ISO/FDIS 11119-3

DRAFT INTERNATIONAL STANDARD
ISO/DIS 11119-3
ISO/TC 58/SC 3 Secretariat: BSI
Voting begins on: Voting terminates on:
2019-08-21 2019-11-13
Gas cylinders — Refillable composite gas cylinders and
tubes — Design, construction and testing —
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 — Bouteilles à gaz rechargeables en matériau composite et tubes — Conception,

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

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

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Symbols and units ............................................................................................................................................................................................... 4

5 Inspection and testing .................................................................................................................................................................................... 4

6 Materials ....................................................................................................................................................................................................................... 5

6.1 Liner materials ........................................................................................................................................................................................ 5

6.2 Composite materials .......................................................................................................................................................................... 5

7 Design and manufacture .............................................................................................................................................................................. 6

7.1 General ........................................................................................................................................................................................................... 6

7.2 Design submission ............................................................................................................................................................................... 7

7.3 Manufacturing ......................................................................................................................................................................................... 8

8 Type approval procedure ............................................................................................................................................................................ 8

8.1 General requirements ....................................................................................................................................................................... 8

8.2 Prototype tests ........................................................................................................................................................................................ 8

8.3 New design ..............................................................................................................................................................................................10

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 test ...............................................................................................................................................................................21

8.5.10 High velocity impact (gunfire) test ...............................................................................................................23

8.5.11 Fire resistance test ......................................................................................................................................................23

8.5.12 Permeability test ...........................................................................................................................................................25

8.5.13 Torque test on cylinder neck boss .................................................................................................................26

8.5.14 Salt water immersion test .....................................................................................................................................26

8.5.15 Leak test ...............................................................................................................................................................................27

8.5.16 Pneumatic cycle test ..................................................................................................................................................27

8.5.17 Liner burst test ...............................................................................................................................................................28

8.5.18 Resin shear strength ..................................................................................................................................................29

8.6 Failure of type approval tests ..................................................................................................................................................29

9 Batch inspection and testing .................................................................................................................................................................29

9.1 Liner ..............................................................................................................................................................................................................29

9.2 Failure of liner batch tests ..........................................................................................................................................................30

9.3 Overwrap materials .........................................................................................................................................................................30

9.4 Composite cylinder...........................................................................................................................................................................31

9.5 Cylinder failure during type approval or batch testing .....................................................................................32

10 Cylinder marking ..............................................................................................................................................................................................32

10.1 General ........................................................................................................................................................................................................32

10.2 Additional marking ..........................................................................................................................................................................33

Annex A (informative) Examples of design approval certificate ..........................................................................................34

Annex B (informative) Specimen test reports ..........................................................................................................................................35

Annex C (informative) Test report for equivalency ............................................................................................................................38

Annex D (informative) Standardised test requirements for thermally activated pressure

relief devices ..........................................................................................................................................................................................................41

Bibliography .............................................................................................................................................................................................................................46

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

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International

Standards adopted by the technical committees are circulated to the member bodies for voting.

Publication as an International Standard requires approval by at least 75 % of the member bodies

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.

ISO 11119-3 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 3,

This standard has been written so that it is suitable to be referenced in the UN Model Regulations .

ISO 11119 consists of the following parts, under the general title Gas cylinders — Refillable composite

— Part 1: Hoop wrapped fibre reinforced composite gas cylinders and tubes up to 450 l

— Part 2: Fully wrapped fibre reinforced composite gas cylinders and tubes up to 450 l with load-sharing

— Part 3: Fully wrapped fibre reinforced composite gas cylinders and tubes up to 450L with non-load-

— Part 4: Fully wrapped fibre reinforced composite gas cylinders with load-sharing welded metal liners

Note [1] United Nations. Recommendations on the Transport of Dangerous Goods – Model Regulations.

The purpose of ISO 11119 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

ISO 11119 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

This part of ISO 11119 addresses the general requirements on design, construction and initial

inspection and testing of pressure receptacles of the United Nations “Recommendations on the Transport

This part of ISO 11119 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

— 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 (Type 5 linerless

cylinders and tubes made from two or more parts joined together are not permitted under this

— cylinders and tubes with composite reinforcement of carbon fibre, aramid fibre or glass fibre (or a

Cylinders and tubes manufactured and tested to this standard are not intended to contain toxic,

NOTE 1 References to cylinders in this International Standard include composite tubes if appropriate.

NOTE 2 ISO 11439 applies to cylinders intended for use as fuel containers on natural gas vehicles and

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. 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

ISO 3341, Textile glass — Yarns — Determination of breaking force and breaking elongation

ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature

ISO 10618, Carbon fibre — Determination of tensile properties of resin-impregnated yarn

ISO 14130, Fibre-reinforced plastic composites — Determination of apparent interlaminar shear strength

ISO 11114-1, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 1:

ISO 11114-2, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 2:

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:

Note 1 to entry: The number of items in a batch can vary according to the context in which the term is used.

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

quantity of liners of the same nominal diameter, length, thickness and design, made successively from

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,

fibre from the same material family and similar properties to a fibre in an approved cylinder design

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

resin matrix from the same chemical family and similar properties to the resin matrix used in a

layers of material applied to the cylinder as protection or for cosmetic purposes

inner portion of the composite cylinder, comprising a metallic or non-metallic vessel, whose purpose is

liner that has a burst pressure less than 5 % of the nominal burst pressure of the finished composite

plastics capable of being repeatedly softened by increase of temperature and hardened by decrease of

plastics that, when cured by the application of heat or chemical means, harden permanently into a

diameter of the cylinder specified by the manufacturer for the type approval including tolerances (e.g.

fully wrapped cylinder with a non-load sharing liner and composite reinforcement on both the

fully wrapped cylinder without a liner and with composite reinforcement on both the cylindrical

settled pressure of a compressed gas at a reference temperature of 15 °C in a full gas cylinder

ISO 11119-3 is intended to be used under a variety of national regulatory regimes but has been written

so that it is suitable for use with the conformity assessment system of the UN Model Regulations for the

Transportation of Dangerous Goods. Attention is drawn to requirements in specified relevant national

regulations of the country (countries) where the cylinders are intended to be used that might override

To ensure that the cylinders conform to this part of ISO 11119, 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

Equipment used for measurement, testing and examination during production shall be maintained and

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. Materials used to

manufacture the components of boss assemblies attached to non-metallic liners shall fulfil the material

6.1.2 The metallic liner or metallic boss component materials shall conform to the following material

a) seamless steel liners or bosses: the material tests in ISO 9809-1, ISO 9809-2 or ISO 9809-3;

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.

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

6.1.4 When a neck ring is provided, it shall be of a material compatible with that of the cylinder, and

6.2.1 The overwrap materials shall be carbon fibre or aramid fibre or glass fibre, or any mixture

6.2.2 The matrix shall be a polymer suited to the application, local environmental conditions and to

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

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

6.2.5 Batches of materials shall be identified and documented to the satisfaction of the inspector.

7.1.1 A Type 4 fully-wrapped composite gas cylinder with non-load-sharing metallic or non-metallic

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

7.1.2 A Type 5 fully-wrapped cylinder without liner with a test pressure of less than 60 bar shall

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

The fibre stress ratio is defined as the fibre stress at design minimum burst pressure divided by the

The fibre stress ratio for Type 4 and Type 5 cylinders can be confirmed by burst testing. The strength

of the individual types of fibres used in hybrid construction may be verified by testing of containers

reinforced with a single type of fibre. In a hybrid construction, the applicable stress ratio requirements