SIST EN ISO 24431:2017
(Main)Gas cylinders - Seamless, welded and composite cylinders for compressed and liquefied gases (excluding acetylene) - Inspection at time of filling (ISO 24431:2016)
Gas cylinders - Seamless, welded and composite cylinders for compressed and liquefied gases (excluding acetylene) - Inspection at time of filling (ISO 24431:2016)
This International Standard specifies the inspection requirements at the time of filling, and applies
to seamless or welded transportable gas cylinders made of steel or aluminium-alloy (Type 1), and for
composite transportable gas cylinders (Types 2 to 5 inclusive) for liquefied or compressed gases of a
water capacity up to 150 l. It may be applicable to cylinders and tubes with a water capacity between
150 l and 450 l, provided they are inspected and filled as individual cylinders and tubes.
This International Standard does not apply to acetylene cylinders, bundles of cylinders, tubes, multipleelement
gas container (MEGCs) or battery vehicles.
This International Standard may also be applicable to LPG. For specific LPG applications, refer to
ISO 10691.
For cylinders manifolded in bundles, refer to ISO 11755.
Gasflaschen - Nahtlose, geschweißte und Composite-Flaschen für verdichtete und verflüssigte Gase (ausgenommen Acetylen) - Inspektion zum Zeitpunkt des Füllens (ISO 24431:2016)
Diese Internationale Norm legt die Inspektionsanforderungen zum Zeitpunkt des Füllens fest und gilt für nahtlose oder geschweißte ortsbewegliche Gasflaschen aus Stahl oder einer Aluminiumlegierung (Typ 1) und für ortsbewegliche Gasflaschen aus Verbundwerkstoff (Composite) (Typen 2 bis einschließlich 5) für verflüssigte oder verdichtete Gase mit einer Wasserkapazität bis zu 150 l. Sie darf auf Gasflaschen und Großflaschen mit einer Wasserkapazität zwischen 150 l und 450 l angewendet werden, wenn sie als einzelne Gasflaschen und Großflaschen untersucht und befüllt werden.
Diese Internationale Norm gilt nicht für Acetylenflaschen, für Flaschenbündel oder Großflaschen, Gascontainer mit mehreren Elementen (MEGC, en: multiple-element gas container) oder Batteriefahrzeuge.
Diese Internationale Norm ist auch auf Flüssiggas (LPG, en: Liquefied Petroleum Gas) anwendbar. Für besondere Flüssiggasanwendungen, siehe ISO 10691.
Für Flaschenbündel, siehe ISO 11755.
Bouteilles à gaz - Bouteilles à gaz comprimés et liquéfiés (à l'exception de l'acétylène) - Contrôle au moment du remplissage (ISO 24431:2016)
ISO 24431:2016 spécifie les exigences de contrôle au moment du remplissage, et s'applique aux bouteilles à gaz transportables, soudées ou sans soudure, en acier ou en alliage d'aluminium (type 1), et aux bouteilles composites transportables (types 2 à 5 inclus) à gaz comprimés ou liquéfiés d'une contenance en eau maximale de 150 l. Elle est applicable aux bouteilles et tubes dont la contenance en eau est comprise entre 150 l et 450 l, à condition qu'ils soient contrôlés et remplis individuellement.
ISO 24431:2016 ne s'applique pas aux bouteilles d'acétylène, aux cadres de bouteilles, aux tubes, aux conteneurs à gaz à éléments multiples (CGEM) ou aux véhicules-batteries.
ISO 24431:2016 est également applicable au GPL. Pour les applications GPL, se reporter à l'ISO 10691.
Pour les cadres de bouteilles reliées par tuyau collecteur, se reporter à l'ISO 11755.
Plinske jeklenke - Jeklenke iz celega, varjene jeklenke in jeklenke iz kompozitnih materialov za stisnjene in utekočinjene pline (razen acetilena) - Kontrola v času polnjenja (ISO 24431:2016)
Ta mednarodni standard določa zahteve za kontrolo v času polnjenja in se uporablja za premične plinske jeklenke iz celega materiala ali premične varjene plinske jeklenke iz jekla ali aluminijeve zlitine (tip 1) ter za premične plinske jeklenke iz kompozitnih materialov (tip 2 do vključno 5) za utekočinjene ali stisnjene pline s prostornine vode do 150 l. Uporablja se lahko za jeklenke in cevi s prostornino vode med 150 in 450 l, če so pregledane in se polnijo individualno.
Ta mednarodni standard se ne uporablja za acetilenske jeklenke, sklope jeklenk, cevi, plinske vsebnike iz več elementov (MEGC) ali baterijska vozila.
Ta mednarodni standard se lahko uporablja tudi za utekočinjeni naftni plin. Za posebne uporabe za utekočinjeni naftni plin glej standard ISO 10691.
Za sklope jeklenk glej standard ISO 11755.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 24431:2017
01-maj-2017
3OLQVNHMHNOHQNH-HNOHQNHL]FHOHJDYDUMHQHMHNOHQNHLQMHNOHQNHL]NRPSR]LWQLK
PDWHULDORY]DVWLVQMHQHLQXWHNRþLQMHQHSOLQH UD]HQDFHWLOHQD .RQWURODYþDVX
SROQMHQMD ,62
Gas cylinders - Seamless, welded and composite cylinders for compressed and liquefied
gases (excluding acetylene) - Inspection at time of filling (ISO 24431:2016)
Gasflaschen - Nahtlose, geschweißte und Composite-Flaschen für verdichtete und
verflüssigte Gase (ausgenommen Acetylen) - Inspektion zum Zeitpunkt des Füllens (ISO
24431:2016)
Bouteilles à gaz - Bouteilles à gaz comprimés et liquéfiés (à l'exception de l'acétylène) -
Contrôle au moment du remplissage (ISO 24431:2016)
Ta slovenski standard je istoveten z: EN ISO 24431:2016
ICS:
23.020.35 Plinske jeklenke Gas cylinders
SIST EN ISO 24431:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 24431:2017
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SIST EN ISO 24431:2017
EN ISO 24431
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2016
EUROPÄISCHE NORM
ICS 23.020.35
English Version
Gas cylinders - Seamless, welded and composite cylinders
for compressed and liquefied gases (excluding acetylene) -
Inspection at time of filling (ISO 24431:2016)
Bouteilles à gaz - Bouteilles à gaz comprimés et Gasflaschen - Nahtlose, geschweißte und Composite-
liquéfiés (à l'exception de l'acétylène) sans soudure, Flaschen für verdichtete und verflüssigte Gase
soudées et composites - Contrôle au moment du (ausgenommen Acetylen) - Inspektion zum Zeitpunkt
remplissage (ISO 24431:2016) des Füllens (ISO 24431:2016)
This European Standard was approved by CEN on 13 September 2016.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 24431:2016 E
worldwide for CEN national Members.
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SIST EN ISO 24431:2017
EN ISO 24431:2016 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 24431:2017
EN ISO 24431:2016 (E)
European foreword
This document (EN ISO 24431:2016) has been prepared by Technical Committee ISO/TC 58 “Gas
cylinders” in collaboration with 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 May 2017, and conflicting national standards shall be
withdrawn at the latest by May 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] 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.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 24431:2016 has been approved by CEN as EN ISO 24431:2016 without any modification.
3
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SIST EN ISO 24431:2017
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SIST EN ISO 24431:2017
INTERNATIONAL ISO
STANDARD 24431
Second edition
2016-11-01
Gas cylinders — Seamless, welded
and composite cylinders for
compressed and liquefied gases
(excluding acetylene) — Inspection at
time of filling
Bouteilles à gaz — Bouteilles à gaz comprimés et liquéfiés (à
l’exception de l’acétylène) sans soudure, soudées et composites —
Contrôle au moment du remplissage
Reference number
ISO 24431:2016(E)
©
ISO 2016
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SIST EN ISO 24431:2017
ISO 24431:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
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Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
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SIST EN ISO 24431:2017
ISO 24431:2016(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Identification of cylinder owner . 4
5 Filling inspection . 5
5.1 General . 5
5.2 Verification of serviceable condition of individual cylinders before filling . 5
5.2.1 General criteria . . . 5
5.2.2 Exterior condition . 5
5.2.3 Interior condition . 7
5.2.4 Cylinder tare . 7
5.2.5 Calculation of weight of gas to be filled into the cylinder . 8
5.2.6 Provisions for visually inspecting cylinders fitted with coverings . 8
5.2.7 Verification of the integrity of permanent attachments . 9
5.2.8 Verification of valve integrity and suitability . 9
5.2.9 Provisions for palletized cylinders .10
5.2.10 Rejected cylinders .10
5.3 Verification during filling .10
5.4 Verification after filling .10
5.4.1 General.10
5.4.2 Verification of gas tightness .10
5.4.3 Verification of correct filling pressure .11
5.4.4 Verification of correct filling weight .11
5.4.5 Verification of valve protection .11
5.4.6 Verification of correct product labelling .11
6 Cylinders rejected for filling .11
Annex A (informative) Residual pressure check .12
Annex B (informative) Example of a procedure to establish a correct tare .13
Bibliography .14
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SIST EN ISO 24431:2017
ISO 24431:2016(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 on 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 the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 58, Gas cylinders, Subcommittee SC 4,
Operational requirements for gas cylinders.
This second edition cancels and replaces the first edition (ISO 24431:2006), which has been technically
revised with the following changes.
— This edition has been restructured and includes additional provisions for the inspection before,
during and after filling of composite cylinders (Types 2 to 5 inclusive).
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SIST EN ISO 24431:2017
ISO 24431:2016(E)
Introduction
This International Standard covers requirements that reflect current practice and experience.
Each transportable gas cylinder is inspected at the time of filling in order to establish that
— it has no defects which render it unsafe for filling or continued use,
— it can be identified and complies with the relevant requirements with regard to marking (e.g. within
test period, labelling, colour coding and completeness of its accessories), and
— its valve functions satisfactorily.
The cylinder filling inspection is carried out exclusively by persons who have the appropriate training
and competencies, so as to ensure that each cylinder is safe for continued use.
Guidance and requirements provided in this International Standard allow fillers to determine when
cylinders should be rejected for filling. This International Standard is intended to be used as a basis for
developing specific operating procedures for a filling operation.
CAUTION — Some of the tests specified in this International Standard involve the use of
processes which could lead to a hazardous situation.
This International Standard is intended to be used under a variety of national regulatory regimes, but has
[1]
been written so that it is suitable for the application of the UN Model Regulations. Attention is drawn
to requirements in the relevant national regulations of the country (countries) where the cylinders are
intended to be used that might override the requirements given in this International Standard. Where
there is any conflict between this International Standard and any applicable regulation, the regulation
always takes precedence.
In International Standards, weight is equivalent to a force, expressed in Newtons. However, in common
parlance (as used in terms defined in this International Standard), the word “weight” continues to be
used to mean “mass”, although this practice is deprecated (see ISO 80000-4).
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SIST EN ISO 24431:2017
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SIST EN ISO 24431:2017
INTERNATIONAL STANDARD ISO 24431:2016(E)
Gas cylinders — Seamless, welded and composite cylinders
for compressed and liquefied gases (excluding acetylene)
— Inspection at time of filling
1 Scope
This International Standard specifies the inspection requirements at the time of filling, and applies
to seamless or welded transportable gas cylinders made of steel or aluminium-alloy (Type 1), and for
composite transportable gas cylinders (Types 2 to 5 inclusive) for liquefied or compressed gases of a
water capacity up to 150 l. It may be applicable to cylinders and tubes with a water capacity between
150 l and 450 l, provided they are inspected and filled as individual cylinders and tubes.
This International Standard does not apply to acetylene cylinders, bundles of cylinders, tubes, multiple-
element gas container (MEGCs) or battery vehicles.
This International Standard may also be applicable to LPG. For specific LPG applications, refer to
ISO 10691.
For cylinders manifolded in bundles, refer to ISO 11755.
2 Normative references
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 6406, Gas cylinders — Seamless steel gas cylinders — Periodic inspection and testing
ISO 7225, Gas cylinders — Precautionary labels
ISO 10460, Gas cylinders — Welded carbon-steel gas cylinders — Periodic inspection and testing
ISO 10461, Gas cylinders — Seamless aluminium-alloy gas cylinders — Periodic inspection and testing
ISO 11623, Gas cylinders — Composite construction — Periodic inspection and testing
ISO 13769, Gas cylinders — Stamp marking
ISO 25760, Gas cylinders — Operational procedures for the safe removal of valves from gas cylinders
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
compressed gas
gas which when packaged under pressure for transport is entirely gaseous at –50 °C
Note 1 to entry: This category includes all gases with a critical temperature less than or equal to –50 °C.
3.2
covering
protective or non-protective, transparent or non-transparent, device or attachment that can interfere
with an external visual inspection
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SIST EN ISO 24431:2017
ISO 24431:2016(E)
3.3
cylinder marking
permanent and durable information on the cylinder required by the relevant design standard and/or
ISO 13769 and the regulations in the country(ies) of use
3.4
empty weight
mass of the cylinder including all permanent attachments (e.g. neckring, footring), but excluding the
mass of valve, valve cap or valve guard and any coating
Note 1 to entry: See Introduction for terminology regarding weight and mass.
3.5
examination
process having the object of determining a condition by judgement
Note 1 to entry: The examination results in a pass or fail or further measurement, testing or gauging.
[SOURCE: ISO 10286:2015]
3.6
fibre
continuous filament of glass, aramid, carbon or other material
3.7
filler
person (or persons) responsible for inspection (3.10) prior to, during and immediately after filling, who
has received an appropriate level of training for the work involved
3.8
filling pressure
pressure to which a cylinder is filled at the time of filling
Note 1 to entry: Filling pressure varies according to the gas temperature in the cylinder, which is dependent on
the charging parameters and ambient conditions. It is normally higher than the working pressure (3.27) (because
of the heat of compression) and always less than the test pressure.
3.9
filling ratio
ratio of the mass of gas to the mass of water at 15 °C that would fill completely a cylinder fitted
ready for use
Note 1 to entry: Synonyms are filling factor and filling degree, often expressed in kg/l or similar.
[SOURCE: ISO 10286:2015]
3.10
inspection
evaluation of conformity by observation and judgment accompanied as appropriate by measurement,
examination (3.5), testing or gauging
[SOURCE: ISO 10286:2015]
3.11
liner
inner portion of the composite cylinder comprising a metallic or non-metallic vessel, whose purpose is
to both contain the gas and transmit the gas pressure to the composite overwrap
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SIST EN ISO 24431:2017
ISO 24431:2016(E)
3.12
liquefied gas
gas which, when packaged under pressure, is partially liquid at temperatures above –50 °C
Note 1 to entry: A distinction is made between
— high pressure liquefied gas, a gas with a critical temperature between –50 °C and +65 °C, and
— low pressure liquefied gas, a gas with a critical temperature above +65 °C.
3.13
maximum permissible filling weight
maximum permissible filling mass
maximum mass of gas in kg which is allowed in a filled cylinder
Note 1 to entry: This term applies to liquefied gas (3.12).
3.14
pallet
device for handling several cylinders at the same time
3.15
pressure relief device
device that protects the cylinder against overpressurization
Note 1 to entry: This is a collective term that includes a bursting disk, fusible plug or pressure relief valve.
3.16
protective attachments
component (or components) connected to the cylinder that prevents or resists damage to the cylinder
and/or valve
Note 1 to entry: Some protective attachments are designed to be removed at the time of requalification or prefill
inspection (3.10).
3.17
service life
number of years a cylinder is permitted to be in service
Note 1 to entry: Usually applied to composite designs, and when required, the service life is marked in accordance
with an applicable standard or regulation (e.g. “FINAL 2019/10” in ISO 13769).
3.18
sleeve
thin covering (3.2) fitted to the outside surface of the cylinder such as by stretching or heat shrinking
Note 1 to entry: Some sleeves are designed to be removed at the time of prefill inspection (3.10).
3.19
rejected cylinder
cylinder not fit for filling in its present condition
3.20
tare
weight of the cylinder when empty, including accessories fitted and coatings as presented for filling
3.21
total weight
total mass
tare (3.20) of the cylinder plus the maximum permissible filling weight (3.13)
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SIST EN ISO 24431:2017
ISO 24431:2016(E)
3.22
Type 1 cylinder
all metal cylinder
3.23
Type 2 cylinder
hoop wrapped cylinder with a load sharing metal liner (3.11) and composite reinforcement only on the
cylindrical (sidewall) part
3.24
Type 3 cylinder
fully wrapped cylinder with a load sharing metal liner (3.11) and composite reinforcement on both the
cylindrical part and dome ends
3.25
Type 4 cylinder
fully wrapped cylinder with a non-load sharing liner (3.11) and composite reinforcement on both the
cylindrical portion and the dome ends
[SOURCE: ISO 11119-3:2013]
3.26
Type 5 cylinder
fully wrapped cylinder without a liner (3.11) and with composite reinforcement on both the cylindrical
portion and dome ends
[SOURCE: ISO 11119-3:2013]
3.27
working pressure
settled pressure of a compressed gas (3.1) at a reference temperature of 15 °C in a full gas cylinder
Note 1 to entry: In North America, service pressure is often used to indicate a similar condition, usually at 21,1 °C
(70 °F).
Note 2 to entry: In East Asia, service pressure is often used to indicate a similar condition.
3.28
verification
confirmation, by examination (3.5) of objective evidence, that specified requirements have been fulfilled
[SOURCE: ISO 10286:2015]
4 Identification of cylinder owner
Some country’s regulations and filling organizations require verification of ownership of the cylinder
before filling and forbid to fill cylinders that are not owned by the filling organization except if the
owner has authorized filling.
The filler may request technical information from the cylinder owner to verify that the cylinder is safe
to fill.
In all cases, if the owner cannot be identified, or if the owner or owner’s representative does not
authorize the filling of the cylinder, the cylinder shall not be accepted for filling.
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SIST EN ISO 24431:2017
ISO 24431:2016(E)
5 Filling inspection
5.1 General
Each cylinder shall be inspected by the filler before, during and immediately after filling, as indicated
in this Clause.
5.2 Verification of serviceable condition of individual cylinders before filling
5.2.1 General criteria
The filler shall establish that
a) the information required for filling (e.g. next requalification date, filling pressure, gas identification)
is present on the cylinder,
b) the cylinder and/or valve are not on a prohibited fill list,
c) the cylinder has not exceeded its due date for periodic inspection and testing,
d) the cylinder has not exceeded its service life (if applicable),
e) the cylinder and valve (such as valve outlet, material of construction and specification) are
compatible with the intended gas content and the condition (pressure or weight as applicable) to
which the cylinder is to be filled,
f) the cylinder is permitted for filling in the country of the filling station,
g) the cylinder has not been subject to unauthorized modifications, and
h) the intended gas contents correspond to any identification label and shoulder or body colour on the
cylinder through verification of the cylinder’s markings and the colour coding (e.g. by reference to
ISO 7225 and ISO 32) or by questioning the owner of the cylinder.
NOTE Not all countries require standardized colours.
Cylinders not meeting these criteria shall be rejected for filling and handled in accordance with Clause 6.
5.2.2 Exterior condition
5.2.2.1 General requirements
Before an individual cylinder can be filled, the filler shall establish that
a) the cylinder does not show any signs of having undergone any unauthorized modifications, such as
but not limited to, welding of attachments to the cylinder or additional stamp markings,
b) the external surface of the cylinder is clean and free of foreign material (i.e. such that the cylinder
can be assessed for physical damage that would prevent it from being filled safely). Possible
variations to this are those cylinders fitted with a covering or protective attachment, in which case,
the requirements of 5.2.6 shall first be considered, and
c) the cylinder is free from abnormalities as described in ISO 6406, ISO 10460, ISO 10461 or ISO 11623.
Typical abnormalities include, but are not limited to
— arc burns,
— bulging,
— cracks,
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SIST EN ISO 24431:2017
ISO 24431:2016(E)
— dents,
— deep cuts,
— gouges,
— severe corrosion,
— unauthorized stamp markings,
— heat/fire damage (e.g. discoloration of coating, charred or burnt paint and/or labelling, melted
or distorted plastic valve handwheel or other attachments), or
— mechanical damage.
In addition, cylinders of composite design (Types 2 to 5) shall include an inspection of the composite
material for these abnormalities, as well as those described in 5.2.2.2. In particular, composite cylinders
with coverings that exhibit exterior impact damage shall be handled in accordance with 5.2.6.
Cylinders not meeting these criteria shall be rejected for filling and handled in accordance with
Clause 6. In case of doubt or obvious abnormalities, the cylinder shall be rejected for filling and handled
in accordance with Clause 6.
5.2.2.2 Additional provisions for composite cylinders (Types 2 to 5)
5.2.2.2.1 Composite overwrap
Composite cylinders can exhibit unique damage of their composite overwrap and thus shall be inspected
for the following.
a) Abrasion damage. Abrasion damage is caused by wearing, grinding or rubbing away by friction
of the overwrap material. “Flat spots” evident on the surface could indicate excessive loss of
composite overwrap thickness.
b) Damage from cuts. Cuts or gouges are caused by contact with sharp objects in such a way as to cut
into the composite overwrap, reducing its thickness at that point.
c) Impact damage. Impact damage can appear as hairline cracks in the resin, or delamination or cuts
of the composite overwrap. The resin can have a frosted or smashed appearance.
d) Delamination. Delamination is a separation of layers of strands, or of the strands themselves, of
the composite overwrap. It also can appear as a whitish patch, like a blister or an air space beneath
the surface.
e) Heat or fire damage. Heat or fire damage can be evident by discolouration, charring, loss of resin
or burning of the composite overwrap, labels, paint or non-metallic components of the valve.
f) Chemical attack. Chemical attack would appear as the dissolution of the resin
...
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