Wet gas
4.6 External surfaces
5 Inspection and testing
6 Type approval procedure
6.1 General
6.2 Type approval
6.3 Statement of service
6.4 Design data
6.4.1 Drawings
6.4.2 Stress analysis report
6.4.3 Material property data
6.4.4 Fire protection
6.5 Manufacturing data
6.6 Fracture performance and non-destructive examination (NDE) defect size
6.7 Specification sheet
6.8 Additional supporting data
6.9 Type approval certificate
7 Requirements for type 1 metal cylinders
7.1 General
7.2 Materials
7.2.1 General requirements
7.2.2 Controls on chemical composition
7.3 Design Requirements
7.3.1 Test pressure
7.3.2 Burst pressure
7.3.3 Stress analysis
7.3.4 Maximum defect size
7.3.5 Openings
7.3.6 Fire protection
7.3.7 Attachments
7.4 Construction and workmanship
7.4.1 End closure
7.4.2 Heat treatment
7.4.3 Neck threads
7.4.4 Exterior environmental protection
7.4.5 Traceability
7.5 Prototype testing procedure
7.5.1 General requirements
7.5.2 Prototype tests
7.5.3 Change of design
7.6 Batch tests
7.6.1 General requirements
7.6.2 Required tests
7.7 Tests on every cylinder
7.8 Batch acceptance certificate
7.9 Failure to meet test requirements
8 Requirements for type 2 hoop-wrapped cylinders
8.1 General
8.2 Materials
8.2.1 General requirements
8.2.2 Controls on chemical composition
8.2.3 Composite materials
8.3 Design requirements
8.3.1 Test pressure
8.3.2 Burst pressures and fibre stress ratios
8.3.3 Stress analysis
8.3.4 Maximum defect size
8.3.5 Openings
8.3.6 Fire protection
8.4 Construction and workmanship
8.4.1 General
8.4.2 Liner
8.4.3 Neck threads
8.4.4 Overwrap
8.4.5 Exterior environmental protection
8.4.6 Traceability
8.5 Prototype testing procedure
8.5.1 General requirements
8.5.2 Prototype tests
8.5.3 Change of design
8.6 Batch tests on liners and cylinders
8.6.1 General requirements
8.6.2 Required tests
8.7 Tests on every liner and cylinder
8.8 Batch acceptance certificate
8.9 Failure to meet test requirements
8.9.1 Liners
8.9.2 Cylinders
9 Requirements for type 3 fully-wrapped cylinders
9.1 General
9.2 Materials
9.2.1 General requirements
9.2.2 Controls on chemical composition
9.2.3 Composite materials
9.3 Design requirements
9.3.1 Test pressure
9.3.2 Burst pressures and fibre stress ratios
9.3.3 Stress analysis
9.3.4 Maximum defect size
9.3.5 Openings
9.3.6 Fire protection
9.4 Construction and workmanship
9.4.1 General
9.4.2 Liner
9.4.3 Neck threads
9.4.4 Overwrap
9.4.5 Exterior environmental protection
9.4.6 Traceability
9.5 Prototype testing procedure
9.5.1 General requirements
9.5.2 Prototype tests
9.5.3 Change of design
9.6 Batch tests on liners and cylinders
9.6.1 General requirements
9.6.2 Liner tests
9.6.3 Cylinder tests
9.6.4 Cylinder failures
9.7 Tests on every liner and cylinder
9.7.1 General
9.7.2 Liner tests
9.7.3 Cylinder tests
9.8 Batch acceptance certificate
9.9 Failure to meet test requirements
9.9.1 Liners
9.9.2 Cylinders
10 Requirements for type 4 fully-wrapped composite cylinders
10.1 General
10.2 Materials
10.2.1 General requirements
10.2.2 Resins
10.2.3 Fibres
10.2.4 Plastic liners
10.2.5 Metal bosses
10.3 Design requirements
10.3.1 Test pressure
10.3.2 Burst pressures and fibre stress ratios
10.3.3 Stress analysis
10.3.4 Openings
10.3.5 Fire protection
10.4 Construction and workmanship
10.4.1 General
10.4.2 Neck threads
10.4.3 Curing of thermosetting resins
10.4.4 Exterior environmental protection
10.4.5 Traceability
10.5 Prototype testing procedure
10.5.1 General
10.5.2 Prototype tests
10.5.3 Change of design
10.6 Batch tests
10.6.1 General requirements
10.6.2 Required tests
10.7 Tests on every cylinder
10.8 Batch acceptance certificate
10.9 Failure to meet test requirements
11 Marking
12 Preparation for dispatch
Annex A (normative) Test methods and criteria
Annex B (normative) Ultrasonic examination
Annex C (informative) Non-destructive examination (NDE) defect size by flawed cylinder cycling
Annex D (informative) Report forms
Annex E (informative) Standard working pressures
Annex F (informative) Verification of stress ratios using strain gauges
Annex G (informative) Manufacturer’s instructions for handling, use and inspection of cylinders
AMENDMENT 1
Annex H (informative) Corrosion resistance
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AS/NZS ISO 11439:2025 Gas cylinders - High pressure cylinders for the on-board storage of natural gas as a fuel for automotive vehicles
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Service conditions
4.1 General
4.1.1 Standard service conditions
4.1.2 Service life
4.2 Maximum pressures
4.3 Design number of filling cycles
4.4 Temperature range
4.4.1 Settled gas temperature
4.4.2 Cylinder temperatures
4.4.3 Transient temperatures
4.5 Gas composition
4.5.1 General
4.5.2 Dry gas
4.5.3 Wet gas
4.6 External surfaces
5 Inspection and testing
6 Type approval procedure
6.1 General
6.2 Type approval
6.3 Statement of service
6.4 Design data
6.4.1 Drawings
6.4.2 Stress analysis report
6.4.3 Material property data
6.4.4 Fire protection
6.5 Manufacturing data
6.6 Fracture performance and non-destructive examination (NDE) defect size
6.7 Specification sheet
6.8 Additional supporting data
6.9 Type approval certificate
7 Requirements for type 1 metal cylinders
7.1 General
7.2 Materials
7.2.1 General requirements
7.2.2 Controls on chemical composition
7.3 Design Requirements
7.3.1 Test pressure
7.3.2 Burst pressure
7.3.3 Stress analysis
7.3.4 Maximum defect size
7.3.5 Openings
7.3.6 Fire protection
7.3.7 Attachments
7.4 Construction and workmanship
7.4.1 End closure
7.4.2 Heat treatment
7.4.3 Neck threads
7.4.4 Exterior environmental protection
7.4.5 Traceability
7.5 Prototype testing procedure
7.5.1 General requirements
7.5.2 Prototype tests
7.5.3 Change of design
7.6 Batch tests
7.6.1 General requirements
7.6.2 Required tests
7.7 Tests on every cylinder
7.8 Batch acceptance certificate
7.9 Failure to meet test requirements
8 Requirements for type 2 hoop-wrapped cylinders
8.1 General
8.2 Materials
8.2.1 General requirements
8.2.2 Controls on chemical composition
8.2.3 Composite materials
8.3 Design requirements
8.3.1 Test pressure
8.3.2 Burst pressures and fibre stress ratios
8.3.3 Stress analysis
8.3.4 Maximum defect size
8.3.5 Openings
8.3.6 Fire protection
8.4 Construction and workmanship
8.4.1 General
8.4.2 Liner
8.4.3 Neck threads
8.4.4 Overwrap
8.4.5 Exterior environmental protection
8.4.6 Traceability
8.5 Prototype testing procedure
8.5.1 General requirements
8.5.2 Prototype tests
8.5.3 Change of design
8.6 Batch tests on liners and cylinders
8.6.1 General requirements
8.6.2 Required tests
8.7 Tests on every liner and cylinder
8.8 Batch acceptance certificate
8.9 Failure to meet test requirements
8.9.1 Liners
8.9.2 Cylinders
9 Requirements for type 3 fully-wrapped cylinders
9.1 General
9.2 Materials
9.2.1 General requirements
9.2.2 Controls on chemical composition
9.2.3 Composite materials
9.3 Design requirements
9.3.1 Test pressure
9.3.2 Burst pressures and fibre stress ratios
9.3.3 Stress analysis
9.3.4 Maximum defect size
9.3.5 Openings
9.3.6 Fire protection
9.4 Construction and workmanship
9.4.1 General
9.4.2 Liner
9.4.3 Neck threads
9.4.4 Overwrap
9.4.5 Exterior environmental protection
9.4.6 Traceability
9.5 Prototype testing procedure
9.5.1 General requirements
9.5.2 Prototype tests
9.5.3 Change of design
9.6 Batch tests on liners and cylinders
9.6.1 General requirements
9.6.2 Liner tests
9.6.3 Cylinder tests
9.6.4 Cylinder failures
9.7 Tests on every liner and cylinder
9.7.1 General
9.7.2 Liner tests
9.7.3 Cylinder tests
9.8 Batch acceptance certificate
9.9 Failure to meet test requirements
9.9.1 Liners
9.9.2 Cylinders
10 Requirements for type 4 fully-wrapped composite cylinders
10.1 General
10.2 Materials
10.2.1 General requirements
10.2.2 Resins
10.2.3 Fibres
10.2.4 Plastic liners
10.2.5 Metal bosses
10.3 Design requirements
10.3.1 Test pressure
10.3.2 Burst pressures and fibre stress ratios
10.3.3 Stress analysis
10.3.4 Openings
10.3.5 Fire protection
10.4 Construction and workmanship
10.4.1 General
10.4.2 Neck threads
10.4.3 Curing of thermosetting resins
10.4.4 Exterior environmental protection
10.4.5 Traceability
10.5 Prototype testing procedure
10.5.1 General
10.5.2 Prototype tests
10.5.3 Change of design
10.6 Batch tests
10.6.1 General requirements
10.6.2 Required tests
10.7 Tests on every cylinder
10.8 Batch acceptance certificate
10.9 Failure to meet test requirements
11 Marking
12 Preparation for dispatch
Annex A (normative) Test methods and criteria
Annex B (normative) Ultrasonic examination
Annex C (informative) Non-destructive examination (NDE) defect size by flawed cylinder cycling
Annex D (informative) Report forms
Annex E (informative) Standard working pressures
Annex F (informative) Verification of stress ratios using strain gauges
Annex G (informative) Manufacturer’s instructions for handling, use and inspection of cylinders
AMENDMENT 1
Annex H (informative) Corrosion resistance
AS/NZS ISO 11439:2025
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.