Transportable gas cylinders - Fully wrapped carbon composite cylinders and tubes for hydrogen

This document specifies minimum requirements for the materials, design, construction, prototype testing and routine manufacturing inspections of composite gas cylinders and tubes for compressed hydrogen.
NOTE 1   Unless specified in the text, for the purposes of this document, the word "cylinder" includes tubes.
This document applies only to fully wrapped composite cylinders with carbon fibres intended to be permanently mounted in a frame (e.g. bundle or trailer) with a test pressure of not less than 300 bar, with:
-   non-metallic liners or seamless metallic liners;
-   a maximum water capacity of 3 000 l;
-   a maximum working pressure of 1 000 bar;
-   the product of working pressure times water capacity (p × V) not exceeding 1 000 000 bar.l.
NOTE 2   A glass fibre protective layer is sometimes applied to the external surface of the cylinder.

Ortsbewegliche Gasflaschen - Vollumwickelte Flaschen und Großflaschen aus Kohlenstoff-Verbundwerkstoffen für Wasserstoff

Dieses Dokument legt Mindestanforderungen an die Werkstoffe, Auslegung und Herstellung, Baumuster-prüfung und routinemäßigen Inspektionen während der Herstellung von Composite-Gasflaschen und -Großflaschen für verdichteten Wasserstoff fest.
ANMERKUNG 1   Sofern im Text nicht anders festgelegt, schließt der Begriff "Flasche" für die Anwendung dieses Dokuments Großflaschen ein.
Dieses Dokument gilt nur für vollumwickelte Composite-Flaschen mit Kohlenstofffasern, die dafür vorgesehen sind, dauerhaft in einen Rahmen (z. B. Bündel oder Anhänger) mit einem Prüfdruck von nicht weniger als 300 bar eingebaut zu werden, mit:
-   nichtmetallischen Linern oder nahtlosen metallischen Linern;
-   einem maximalen Fassungsraum von 3 000 l;
-   einem maximalen Betriebsdruck von 1 000 bar;
-   einem Produkt aus Betriebsdruck und Fassungsraum (p × V), das 1 000 000 bar ∙ l nicht überschreitet.
ANMERKUNG 2   Eine Glasfaser-Schutzschicht wird mitunter auf die Außenfläche der Flasche aufgebracht.

Bouteilles à gaz transportables - Bouteilles et tubes entièrement bobinées en matériaux composites carbones pour l'hydrogène

Le présent document spécifie les exigences minimales relatives aux matériaux, à la conception, à la construction, aux essais de prototype et aux contrôles courants de production des bouteilles à gaz et tubes en matériaux composites pour l’hydrogène comprimé.
NOTE 1   Sauf mention contraire dans le texte, le terme « bouteille » inclut les tubes pour les besoins du présent document.
Le présent document s’applique uniquement aux bouteilles en matériaux composites entièrement bobinées avec des fibres de carbone, destinées à être montées de manière permanente dans un châssis (par exemple, un cadre ou une remorque) avec une pression d’épreuve d’au moins 300 bar et :
-   des liners non métalliques ou des liners métalliques sans soudure ;
-   une contenance maximale en eau de 3 000 l ;
-   une pression de service maximale de 1 000 bar ;
-   le produit de la pression de service multipliée par la contenance en eau (p × V) ne dépassant pas 1 000 000 bar·l.
NOTE 2   Une couche de protection en fibre de verre est parfois appliquée sur la surface de la bouteille.

Premične plinske jeklenke - Popolnoma obvite jeklenke in velike jeklenke za vodik iz kompozitnih materialov z ogljikovimi vlakni

General Information

Status
Published
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
24-Jun-2020
Completion Date
24-Jun-2020

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SLOVENSKI STANDARD
SIST EN 17339:2020
01-september-2020

Premične plinske jeklenke - Popolnoma obvite jeklenke in velike jeklenke za vodik

iz kompozitnih materialov z ogljikovimi vlakni

Transportable gas cylinders - Fully wrapped carbon composite cylinders and tubes for

hydrogen
Ortsbewegliche Gasflaschen - Vollumwickelte Flaschen und Großflaschen aus
Kohlenstoff-Verbundwerkstoffen für Wasserstoff

Bouteilles à gaz transportables - Bouteilles et tubes entièrement bobinées en matériaux

composites carbones pour l'hydrogène
Ta slovenski standard je istoveten z: EN 17339:2020
ICS:
23.020.35 Plinske jeklenke Gas cylinders
SIST EN 17339:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 17339:2020
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SIST EN 17339:2020
EN 17339
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2020
EUROPÄISCHE NORM
ICS 23.020.35
English Version
Transportable gas cylinders - Fully wrapped carbon
composite cylinders and tubes for hydrogen

Bouteilles à gaz transportables - Bouteilles et tubes Ortsbewegliche Gasflaschen - Vollumwickelte Flaschen

entièrement bobinées en matériaux composites und Großflaschen aus Kohlenstoff-Verbundwerkstoffen

carbones pour l'hydrogène für Wasserstoff
This European Standard was approved by CEN on 10 May 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17339:2020 E

worldwide for CEN national Members.
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SIST EN 17339:2020
EN 17339:2020 (E)
Contents Page

European foreword ............................................................................................................................... 4

Introduction ............................................................................................................................................ 5

1 Scope ............................................................................................................................................ 6

2 Normative references ............................................................................................................ 6

3 Terms and definitions ........................................................................................................... 8

4 Symbols .................................................................................................................................... 10

5 Design and manufacture .................................................................................................... 10

5.1 General requirements ........................................................................................................ 10

5.2 Liner .......................................................................................................................................... 11

5.3 Composite overwrap ........................................................................................................... 12

5.4 Finished cylinder .................................................................................................................. 13

6 Cylinder and material tests .............................................................................................. 14

6.1 General ..................................................................................................................................... 14

6.2 Requirements and test methods ..................................................................................... 14

6.3 Failure to meet test requirements ................................................................................. 27

7 Conformity evaluation ........................................................................................................ 27

8 Marking .................................................................................................................................... 28

Annex A (normative) Prototype, design variant and production testing ..................... 29

A.1 General ..................................................................................................................................... 29

A.2 Prototype testing .................................................................................................................. 29

A.2.1 General ..................................................................................................................................... 29

A.2.2 Definition of new design .................................................................................................... 29

A.2.3 Prototype testing requirements ..................................................................................... 30

A.2.4 Prototype testing certificate ............................................................................................ 31

A.3 Design variant testing ......................................................................................................... 34

A.3.1 General ..................................................................................................................................... 34

A.3.2 Definition of a design variant .......................................................................................... 34

A.3.2.1 Conditions to be satisfied .................................................................................................. 34

A.3.2.2 Equivalent fibre .................................................................................................................... 34

A.3.2.3 Equivalent matrix ................................................................................................................. 34

A.3.2.4 Equivalent liner .................................................................................................................... 35

A.3.2.5 Cylinder variant .................................................................................................................... 35

A.3.3 Design variant test requirements .................................................................................. 36

A.3.4 Design variant testing certificate ................................................................................... 36

A.4 Production testing ............................................................................................................... 40

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SIST EN 17339:2020
EN 17339:2020 (E)

A.4.1 General ..................................................................................................................................... 40

A.4.2 Production test requirements ......................................................................................... 40

A.4.3 Liner batch tests and inspections ................................................................................... 40

A.4.3.1 Metallic liner .......................................................................................................................... 40

A.4.3.2 Non-metallic liner ................................................................................................................ 41

A.4.4 Composite materials batch tests and inspections .................................................... 41

A.4.5 Tests and inspections of the finished cylinder .......................................................... 41

A.4.5.1 Tests .......................................................................................................................................... 41

A.4.5.2 Inspections ............................................................................................................................. 42

A.4.6 Batch acceptance certificate ............................................................................................. 42

Annex B (informative) Examples of prototype approval and production testing

certificates .............................................................................................................................. 43

B.1 Type approval certificate – composite cylinders with metallic liners .............. 43

B.2 Type approval certificate – composite cylinders with non-metallic liners ..... 44

B.3 Design variant approval certificate – composite cylinders with metallic

liners ......................................................................................................................................... 45

B.4 Production test certificate ................................................................................................ 46

Annex C (informative) Example of High velocity impact (bullet) test ............................ 48

C.1 Procedure ................................................................................................................................ 48

C.2 Criteria ..................................................................................................................................... 48

C.3 Parameters to monitor and record ................................................................................ 48

Bibliography ......................................................................................................................................... 49

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SIST EN 17339:2020
EN 17339:2020 (E)
European foreword
This document (EN 17339:2020) has been prepared by Technical Committee CEN/TC 23
“Transportable gas cylinders”, the secretariat of which is held by BSI.

This European Standard shall be given the status of a national standard, either by publication of

an identical text or by endorsement, at the latest by December 2020, and conflicting national

standards shall be withdrawn at the latest by December 2020.

Attention is drawn to the possibility that some of the elements of this document may be the

subject of patent rights. CEN shall not be held responsible for identifying any or all such patent

rights.

This document has been prepared under a mandate given to CEN by the European Commission

and the European Free Trade Association.
This document has been submitted for reference in:
— the RID; and
— the technical annexes of the ADR.

NOTE These regulations take precedence over any clause of this document. It is emphasised that

RID/ADR are being revised regularly at intervals of two years which may lead to temporary non-

compliances with the clauses of this document.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,

Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,

Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,

Switzerland, Turkey and the United Kingdom.
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SIST EN 17339:2020
EN 17339:2020 (E)
Introduction

The purpose of this document is to provide a specification for the design, manufacture, inspection

and testing of refillable, transportable carbon fully wrapped composite cylinders and tubes filled

with hydrogen and protected in a frame such as a bundle or a trailer.

The specifications given are based on knowledge of, and experience with, materials, design

requirements, manufacturing processes and control during manufacture of cylinders and tubes

in common use in the countries of the CEN members.

For gas cylinders covered by RID/ADR, the maximum service pressure (maximum developed

pressure at 65 °C) should not exceed the test pressure. Consequently the safety factor applies to

the test pressure since, whatever the gas, the maximum developed pressure (p ) is, in any case,

max
lower than or equal to the test pressure.

This document only covers compressed hydrogen (dedicated service), therefore, the safety factor

is applied to the maximum developed pressure at 65 °C (p ), which is the maximum accepted

max
temperature by transport regulations.
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SIST EN 17339:2020
EN 17339:2020 (E)
1 Scope

This document specifies minimum requirements for the materials, design, construction,

prototype testing and routine manufacturing inspections of composite gas cylinders and tubes

for compressed hydrogen.

NOTE 1 Unless specified in the text, for the purposes of this document, the word “cylinder” includes

tubes.

This document applies only to fully wrapped composite cylinders with carbon fibres intended to

be permanently mounted in a frame (e.g. bundle or trailer) with a test pressure of not less than

300 bar, with:
— non-metallic liners or seamless metallic liners;
— a maximum water capacity of 3 000 l;
— a maximum working pressure of 1 000 bar;

— the product of working pressure times water capacity (p × V) not exceeding 1 000 000 bar.l.

NOTE 2 A glass fibre protective layer is sometimes applied to the external surface of the cylinder.

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.

EN 13807, Transportable gas cylinders - Battery vehicles and multiple-element gas containers

(MEGCs) - Design, manufacture, identification and testing

EN ISO 75-1, Plastics - Determination of temperature of deflection under load - Part 1: General test

method (ISO 75-1)

EN ISO 75-3, Plastics - Determination of temperature of deflection under load - Part 3: High-

strength thermosetting laminates (ISO 75-3)

EN ISO 527-1, Plastics - Determination of tensile properties - Part 1: General principles (ISO 527-1)

EN ISO 527-2, Plastics - Determination of tensile properties - Part 2: Test conditions for moulding

and extrusion plastics (ISO 527-2)

EN ISO 1133-1, Plastics - Determination of the melt mass-flow rate (MFR) and melt volume-flow

rate (MVR) of thermoplastics - Part 1: Standard method (ISO 1133-1)

EN ISO 1183 (all parts), Plastics - Methods for determining the density of non-cellular plastics

EN ISO 1628-3, Plastics - Determination of the viscosity of polymers in dilute solution using capillary

viscometers - Part 3: Polyethylenes and polypropylenes (ISO 1628-3)

EN ISO 2884-1, Paints and varnishes - Determination of viscosity using rotary viscometers - Part 1:

Cone-and-plate viscometer operated at a high rate of shear (ISO 2884-1)
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SIST EN 17339:2020
EN 17339:2020 (E)

EN ISO 3146, Plastics - Determination of melting behaviour (melting temperature or melting range)

of semi-crystalline polymers by capillary tube and polarizing-microscope methods (ISO 3146)

EN ISO 7866, Gas cylinders - Refillable seamless aluminium alloy gas cylinders - Design, construction

and testing (ISO 7866)

EN 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 9809-1)

EN 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 9809-2)

ISO 9809-4, Gas cylinders - Refillable seamless steel gas cylinders - Design, construction and testing

- Part 4: Stainless steel cylinders with an Rm value of less than 1 100 MPa

EN ISO 10961, Gas cylinders - Cylinder bundles - Design, manufacture, testing and inspection (ISO

10961)

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

Part 1: Metallic materials (ISO 11114-1)

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

Part 2: Non-metallic materials (ISO 11114-2)

EN 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

11114-4)

EN ISO 11120, Gas cylinders - Refillable seamless steel tubes of water capacity between 150 l and

3000 l - Design, construction and testing (ISO 11120)
EN ISO 13341, Gas cylinders - Fitting of valves to gas cylinders (ISO 13341)
EN ISO 13769, Gas cylinders - Stamp marking (ISO 13769)

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

strength by short-beam method (ISO 14130)

ISO 6721-11, Plastics - Determination of dynamic mechanical properties - Part 11: Glass transition

temperature

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

ASTM D 2196-10, Test methods for rheological properties of non-newtonian materials by rotational

(Brookfield) viscometer

ASTM D 2344/D 2344M-13, Test Method for Short-Beam Strength of Polymer Matrix Composite

Materials and Their Laminates

ASTM D 4018-11, Test methods for properties of continuous filament carbon and graphite fibre

tows
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SIST EN 17339:2020
EN 17339:2020 (E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp/ui
3.1
ambient temperature

temperature of surroundings varying between 0 °C and 35 °C (for test purposes only)

3.2
autofrettage

pressure application procedure which strains the metal liner past its yield strength sufficient to

cause permanent plastic deformation, and results in the liner having compressive stresses and

the fibres having tensile stresses when at zero internal gauge pressure
[SOURCE: EN ISO 10286:2015, definition 557]
3.3
batch (of fibres, pre-impregnated fibres or components of the matrix system)

homogeneous quantity of material, identified and certified as such by the supplier

3.4
batch (of metallic liners)

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

from the same material cast and subjected to the same heat treatment for the same length of time

3.5
batch (of non-metallic liners)

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

from the same batch of materials and subjected to the same manufacturing process
3.6
batch (of finished cylinders with liners)

quantity of up to 200 finished cylinders, plus cylinders for destructive testing, of the same

nominal diameter, thickness, length and design which may contain different batches of liners

(providing the batches are nominally the same and have had the same treatments), fibres and

matrix materials
3.7
burst pressure
highest pressure reached in a cylinder or liner during a burst test

[SOURCE: EN ISO 10286:2015, definition 732, modified — “or liner” has been added.]

3.8
composite overwrap
combination of fibres and matrix
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EN 17339:2020 (E)
3.9
elastomer

material which at ambient temperature can be stretched repeatedly to at least twice its original

length and will return with force to approximately its original length immediately upon release

of the stress
3.10
exterior coating

layer of clear or pigmented material applied to the cylinder as protection or for cosmetic purposes

3.11
guaranteed minimum burst pressure

guaranteed minimum burst pressure shall not be less than 2 times the maximum developed

pressure at 65 °C and no less than 85 % of the value obtained during type approval.

3.12
liner

inner portion of a composite cylinder, whose purpose is both to contain the gas and transmit the

gas pressure to the composite overwrap

Note 1 to entry: It can be metallic or non-metallic, load sharing or non-load sharing

[SOURCE: EN ISO 10286:2015, definition 246 modified — Note 1 to entry has been added.]

3.13
matrix
material that is used to bind and hold the fibres in place
[SOURCE: EN ISO 10286:2015, definition 245]
3.14
non-load sharing liner

liner that contributes less than 5% of the load bearing of the overall cylinder design at nominal

burst pressure of the finished composite cylinder

Note 1 to entry: In this document, a non-load sharing liner is assumed to be a non-metallic one.

3.15
non-metallic liner
liner made from thermoplastic, thermosetting or elastomer material

Note 1 to entry: In this document, a non-metallic liner is assumed to be a non-load sharing one.

3.16
thermoplastic

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

decrease of temperature
3.17
thermoset

plastics which, when cured by the application of heat or chemical means, change into a

substantially infusible and insoluble product
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SIST EN 17339:2020
EN 17339:2020 (E)
3.18
test pressure
required pressure applied during a pressure test
[SOURCE: EN ISO 10286:2015, definition 729]
3.19
working pressure

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

cylinder
[SOURCE: EN ISO 10286:2015, definition 736]
4 Symbols
p actual burst pressure of composite cylinder, in bar above atmospheric pressure
(1 bar = 10 Pa = 0,1 MPa.)
p burst pressure of liner, in bar above atmospheric pressure
(1 bar = 10 Pa = 0,1 MPa.)

p minimum burst pressure of composite cylinder obtained during design variant approval

bmin
testing, in bar above atmospheric pressure

p hydraulic test pressure of composite cylinder, in bar above atmospheric pressure, p is

h h
equal to 1,5 × p
(1 bar = 10 Pa = 0,1 MPa.)

p maximum developed pressure at 65 °C, in bar above atmospheric pressure. It is assumed

max
in this document to be equal to 1,18 × p
(1 bar = 10 Pa = 0,1 MPa.)
p working pressure
5 Design and manufacture
5.1 General requirements

A fully wrapped composite gas cylinder may be manufactured with a metallic or non-metallic

liner. An optional exterior coating or fibre layers may be used to provide external protection and

when this is an integral part of the design, it shall be permanent.
The cylinder may also include additional parts (e.g. neck rings and foot rings).

Cylinders shall be designed with one or two openings along the central axis only.

The cylinders covered by this document shall be permanently mounted in a bundle according to

EN ISO 10961 or a trailer/MEGCs according to EN 13807.
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EN 17339:2020 (E)
5.2 Liner
5.2.1 Metallic liners

Metallic liners shall be manufactured in accordance with the relevant sections of:

Type of metallic liner Related Standard
a) seamless steel liners: EN ISO 9809-1, EN ISO 9809-2 or EN
ISO 11120, as appropriate;
b) seamless stainless steel liners: ISO 9809-4;
c) seamless aluminium alloy liners: EN ISO 7866

The relevant sections are those covering materials, thermal treatments, neck design, construction

and workmanship and mechanical tests.

The liner material shall be compatible with hydrogen as determined by EN ISO 11114-1 and

EN ISO 11114-4.

NOTE This excludes the design requirements, since these are specified by the manufacturer for the

design of the composite cylinder. For liners with water capacity above 150 l manufactured of stainless steel

or aluminium alloy, the relevant sections of the appropriate standard also apply.

5.2.2 Non-metallic liners

A cylinder with a non-metallic liner shall be designed as if the liner will be non-load sharing. The

liner material shall be compatible with hydrogen as determined by EN ISO 11114-2 or

demonstrated by suitable testing.

Where a metal end boss is used in a non-metallic liner, it shall be considered part of the liner

material and shall fulfil the material requirements specified in the relevant standard, as listed in

5.2.1. Other materials are acceptable if hydrogen compatibility is demonstrated by testing

according to EN ISO 11114-4 or if it is accepted by design standards (e.g. EN ISO 7866).

The drawing of the liner shall include the specification of the material and material properties of

the boss. The following material properties of the boss shall be specified in the design:

a) minimum yield stress;
b) minimum tensile strength;
c) minimum elongation;
d) compatibility with hydrogen as determined by EN ISO 11114-1.

The metal end boss bearing the cylinder thread shall be designed to withstand the torque applied

in fitting the valve to the cylinder and the tests specified in Test 13 (for taper threads only, see

6.2.13) and Test 14 (see 6.2.14).
5.2.3 Design drawing

A fully dimensioned drawing of the liner shall be supplied which includes the specification of the

material and material properties. Material and liner properties to be specified on the drawing are:

a) for metallic liners:
— minimum yield stress;
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SIST EN 17339:2020
EN 17339:2020 (E)
— minimum tensile strength;
— minimum elongation;
— minimum burst pressure;
— compatibility with hydrogen as determined by EN ISO 11114-1.
b) for non-metallic liners:
1) density;
— melting point, as determined by:
— EN ISO 3146 for thermoplastics; or
— EN ISO 75-1 and EN ISO 75-3 for thermoset materials;

— glass transition temperature as determined by differential scanning calorimetry;

— composition;
— compatibility with hydrogen as specified by EN ISO 11114-2 or demonstrated by
suitable testing
— end boss design in accordance with 5.2.2.
5.2.4 Design of ends

The external diameter and thickness of the formed neck end of the liner shall be designed to

withstand the torque applied in fitting the valve to the cylinder and the tests specified in Test 13

(for taper threads only, see 6.2.13) and Test 14 (see 6.2.14).
5.2.5 Neck ring

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

shall be securely attached by an appropriate method to the liner (or cylinder for cylinders without

liner) or boss material.
5.3 Composite overwrap
5.3.1 Materials

Material requirements for the fibre and matrix or the pre-impregnated material shall be as

specified by the cylinder manufacturer.
5.3.2 Winding

Appropriate procedures shall be defined for the winding and curing process to ensure good

repeatability and traceability.
Parameters to be specified and monitored are:
a) composite overwrap component percentages;
b) batch numbers of the material used as defined in 3.3 to 3.6;
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EN 17339:2020 (E)
c) number of strands used;
d) winding tension per strand (if applicable);
e) winding speed(s);
f) winding angle and/or pitch for each layer;
g) resin bath temperature range (if applicable);
h) temperature of the strand before consolidation (if applicable);
i) number and order of layers;

j) procedure used to obtain correct impregnation (e.g. wet winding or pre-impregnation);

k) polymerisation cycle (if applicable);

l) polymerisation process (e.g. thermal cycling, ultrasonic, ultraviolet or radiation).

For thermal polymerisation, the temperature and the length of the polymerisation cycle of the

resin system shall be such that they do not adversely affect the mechanical characteristics of the

liner. In addition, tolerances for holding time and temperature at each stage shall be defined.

5.4 Finished cylinder
5.4.1 Design drawings

A fully dimensioned drawing of all parts that constitute the finished cylinder shall be supplied.

The design drawing shall include tolerances on all dimensions, including out-of-roundness and

straightness.

The drawing shall include the specification of the material(s), the material properties and the

reinforcement pattern. The specifications and the reinforcement patterns may be given in a

technical specification enclosed with th
...

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