ISO 11119-3:2020
(Main)Gas cylinders — Design, construction and testing of refillable composite gas cylinders and tubes — Part 3: Fully wrapped fibre reinforced composite gas cylinders and tubes up to 450 l with non-load-sharing metallic or non-metallic liners or without liners
Gas cylinders — Design, construction and testing of refillable composite gas cylinders and tubes — Part 3: Fully wrapped fibre reinforced composite gas cylinders and tubes up to 450 l with non-load-sharing metallic or non-metallic liners or without liners
This document specifies minimum requirements for the material, design, construction and workmanship, manufacturing processes, examination and testing at time of manufacture for: — type 4 composite fully wrapped cylinders or tubes with a non-load sharing liner and composite reinforcement on both the cylindrical portion and the dome ends; — type 5 fully wrapped cylinders or tubes without liners and with a test pressure of less than 60 bar and composite reinforcement on both the cylindrical portion and the dome ends; — water capacities up to 450 l; — for the storage and conveyance of compressed or liquefied gases; — cylinders and tubes with composite reinforcement of carbon fibre, aramid fibre or glass fibre (or a mixture thereof) within a matrix; — a minimum design life of 15 years. Cylinders and tubes manufactured and tested according to this document are not intended to contain toxic, oxidizing or corrosive gases. This document does not address the design, fitting and performance of removable protective sleeves. NOTE 1 References to cylinders in this document include composite tubes if appropriate. NOTE 2 ISO 11439 applies to cylinders intended for use as fuel containers on natural gas vehicles and ISO 11623 covers periodic inspection and re-testing of composite cylinders.
Bouteilles à gaz — Conception, construction et essais des tubes et bouteilles à gaz rechargeables en matériau composite — Partie 3: Tubes et bouteilles à gaz entièrement bobinés en matériau composite renforcés de fibres d'une contenance allant jusqu'à 450 l avec liners non métalliques ou métalliques non structuraux, ou sans liners
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INTERNATIONAL ISO
STANDARD 11119-3
Third edition
2020-11
Gas cylinders — Design, construction
and testing of refillable composite gas
cylinders and tubes —
Part 3:
Fully wrapped fibre reinforced
composite gas cylinders and tubes
up to 450 l with non-load-sharing
metallic or non-metallic liners or
without liners
Bouteilles à gaz — Conception, construction et essais des tubes et
bouteilles à gaz rechargeables en matériau composite —
Partie 3: Tubes et bouteilles à gaz entièrement bobinés en matériau
composite renforcés de fibres d'une contenance allant jusqu'à 450 l avec
liners non métalliques ou métalliques non structuraux, ou sans liners
Reference number
ISO 11119-3:2020(E)
©
ISO 2020
---------------------- Page: 1 ----------------------
ISO 11119-3:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 11119-3:2020(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols . 4
5 Inspection and testing . 4
6 Materials . 4
6.1 Liner materials . 4
6.2 Composite materials . 5
7 Design and manufacture . 5
7.1 General . 5
7.2 Design submission . 6
7.3 Manufacturing . 8
8 Type approval procedure . 8
8.1 General requirements . 8
8.2 Prototype tests . 8
8.3 New design . 9
8.4 Design variants .10
8.5 Type approval test procedures and criteria .14
8.5.1 Proof pressure test .14
8.5.2 Hydraulic elastic expansion test .14
8.5.3 Cylinder burst test .15
8.5.4 Ambient cycle test .15
8.5.5 Vacuum test .17
8.5.6 Environmental cycle test.18
8.5.7 Environmentally assisted stress rupture test .19
8.5.8 Flaw test .19
8.5.9 Drop/impact test .21
8.5.10 High velocity impact (gunfire) test .24
8.5.11 Fire resistance test .25
8.5.12 Permeability test .27
8.5.13 Torque test on cylinder neck boss .28
8.5.14 Salt water immersion test .28
8.5.15 Leak test .29
8.5.16 Pneumatic cycle test .29
8.5.17 Liner burst test .30
8.5.18 Resin shear strength .31
8.5.19 Glass transition temperature .31
8.6 Failure of type approval tests .31
9 Batch inspection and testing .31
9.1 Liner .31
9.2 Failure of liner batch tests .32
9.3 Overwrap materials .32
9.4 Composite cylinder.32
9.5 Cylinder failure during type approval or batch testing .34
10 Cylinder marking .34
10.1 General .34
10.2 Additional marking .34
Annex A (informative) Examples of design approval certificate .36
© ISO 2020 – All rights reserved iii
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ISO 11119-3:2020(E)
Annex B (informative) Specimen test reports .37
Annex C (informative) Test report for equivalency .40
Annex D (informative) Standardized test requirements for thermally activated pressure
relief devices .42
Bibliography .47
iv © ISO 2020 – All rights reserved
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ISO 11119-3:2020(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 3,
Cylinder design.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
This third edition cancels and replaces the second edition (ISO 11119-3:2013), which has been
technically revised. The main changes compared to the previous edition are as follows:
— References updated.
— 7.1.4 Minimum fibre stress ratios added.
— 8.5.9 Drop/impact test. Addition of new alternative test for cylinders up to and including 50 l water
capacity with dedicated compressed gas service. Addition of alternative impact test for tubes 150 l
and above.
— 8.5.11 Fire resistance test. Changes to the procedure to make the test more consistent. Adding a
criteria for tubes above 150 l to be tested for 5 min.
— 8.5.12 Torque test is now only required for taper threads.
— References updated
— 8.5.16 Pneumatic cycle test. New procedure for the test to have a lower number of cycles but, with a
significant hold time at pressure.
A list of all parts in the ISO 11119 series can be found on the ISO website.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
ISO 11119-3:2020(E)
Introduction
The purpose of this document is to provide a specification for the design, manufacture, inspection and
testing of cylinders for world-wide usage. The objective is to balance design and economic efficiency
against international acceptance and universal utility.
This document aims to eliminate the concern about climate, duplicate inspection and restrictions
currently existing because of lack of definitive International Standards and is not to be construed as
reflecting on the suitability of the practice of any nation or region.
[1]
This document has been written so that it is suitable to be referenced in the UN Model Regulations .
This document addresses the general requirements on design, construction and initial inspection and
testing of pressure receptacles of the Recommendations on the transport of dangerous goods: Model
[2]
regulations developed by the United Nations .
vi © ISO 2020 – All rights reserved
---------------------- Page: 6 ----------------------
INTERNATIONAL STANDARD ISO 11119-3:2020(E)
Gas cylinders — Design, construction and testing of
refillable composite gas cylinders and tubes —
Part 3:
Fully wrapped fibre reinforced composite gas cylinders
and tubes up to 450 l with non-load-sharing metallic or
non-metallic liners or without liners
1 Scope
This document specifies minimum requirements for the material, design, construction and
workmanship, manufacturing processes, examination and testing at time of manufacture for:
— type 4 composite fully wrapped cylinders or tubes with a non-load sharing liner and composite
reinforcement on both the cylindrical portion and the dome ends;
— type 5 fully wrapped cylinders or tubes without liners and with a test pressure of less than 60 bar
and composite reinforcement on both the cylindrical portion and the dome ends;
— water capacities up to 450 l;
— for the storage and conveyance of compressed or liquefied gases;
— cylinders and tubes with composite reinforcement of carbon fibre, aramid fibre or glass fibre (or a
mixture thereof) within a matrix;
— a minimum design life of 15 years.
Cylinders and tubes manufactured and tested according to this document are not intended to contain
toxic, oxidizing or corrosive gases.
This document does not address the design, fitting and performance of removable protective sleeves.
NOTE 1 References to cylinders in this document include composite tubes if appropriate.
NOTE 2 ISO 11439 applies to cylinders intended for use as fuel containers on natural gas vehicles and
ISO 11623 covers periodic inspection and re-testing of composite cylinders.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 527-1, Plastics — Determination of tensile properties — Part 1: General principles
ISO 527-2, Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and
extrusion plastics
ISO 3341, Textile glass — Yarns — Determination of breaking force and breaking elongation
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method
© ISO 2020 – All rights reserved 1
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ISO 11119-3:2020(E)
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 7225, Gas cylinders — Precautionary labels
ISO 7866, Gas cylinders — Refillable seamless aluminium alloy gas cylinders — Design, construction
and testing
ISO 9809-1, Gas cylinders — Design, construction and testing of refillable seamless steel gas cylinders and
tubes — Part 1: Quenched and tempered steel cylinders and tubes with tensile strength less than 1 100 MPa
ISO 9809-2, Gas cylinders — Design, construction and testing of refillable seamless steel gas cylinders and
tubes — Part 2: Quenched and tempered steel cylinders and tubes with tensile strength greater than or
equal to 1 100 MPa
ISO 9809-3, Gas cylinders — Design, construction and testing of refillable seamless steel gas cylinders and
tubes — Part 3: Normalized steel cylinders and tubes
ISO 10618, Carbon fibre — Determination of tensile properties of resin-impregnated yarn
ISO 10286, Gas cylinders — Terminology
ISO 14130, Fibre-reinforced plastic composites — Determination of apparent interlaminar shear strength
by short-beam method
ISO 11114-1, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 1:
Metallic materials
ISO 11114-2, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 2:
Non-metallic materials
ISO 11114-4, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas
contents — Part 4: Test methods for selecting steels resistant to hydrogen embrittlement
ISO 13769, Gas cylinders — Stamp marking
ASTM D7269, Standard Test Methods for Tensile Testing of Aramid Yarns
EN 12165, Copper and copper alloys. Wrought and unwrought forging stock
ASTM E1356–08, Standard Test Method for Assignment of the Glass Transition Temperatures by Differential
Scanning Calorimetry
3 Terms and definitions
For the purposes of this document, the terms and definitions in ISO 10286 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
aramid fibre
continuous filaments of aramid laid up in tow form
3.2
batch
set of homogeneous items or material
Note 1 to entry: The number of items in a batch can vary according to the context in which the term is used.
2 © ISO 2020 – All rights reserved
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ISO 11119-3:2020(E)
3.3
batch of metallic liners
quantity of liners of the same nominal diameter, length, thickness and design, made successively from
the same batch of materials, subjected to the same manufacturing process and heat treated to the same
conditions of temperature and time
3.4
batch of non-metallic liners
quantity of liners of the same nominal diameter, length, thickness and design, made successively from
the same batch of materials and subjected to the same manufacturing process
3.5
batch of finished cylinders
production quantity of up to 200 finished cylinders successively produced by the same manufacturing
process, plus finished cylinders required for destructive testing, of the same nominal diameter, length,
thickness and design
3.6
burst pressure
highest pressure reached in a liner or cylinder during a burst test
3.7
carbon fibre
continuous filaments of carbon laid up in tow form
3.8
composite overwrap
combination of fibres and matrix
3.9
dedicated gas service
service in which a cylinder is to be used only with a specified gas or gases
3.10
equivalent fibre
fibre from the same material family and similar properties to a fibre in an approved cylinder design
3.11
equivalent liner
liner that are manufactured from the same nominal raw materials, using the same process of
manufacture and having the same physical structure and the same nominal physical properties as in an
approved cylinder design
3.12
equivalent matrix
resin matrix from the same chemical family and similar properties to the resin matrix used in a
previously prototype tested cylinder
3.14
glass fibre
continuous filaments of glass laid up in tow form
3.15
liner
inner portion of the composite cylinder, comprising a metallic or non-metallic vessel, whose purpose is
both to contain the gas and transmit the gas pressure to the fibres
3.16
matrix
material used to bind and hold the fibres in place
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ISO 11119-3:2020(E)
3.17
non-load-sharing liner
liner that has a burst pressure less than 5 % of the nominal burst pressure of the finished composite
cylinder
3.18
thermoplastic
plastics capable of being repeatedly softened by increase of temperature and hardened by decrease of
temperature
3.19
thermosetting
plastics that, when cured by the application of heat or chemical means, harden permanently into a
substantially infusible and insoluble product
3.20
nominal outside diameter
diameter of the cylinder specified by the manufacturer for the type approval including tolerances
(e.g. ±1 %)
3.21
working pressure
p
w
settled pressure of a compressed gas at a reference temperature of 15 °C in a full gas cylinder
3.22
glass transition temperature
Tg
the temperature where a polymer substrate changes from a rigid glassy material to a soft (not melted)
material, and is usually measured in terms of the stiffness, or modulus
4 Symbols
p burst pressure of liner bar
bl
p burst pressure of finished cylinder bar
b
p test pressure bar
h
p maximum developed pressure at 65 °C bar
max
5 Inspection and testing
To ensure that the cylinders conform to this document, they shall be subject to inspection and testing
in accordance with Clauses 6, 7, 8 and 9 by an inspection body (hereafter referred to as “the inspector”)
authorized to do so. Example forms of certificates that can be used are shown in Annexes A and B.
Equipment used for measurement, testing and examination during production shall be maintained and
calibrated within a documented quality management system.
6 Materials
6.1 Liner materials
6.1.1 The liner (including boss assembly) shall be manufactured from materials suitable for the gas
to be contained as specified in ISO 11114-1 and ISO 11114-2 where applicable. For compatibility with
4 © ISO 2020 – All rights reserved
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ISO 11119-3:2020(E)
hydrogen see ISO 11114-4. Materials used to manufacture the components of boss assemblies attached
to non-metallic liners shall fulfil the material performance requirements of this document.
6.1.2 The metallic liner or metallic boss component materials shall conform to the following material
performance tests in the appropriate standard:
a) seamless steel liners or bosses: the material tests in ISO 9809-1, ISO 9809-2 or ISO 9809-3;
b) seamless stainless steel liners or bosses: the material tests in ISO 9809-4;
c) seamless aluminium alloy liners or boss components: Sustained load cracking test and stress
corrosion cracking test (if size permits sample extraction) in line with ISO 7866;
d) brass boss components: material composition as defined in EN 12165.
Testing carried out on material sample coupons is acceptable for metallic boss components; where
coupons are to be used, the coupons shall be produced from a representative sample of raw material.
(i.e. if a component is manufactured from bar stock, the coupon shall be manufactured from bar stock).
6.1.3 The materials used shall be of uniform and consistent quality. The composite cylinder
manufacturer shall verify that each new batch of materials has the correct properties and is of satisfactory
quality, and maintain records from which the batch of materials used for the manufacture of each cylinder
can be identified.
6.1.4 When a neck ring is provided, it shall be of a material compatible with that of the cylinder, and
shall be securely attached by a method appropriate to the liner material.
6.2 Composite materials
6.2.1 The overwrap materials shall be carbon fibre or aramid fibre or glass fibre, or any mixture
thereof.
6.2.2 The matrix shall be a polymer suited to the application, local environmental conditions and to
the intended life of the product.
6.2.3 The suppliers of the filament material and the matrix component materials shall provide
sufficient documentation for the composite cylinder manufacturer to be able to identify fully the batch of
materials used in the manufacture of each cylinder.
6.2.4 The materials used shall be of uniform and consistent quality. The composite cylinder
manufacturer shall verify that each new batch of materials has the correct properties and is of satisfactory
quality, and maintain records from which the batch of materials used for the manufacture of each cylinder
can be identified. A certificate of conformance from the material manufacturer is considered acceptable
for the purposes of verification.
6.2.5 Batches of materials shall be identified and documented to the satisfaction of the inspector.
7 Design and manufacture
7.1 General
7.1.1 A type 4 fully-wrapped composite gas cylinder with non-load-sharing metallic or non-metallic
liner shall comprise:
a) an internal metal or non-metallic liner which carries no significant load;
© ISO 2020 – All rights reserved 5
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ISO 11119-3:2020(E)
b) metallic boss(es) for thread connections, where these are part of the design;
c) a composite overwrap formed by layers of continuous fibres in a matrix; and
d) an optional external protection system.
Where necessary, care shall be taken to ensure that there is no adverse reaction between the liner and
the reinforcing fibre by the application of a suitable protective coating to the liner prior to the wrapping
process.
7.1.2 A type 5 fully-wrapped cylinder without liner with a test pressure of less than 60 bar shall
comprise:
a) metallic boss(es) for thread connections, where these are part of the design;
b) a composite overwrap formed by layers of continuous fibres in a matrix and
c) an optional external protection system.
Type 5 cylinders and tubes made from two or more parts joined together are not permitted under this
document.
7.1.3 Cylinders shall be designed with one or two openings along the central axis only. Threads shall
extend completely through the neck or have sufficient threads to allow full engagement of the valve.
7.1.4 The cylinders shall be designed for high reliability under sustained load and cyclic loading.
Therefore, it is necessary to take account of the properties of the individual composite fibres and to
establish their respective minimum fibre stress ratios.
The fibre stress ratio is defined as the fibre stress at design minimum burst pressure divided by the
fibre stress at 2/3 test pressure.
Th
...
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 11119-3
ISO/TC 58/SC 3
Design, construction and testing of
Secretariat: BSI
refillable composite gas cylinders
Voting begins on:
2020-08-26 and tubes —
Voting terminates on:
Part 3:
2020-10-21
Fully wrapped fibre reinforced
composite gas cylinders and tubes
up to 450 l with non-load-sharing
metallic or non-metallic liners or
without liners
Construction, conception et essais des bouteilles à gaz rechargeables
en matériau composite et tubes —
Partie 3: Bouteilles à gaz composites entièrement bobinées renforcées
par des fibres et tubes d'une contenance allant jusqu'à 450 l avec
liners métalliques ou non métalliques ne transmettant pas la charge
ou sans liners
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 11119-3:2020(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2020
---------------------- Page: 1 ----------------------
ISO/FDIS 11119-3:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 11119-3:2020(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols . 4
5 Inspection and testing . 4
6 Materials . 4
6.1 Liner materials . 4
6.2 Composite materials . 5
7 Design and manufacture . 5
7.1 General . 5
7.2 Design submission . 6
7.3 Manufacturing . 8
8 Type approval procedure . 8
8.1 General requirements . 8
8.2 Prototype tests . 8
8.3 New design . 9
8.4 Design variants .10
8.5 Type approval test procedures and criteria .14
8.5.1 Proof pressure test .14
8.5.2 Hydraulic elastic expansion test .14
8.5.3 Cylinder burst test .15
8.5.4 Ambient cycle test .15
8.5.5 Vacuum test .17
8.5.6 Environmental cycle test.18
8.5.7 Environmentally assisted stress rupture test .19
8.5.8 Flaw test .19
8.5.9 Drop/impact test .21
8.5.10 High velocity impact (gunfire) test .24
8.5.11 Fire resistance test .25
8.5.12 Permeability test .27
8.5.13 Torque test on cylinder neck boss .28
8.5.14 Salt water immersion test .28
8.5.15 Leak test .29
8.5.16 Pneumatic cycle test .29
8.5.17 Liner burst test .30
8.5.18 Resin shear strength .31
8.5.19 Glass transition temperature .31
8.6 Failure of type approval tests .31
9 Batch inspection and testing .31
9.1 Liner .31
9.2 Failure of liner batch tests .32
9.3 Overwrap materials .32
9.4 Composite cylinder.32
9.5 Cylinder failure during type approval or batch testing .34
10 Cylinder marking .34
10.1 General .34
10.2 Additional marking .34
Annex A (informative) Examples of design approval certificate .36
© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 11119-3:2020(E)
Annex B (informative) Specimen test reports .37
Annex C (informative) Test report for equivalency .40
Annex D (informative) Standardized test requirements for thermally activated pressure
relief devices .43
Bibliography .48
iv © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/FDIS 11119-3:2020(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 3,
Cylinder design.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
This third edition cancels and replaces the second edition (ISO 11119-3:2013), which has been
technically revised. The main changes compared to the previous edition are as follows:
— References updated.
— 7.1.4 Minimum fibre stress ratios added.
— 8.5.9 Drop/impact test. Addition of new optional test for cylinders up to and including 50 l water
capacity with dedicated compressed gas service. Addition of optional impact test for tubes 150 l
and above.
— 8.5.11 Fire resistance test. Changes to the procedure to make the test more consistent. Adding a
criteria for tubes above 150 l to be tested for 5 min.
— 8.5.12 Torque test is now only required for taper threads.
— References updated
— 8.5.16 Pneumatic cycle test. New procedure for the test to have a lower number of cycles but, with a
significant hold time at pressure.
A list of all parts in the ISO 11119 series can be found on the ISO website.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
ISO/FDIS 11119-3:2020(E)
Introduction
The purpose of this document is to provide a specification for the design, manufacture, inspection and
testing of cylinders for world-wide usage. The objective is to balance design and economic efficiency
against international acceptance and universal utility.
This document aims to eliminate the concern about climate, duplicate inspection and restrictions
currently existing because of lack of definitive International Standards and is not to be construed as
reflecting on the suitability of the practice of any nation or region.
[1]
This document has been written so that it is suitable to be referenced in the UN Model Regulations .
This document addresses the general requirements on design, construction and initial inspection and
testing of pressure receptacles of the Recommendations on the transport of dangerous goods: Model
[2]
regulations developed by the United Nations .
vi © ISO 2020 – All rights reserved
---------------------- Page: 6 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 11119-3:2020(E)
Design, construction and testing of refillable composite gas
cylinders and tubes —
Part 3:
Fully wrapped fibre reinforced composite gas cylinders
and tubes up to 450 l with non-load-sharing metallic or
non-metallic liners or without liners
1 Scope
This document specifies minimum requirements for the material, design, construction and
workmanship, manufacturing processes, examination and testing at time of manufacture for:
— type 4 composite fully wrapped cylinders or tubes with a non-load sharing liner and composite
reinforcement on both the cylindrical portion and the dome ends;
— type 5 fully wrapped cylinders or tubes without liners and with a test pressure of less than 60 bar
and composite reinforcement on both the cylindrical portion and the dome ends;
— water capacities up to 450 l;
— for the storage and conveyance of compressed or liquefied gases;
— cylinders and tubes with composite reinforcement of carbon fibre, aramid fibre or glass fibre (or a
mixture thereof) within a matrix;
— a minimum design life of 15 years.
Cylinders and tubes manufactured and tested according to this document are not intended to contain
toxic, oxidizing or corrosive gases.
This document does not address the design, fitting and performance of removable protective sleeves.
NOTE 1 References to cylinders in this document include composite tubes if appropriate.
NOTE 2 ISO 11439 applies to cylinders intended for use as fuel containers on natural gas vehicles and
ISO 11623 covers periodic inspection and re-testing of composite cylinders.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 527-1, Plastics — Determination of tensile properties — Part 1: General principles
ISO 527-2, Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and
extrusion plastics
ISO 3341, Textile glass — Yarns — Determination of breaking force and breaking elongation
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method
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ISO/FDIS 11119-3:2020(E)
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 7225, Gas cylinders — Precautionary labels
ISO 7866, Gas cylinders — Refillable seamless aluminium alloy gas cylinders — Design, construction
and testing
ISO 9809-1, Gas cylinders — Design, construction and testing of refillable seamless steel gas cylinders and
tubes — Part 1: Quenched and tempered steel cylinders and tubes with tensile strength less than 1 100 MPa
ISO 9809-2, Gas cylinders — Design, construction and testing of refillable seamless steel gas cylinders and
tubes — Part 2: Quenched and tempered steel cylinders and tubes with tensile strength greater than or
equal to 1 100 MPa
ISO 9809-3, Gas cylinders — Design, construction and testing of refillable seamless steel gas cylinders and
tubes — Part 3: Normalized steel cylinders and tubes
ISO 10618, Carbon fibre — Determination of tensile properties of resin-impregnated yarn
ISO 10286, Gas cylinders — Terminology
ISO 14130, Fibre-reinforced plastic composites — Determination of apparent interlaminar shear strength
by short-beam method
ISO 11114-1, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 1:
Metallic materials
ISO 11114-2, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 2:
Non-metallic materials
ISO 11114-4, Transportable gas cylinders — Compatibility of cylinder and valve materials with gas
contents — Part 4: Test methods for selecting steels resistant to hydrogen embrittlement
ISO 13769, Gas cylinders — Stamp marking
ASTM D7269, Standard Test Methods for Tensile Testing of Aramid Yarns
EN 12165, Copper and copper alloys. Wrought and unwrought forging stock
ASTM E1356–08, Standard Test Method for Assignment of the Glass Transition Temperatures by Differential
Scanning Calorimetry
3 Terms and definitions
For the purposes of this document, the terms and definitions in ISO 10286 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
aramid fibre
continuous filaments of aramid laid up in tow form
3.2
batch
set of homogeneous items or material
Note 1 to entry: The number of items in a batch can vary according to the context in which the term is used.
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ISO/FDIS 11119-3:2020(E)
3.3
batch of metallic liners
quantity of liners of the same nominal diameter, length, thickness and design, made successively from
the same batch of materials, subjected to the same manufacturing process and heat treated to the same
conditions of temperature and time
3.4
batch of non-metallic liners
quantity of liners of the same nominal diameter, length, thickness and design, made successively from
the same batch of materials and subjected to the same manufacturing process
3.5
batch of finished cylinders
production quantity of up to 200 finished cylinders successively produced by the same manufacturing
process, plus finished cylinders required for destructive testing, of the same nominal diameter, length,
thickness and design
3.6
burst pressure
highest pressure reached in a liner or cylinder during a burst test
3.7
carbon fibre
continuous filaments of carbon laid up in tow form
3.8
composite overwrap
combination of fibres and matrix
3.9
dedicated gas service
service in which a cylinder is to be used only with a specified gas or gases
3.10
equivalent fibre
fibre from the same material family and similar properties to a fibre in an approved cylinder design
3.11
equivalent liner
liner that are manufactured from the same nominal raw materials, using the same process of
manufacture and having the same physical structure and the same nominal physical properties as in an
approved cylinder design
3.12
equivalent matrix
resin matrix from the same chemical family and similar properties to the resin matrix used in a
previously prototype tested cylinder
3.14
glass fibre
continuous filaments of glass laid up in tow form
3.15
liner
inner portion of the composite cylinder, comprising a metallic or non-metallic vessel, whose purpose is
both to contain the gas and transmit the gas pressure to the fibres
3.16
matrix
material used to bind and hold the fibres in place
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ISO/FDIS 11119-3:2020(E)
3.17
non-load-sharing liner
liner that has a burst pressure less than 5 % of the nominal burst pressure of the finished composite
cylinder
3.18
thermoplastic
plastics capable of being repeatedly softened by increase of temperature and hardened by decrease of
temperature
3.19
thermosetting
plastics that, when cured by the application of heat or chemical means, harden permanently into a
substantially infusible and insoluble product
3.20
nominal outside diameter
diameter of the cylinder specified by the manufacturer for the type approval including tolerances
(e.g. ±1 %)
3.21
working pressure
p
w
settled pressure of a compressed gas at a reference temperature of 15 °C in a full gas cylinder
3.22
glass transition temperature
Tg
the temperature where a polymer substrate changes from a rigid glassy material to a soft (not melted)
material, and is usually measured in terms of the stiffness, or modulus
4 Symbols
p burst pressure of liner bar
bl
p burst pressure of finished cylinder bar
b
p test pressure bar
h
p maximum developed pressure at 65 °C bar
max
5 Inspection and testing
To ensure that the cylinders conform to this document, they shall be subject to inspection and testing
in accordance with Clauses 6, 7, 8 and 9 by an inspection body (hereafter referred to as “the inspector”)
authorized to do so. Example forms of certificates that can be used are shown in Annexes A and B.
Equipment used for measurement, testing and examination during production shall be maintained and
calibrated within a documented quality management system.
6 Materials
6.1 Liner materials
6.1.1 The liner (including boss assembly) shall be manufactured from materials suitable for the gas
to be contained as specified in ISO 11114-1 and ISO 11114-2 where applicable. For compatibility with
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ISO/FDIS 11119-3:2020(E)
hydrogen see ISO 11114-4. Materials used to manufacture the components of boss assemblies attached
to non-metallic liners shall fulfil the material performance requirements of this document.
6.1.2 The metallic liner or metallic boss component materials shall conform to the following material
performance tests in the appropriate standard:
a) seamless steel liners or bosses: the material tests in ISO 9809-1, ISO 9809-2 or ISO 9809-3;
b) seamless stainless steel liners or bosses: the material tests in ISO 9809-4;
c) seamless aluminium alloy liners or boss components: Sustained load cracking test and stress
corrosion cracking test (if size permits sample extraction) in line with ISO 7866;
d) brass boss components: material composition as defined in EN 12165.
Testing carried out on material sample coupons is acceptable for metallic boss components; where
coupons are to be used, the coupons shall be produced from a representative sample of raw material.
(i.e. if a component is manufactured from bar stock, the coupon shall be manufactured from bar stock).
6.1.3 The materials used shall be of uniform and consistent quality. The composite cylinder
manufacturer shall verify that each new batch of materials has the correct properties and is of satisfactory
quality, and maintain records from which the batch of materials used for the manufacture of each cylinder
can be identified.
6.1.4 When a neck ring is provided, it shall be of a material compatible with that of the cylinder, and
shall be securely attached by a method appropriate to the liner material.
6.2 Composite materials
6.2.1 The overwrap materials shall be carbon fibre or aramid fibre or glass fibre, or any mixture
thereof.
6.2.2 The matrix shall be a polymer suited to the application, local environmental conditions and to
the intended life of the product.
6.2.3 The suppliers of the filament material and the matrix component materials shall provide
sufficient documentation for the composite cylinder manufacturer to be able to identify fully the batch of
materials used in the manufacture of each cylinder.
6.2.4 The materials used shall be of uniform and consistent quality. The composite cylinder
manufacturer shall verify that each new batch of materials has the correct properties and is of satisfactory
quality, and maintain records from which the batch of materials used for the manufacture of each cylinder
can be identified. A certificate of conformance from the material manufacturer is considered acceptable
for the purposes of verification.
6.2.5 Batches of materials shall be identified and documented to the satisfaction of the inspector.
7 Design and manufacture
7.1 General
7.1.1 A type 4 fully-wrapped composite gas cylinder with non-load-sharing metallic or non-metallic
liner shall comprise:
a) an internal metal or non-metallic liner which carries no significant load;
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ISO/FDIS 11119-3:2020(E)
b) metallic boss(es) for thread connections, where these are part of the design;
c) a composite overwrap formed by layers of continuous fibres in a matrix; and
d) an optional external protection system.
Where necessary, care shall be taken to ensure that there is no adverse reaction between the liner and
the reinforcing fibre by the application of a suitable protective coating to the liner prior to the wrapping
process.
7.1.2 A type 5 fully-wrapped cylinder without liner with a test pressure of less than 60 bar shall
comprise:
a) metallic boss(es) for thread connections, where these are part of the design;
b) a composite overwrap formed by layers of continuous fibres in a matrix and
c) an optional external protection system.
Type 5 cylinders and tubes made from two or more parts joined together are not permitted under this
document.
7.1.3 Cyl
...
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