EN ISO 11623:2015
(Main)Gas cylinders - Composite construction - Periodic inspection and testing (ISO 11623:2015, Corrected version 2017-02)
Gas cylinders - Composite construction - Periodic inspection and testing (ISO 11623:2015, Corrected version 2017-02)
ISO 11623:2015 specifies the requirements for periodic inspection and testing and to verify the integrity for further service of hoop-wrapped and fully-wrapped composite transportable gas cylinders, with aluminium-alloy, steel or non-metallic liners or of linerless construction (Types 2, 3, 4, and 5), intended for compressed, liquefied or dissolved gases under pressure, of water capacity from 0,5 l up to 450 l.
ISO 11623:2015 is written to address the periodic inspection and testing of composite cylinders constructed to ISO 11119‑1, ISO 11119‑2, and ISO 11119‑3 standards and can be applied to other composite cylinders designed to comparable standards when authorized by the competent authority.
As far as practicable, this International Standard also can be applied to cylinders of less than 0,5 l water capacity.
Gasflaschen - Verbundbauweise (Composite-Bauweise) - Wiederkehrende Inspektion und Prüfung (ISO 11623:2015, korrigierte Fassung 2017-02)
Diese Internationale Norm legt die Anforderungen an die wiederkehrende Inspektion und Prüfung von umfangs- und vollumwickelten ortsbeweglichen Gasflaschen aus Verbundwerkstoffen (Composite-Flaschen) mit Linern aus Aluminiumlegierungen, Stahl oder nichtmetallischen Werkstoffen oder Flaschenbauweisen ohne Liner mit einem Fassungsraum von 0,5 l bis 450 l fest, welche zur Verwendung mit verdichteten, verflüssigten oder unter Druck gelösten Gasen vorgesehen sind.
Diese Norm wurde geschrieben, um die wiederkehrende Inspektion und Prüfung von nach ISO 11119-1, ISO 11119-2 und ISO 11119-3 ausgelegten Composite-Flaschen zu beschreiben und darf mit Genehmigung der zuständigen Behörde auch für nach vergleichbaren Normen ausgelegte Composite-Flaschen angewendet werden.
Soweit möglich, darf diese Internationale Norm auch für Flaschen mit einem Fassungsraum kleiner als 0,5 l angewendet werden.
Diese Internationale Norm legt die Anforderungen an die wiederkehrende Inspektion und Prüfung fest, um die Unversehrtheit solcher Gasflaschen für den weiteren Betrieb zu überprüfen.
Bouteilles à gaz - Construction composite - Contrôles et essais périodiques (ISO 11623:2015, Version corrigée 2017-02)
ISO 11623:2015 spécifie les exigences relatives au contrôle et essais périodiques des bouteilles à gaz en matériau composite transportables, frettées ou entièrement bobinées, dotées ou non d'un liner en alliage d'aluminium, en acier ou non-métallique (Types 2, 3, 4, et 5), destinées à contenir des gaz comprimés, liquéfiés ou dissous sous pression et ayant une capacité en eau comprise entre 0,5 l et 450 l inclus, ainsi que la vérification de leur intégrité pour leur maintien en service.
ISO 11623:2015 est élaborée afin de couvrir les contrôles et essais périodiques des bouteilles gaz en matériau composite construites conformément aux normes ISO 11119‑1, ISO 11119‑2, et ISO 11119‑3 et peut être étendue à d'autres bouteilles en matériau composite conçues conformément à des normes comparables lorsque l'autorité compétente l'autorise.
Dans la mesure du possible, la présente Norme internationale peut également être appliquée aux bouteilles ayant une capacité inférieure à 0,5 l.
Plinske jeklenke - Kompozitni materiali - Periodični pregledi in preskusi (ISO 11623:2015)
Ta mednarodni standard opredeljuje zahteve za periodične preglede in preskuse ter preverjanje celovitosti za namen nadaljnje uporabe premičnih jeklenk za plin, obročasto in popolnoma obvitih s kompozitno maso, s tuljavami iz aluminijeve zlitine, jekla ali materiala, ki ni kovina, ali s konstrukcijo brez tuljav (tipi 2, 3, 4 in 5), ki so namenjeni za stisnjene, utekočinjene ali raztopljene pline pod tlakom, s prostornino vode od 0,5 do 450 l.
Ta mednarodni standard obravnava periodične preglede in preskuse kompozitnih jeklenk, izdelanih v skladu s standardi ISO 11119-1, ISO 11119-2 in ISO 11119-3, pri čemer ga je mogoče uporabiti za druge kompozitne jeklenke, zasnovane v skladu s primerljivimi standardi, če to odobri pristojni organ. V smislu praktičnosti je mogoče ta mednarodni standard uporabiti za jeklenke s prostornino vode, manjšo od 0,5 l.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2016
1DGRPHãþD
SIST EN ISO 11623:2002
3OLQVNHMHNOHQNH.RPSR]LWQLPDWHULDOL3HULRGLþQLSUHJOHGLLQSUHVNXVL ,62
Gas cylinders - Composite construction - Periodic inspection and testing (ISO
11623:2015)
Gasflaschen - Verbundbauweise - Wiederkehrende Inspektion und Prüfung (ISO
11623:2015)
Bouteilles à gaz transportables - Contrôles et essais périodiques des bouteilles à gaz en
matériau composite (ISO 11623:2015)
Ta slovenski standard je istoveten z: EN ISO 11623:2015
ICS:
23.020.30 7ODþQHSRVRGHSOLQVNH Pressure vessels, gas
MHNOHQNH cylinders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 11623
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2015
EUROPÄISCHE NORM
ICS 23.020.30 Supersedes EN ISO 11623:2002
English Version
Gas cylinders - Composite construction - Periodic
inspection and testing (ISO 11623:2015)
Bouteilles à gaz - Construction composite - Contrôles et Gasflaschen - Verbundbauweise - Wiederkehrende
essais périodiques (ISO 11623:2015) Inspektion und Prüfung (ISO 11623:2015)
This European Standard was approved by CEN on 3 October 2015.
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
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11623:2015 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 11623:2015) 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 June 2016, and conflicting national standards shall be
withdrawn at the latest by June 2016.
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 supersedes EN ISO 11623:2002.
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 11623:2015 has been approved by CEN as EN ISO 11623:2015 without any modification.
INTERNATIONAL ISO
STANDARD 11623
Second edition
2015-12-01
Gas cylinders — Composite
construction — Periodic inspection
and testing
Bouteilles à gaz — Construction composite — Contrôles et essais
périodiques
Reference number
ISO 11623:2015(E)
©
ISO 2015
ISO 11623:2015(E)
© ISO 2015, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
ISO 11623:2015(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Due dates for periodic inspection and testing . 4
5 Procedures for periodic inspection and testing . 4
5.1 List of procedures . 4
5.2 Heat exposure . 4
6 Identification of cylinder and preparation for periodic inspection and testing .5
7 External visual inspection . 5
7.1 Preparation . 5
7.2 Inspection procedures . 6
7.3 Damage . 6
7.3.1 General. 6
7.3.2 Identification label . 6
7.3.3 Damage levels . 6
7.3.4 Types of damage . 8
7.4 Repairs . 9
8 Internal visual inspection .10
8.1 Safe removal of valve .10
8.2 Internal inspection and cleaning .10
8.2.1 General.10
8.2.2 Metallic liners .10
8.2.3 Linerless and non-metallic liners .10
8.3 Inspection of cylinder neck/shoulder .11
9 Pressure test .12
10 Leak test .12
11 Inspection of valve .12
12 Final operations .12
12.1 Drying and cleaning .12
12.2 Painting .12
12.3 Cylinder re-valving .13
12.4 Check on cylinder tare .13
12.5 Marking .13
12.6 Reference to next test date .13
12.7 Identification of contents .14
12.8 Records .14
13 Rejection and rendering cylinders unserviceable .14
Annex A (normative) Damage criteria for steel wire wound, aluminium-alloy cylinders .22
Annex B (normative) Internal inspection of translucent cylinders .23
Annex C (informative) Intervals between periodic inspection and testing .24
Bibliography .27
ISO 11623:2015(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 WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
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 11623:2002), which has been technically
revised with the following changes:
— up-to-date terminology particularly for the various types of composite cylinders;
— up-to-date normative references for steel and aluminium-alloy liner materials;
— list defects according to severity with an additional set of acceptance/rejection criteria;
— replacement of the procedure regarding obstructed cylinder valve (former Annex A) with a reference
to ISO 25760;
— addition of a new, normative Annex B for the internal inspection of translucent composite cylinders;
— information regarding intervals between periodic inspection and testing based on cylinder type,
formerly listed in Tables 1 through 4, moved into new, informative Annex C;
— update of some photographs to provide sharper examples of damage.
iv © ISO 2015 – All rights reserved
ISO 11623:2015(E)
Introduction
The principal aim of periodic inspection and testing is that at the completion of the test, the
cylinders can be reintroduced into service for a further period of time. It is not possible to identify
all considerations for periodic inspection and testing of composite cylinders in this International
Standard. In such cases or where there is doubt, questions regarding specific cylinders should be
directed to the manufacturer or owner.
This International Standard is intended to be used under a variety of national regulatory regimes,
but has been written so that it is suitable for the application of the UN Model Regulations (see
Reference [1]). 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.
INTERNATIONAL STANDARD ISO 11623:2015(E)
Gas cylinders — Composite construction — Periodic
inspection and testing
1 Scope
This International Standard specifies the requirements for periodic inspection and testing and to verify
the integrity for further service of hoop-wrapped and fully-wrapped composite transportable gas
cylinders, with aluminium-alloy, steel or non-metallic liners or of linerless construction (Types 2, 3, 4,
and 5), intended for compressed, liquefied or dissolved gases under pressure, of water capacity from
0,5 l up to 450 l.
This International Standard is written to address the periodic inspection and testing of composite
cylinders constructed to ISO 11119-1, ISO 11119-2, and ISO 11119-3 standards and can be applied to other
composite cylinders designed to comparable standards when authorized by the competent authority.
As far as practicable, this International Standard also can be applied to cylinders of less than 0,5 l
water capacity.
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 32, Gas cylinders for medical use — Marking for identification of content
ISO 6406, Gas cylinders — Seamless steel gas cylinders — Periodic inspection and testing
ISO 7225, Gas cylinders — Precautionary labels
ISO 10461, Gas cylinders — Seamless aluminium-alloy gas cylinders — Periodic inspection and testing
ISO 11114-2, Gas cylinders — Compatibility of cylinder and valve materials with gas contents — Part 2:
Non-metallic materials
ISO 11621, Gas cylinders — Procedures for change of gas service
ISO 13341, Gas cylinders — Fitting of valves to gas cylinders
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
composite overwrap
fibres (3.3) and matrix (3.14) taken together as a combined unit
ISO 11623:2015(E)
3.2
exterior coating
layer of material applied to the cylinder as a protective coating not intended to be removed or for
cosmetic purposes
EXAMPLE Gel coat and paint.
Note 1 to entry: Not all composite cylinders will have a special exterior coating.
3.3
fibre
load-carrying part of the composite overwrap (3.1)
EXAMPLE Glass, aramid or carbon.
3.4
fully-wrapped composite cylinder without liner
cylinder manufactured only from continuous fibre (3.3) strands in a matrix (3.14) wrapped in both
circumferential and longitudinal directions
Note 1 to entry: Also known as Type 5.
3.5
fully-wrapped composite cylinder with liner
steel, aluminium-alloy or non-metallic liner (3.10) wrapped with continuous fibre (3.3) strands in a
matrix (3.14) both circumferentially and longitudinally
Note 1 to entry: Also known as either Type 3 (metallic liner) or Type 4 (non-load sharing liner).
3.6
hoop-wrapped composite cylinder
seamless steel or aluminium-alloy liner (3.10) wrapped with continuous fibre (3.3) strands or steel wire
[embedded in a matrix (3.14)] around only the cylindrical body of the liner, leaving the metal in the neck
and base regions exposed
Note 1 to entry: Also known as Type 2.
3.7
translucent composite cylinder
cylinder that permits the passage of light
3.8
identification label
label containing the permanent markings required by the relevant design specification
3.9
design life
maximum life (in number of years) to which a composite cylinder or tube is designed and approved in
accordance with the applicable standard
3.10
liner
inner portion of the composite cylinder designed both to contain the gas and transmit the gas pressure
to the composite overwrap (3.1)
3.11
non-metallic liner
liner (3.10) made from thermoplastic, thermosetting, or elastomeric material
3.12
protective sleeve
transparent or non-transparent cover fitted to the outside surface of the cylinder
2 © ISO 2015 – All rights reserved
ISO 11623:2015(E)
3.13
repair
minor refurbishment to return the cylinder to its acceptable condition
EXAMPLE Adding resin.
3.14
matrix
material used to bind and hold the fibres (3.3) in place
Note 1 to entry: The matrix is sometimes called resin.
3.15
rejected cylinder
cylinder not fit for service or which needs to be set aside for further evaluation or testing in its
present condition
3.16
Level 1 damage
DEPRECATED: Level 1 condition
minor damage that can occur during normal use
3.17
Level 2 damage
DEPRECATED: Level 2 condition
damage that is more severe than Level 1 (3.16) and, where repair (3.13) is authorized and where the
cylinder can be returned to service, or based upon the recommendations of the manufacturer to be
classified as Level 1 or Level 3 (3.18)
3.18
Level 3 damage
DEPRECATED: Level 3 condition
damage that requires a cylinder to be condemned, i.e. rendered unfit for continued service
3.19
bulge
visible swelling of the wall
3.20
crack
split or separation in the material, typically appearing as a line on the surface
3.21
crease
off-colour linear or non-linear feature formed as a result of previous localized over-stressing
3.22
protective attachment
component connected to the cylinder that prevents or resists damage to the composite cylinder
EXAMPLE Casing.
Note 1 to entry: Some protective attachments are designed to be removed at the time of periodic inspection and
testing.
ISO 11623:2015(E)
4 Due dates for periodic inspection and testing
A cylinder shall be due for periodic inspection and testing on its first receipt by a filler after the expiry
of the due date.
NOTE There is no general requirement for the user to return a gas cylinder before the contents have been
used even though the test interval has lapsed.
When the design life has expired, the cylinder shall not be refilled and shall be removed from service
when presented for the next filling (see Clause 13).
In some jurisdictions, it is the responsibility of the owner or user to submit cylinders used for emergency
purposes for periodic inspection and testing within the specified interval.
5 Procedures for periodic inspection and testing
5.1 List of procedures
The inspection, testing and repair of composite cylinders shall be carried out only by persons competent
in the subject to ensure that the cylinders are fit for continued safe use. Care shall be taken to ensure
that during the retest procedure, cylinders are handled carefully, particularly with respect to loading
in and out of metal pallets, and ensuring cylinders are not dropped to cause any damage.
Each cylinder shall be submitted to periodic inspection and testing. The following procedures
form the requirements for this periodic inspection and testing and are explained more fully in this
International Standard:
— Identification of cylinder and preparation for periodic inspection and testing (see Clause 6);
— External visual inspection (see Clause 7);
— Safe removal of valve (see 8.1);
— Internal inspection and cleaning (see 8.2);
— Pressure test (see Clause 9);
— Leak test (see Clause 10);
— Inspection of valve (see Clause 11);
— Final operations (see Clause 12); and
— Rejection and rendering cylinders unserviceable (see Clause 13).
The external and internal visual examination (see Clauses 7 and 8) shall be carried out prior to the
pressure test (see Clause 9). It is recommended that the other tests are performed in the sequence listed
above; however, when a valve is removed, ISO 25760 shall be observed.
Cylinders that fail inspection or testing shall be rejected (see Clause 13). When a cylinder passes the
above-listed procedures but the condition of the cylinder remains in doubt, additional testing shall be
performed to confirm its suitability for continued service or the cylinder shall be rendered unserviceable.
Depending on the reason for the rejection, cylinders may be recovered and/or repaired (see 7.4).
5.2 Heat exposure
When cylinders are refurbished during periodic inspection, it might be necessary to expose them to
heat, for example, during initial cleaning, or as part of a stoving operation when painting or powder
coating the cylinder. This heat exposure can affect the mechanical properties of the liners and/or the
finished composite cylinder.
4 © ISO 2015 – All rights reserved
ISO 11623:2015(E)
It is therefore essential that information on precise heat-effect temperatures from the cylinder
manufacturer be available; in the absence of this information, cylinders shall not be exposed to a
temperature exceeding 70 °C during refurbishment. If the cylinder’s allowable temperature is greater
than 70 °C, then that temperature and the maximum exposure time at that temperature shall be
indicated on the cylinder by the manufacturer. Otherwise, the inspector shall obtain documentation
indicating the cylinder’s suitability for higher temperatures.
6 Identification of cylinder and preparation for periodic inspection and testing
Before any work is carried out, the relevant cylinder markings (e.g. see ISO 13769) and the gas contents
(e.g. see ISO 7225) shall be identified. First, the marking shall be checked to ensure that the cylinder in
question is within its design life. When composite cylinders have been designed and manufactured for
a limited design life, this is indicated on the cylinder marking.
The cylinder shall be depressurized and emptied in a safe, controlled manner before proceeding. Prior
to valve removal, the user shall follow procedures described in ISO 25760. In particular, a positive
check shall be made to ensure that the cylinder is empty of gas. Provided the requirements as stated in
ISO 25760 have been complied with, the cylinder shall be depressurized safely and the valve removed.
Cylinders with unknown gas contents shall be emptied as if the gas is dangerous (i.e. toxic, flammable or
oxidizing). When the valve is non-functional, cylinders shall be emptied safely as described in ISO 25760.
7 External visual inspection
7.1 Preparation
7.1.1 The composite material including any exterior coating applied for protection shall never be
removed for the visual inspection.
Permanent attachments of the composite cylinder shall not be removed prior to inspection, provided
that these attachments are part of the original design and the manufacturer can produce documentation
necessary to identify which defects have no adverse effect on the cylinder’s integrity.
Markings specific to permanent attachments on the cylinder shall indicate if the attachments must remain
in place at the time of the periodic inspection and testing. If such markings are not present, the cylinder
manufacturer shall be consulted to establish whether the permanent attachments need to be removed.
7.1.2 When a transparent protective sleeve is used, it may be left in place as long as the composite
wrapping can be inspected effectively without its removal.
When a non-transparent protective sleeve is used that is not part of the cylinder design, it shall be
removed and only refitted after this inspection and the pressure test.
7.1.3 Each cylinder shall be cleaned and have all loose foreign matter removed from its external surface
by a suitable method (e.g. washing, light brushing, controlled water jet cleaning, plastic bead blasting).
Grit and shot blasting are not suitable. Chemical cleaning agents, paint strippers, and solvents shall
not be used unless it has been established that they would not have an adverse effect on the cylinder
or its materials.
Care shall be taken not to remove any evidence of in-service damage (e.g. heat and fire damage), which
could affect the outcome of this inspection (see Table 1).
Composite cylinders differ from their metal counterparts in that a competent person may repair them
when only limited damage has taken place (see 7.4). These limits are defined in Table 1; following this
repair, cylinders shall be subjected to a pressure test before being returned to service.
ISO 11623:2015(E)
7.2 Inspection procedures
The acceptance/rejection criteria given in Table 1 shall be followed as a minimum. The inspection body
shall contact the cylinder manufacturer to establish whether there are less stringent rejection criteria
for the particular cylinder design. In case of doubt, the inspection body shall make reference to the
design drawing of the cylinder. Hoop-wrapped cylinders as well as those with exposed external metal
surfaces, especially at the interface with the composite overwrap, shall be inspected in accordance
with the applicable clauses of the relevant standard (i.e. ISO 6406 for steel cylinders and ISO 10461 for
aluminium-alloy cylinders).
The external surface shall be inspected for damage to the composite overwrap. There are three levels
of damage that shall be considered (see 7.3.3); of these, only two can be repaired (see Table 1).
7.3 Damage
7.3.1 General
Damage to the composite overwrap can appear in many forms, and examples of these are described
in 7.3.3 to 7.3.4. The acceptance/rejection criteria are specified in Table 1, which refers to defined
damage levels and the types of damage. Care shall be taken to establish the total extent of damage
from impact (see 7.3.4.3) and delamination (see 7.3.4.4) as surface appearance might not indicate the
full extent of the damage.
Annex A specifies additional damage criteria for steel wire wound, aluminium-alloy cylinders.
Whenever cylinder damage is discovered, the likely cause of the damage shall be investigated.
When damage is caused by installation (e.g. trailer or bundle), severity or conditions of service, or by
improper cylinder use, the inspector should advise the cylinder owner of the need to take corrective
action to prevent or reduce further cylinder damage, or to prevent damage to a replacement cylinder.
Such actions should be developed with the manufacturer of the cylinder and the original installer.
7.3.2 Identification label
If the label is illegible, the manufacturer of the cylinder shall be contacted.
The manufacturer may only affix a supplementary identification label to the cylinder if, as a minimum,
the original label’s serial number is still clearly legible.
7.3.3 Damage levels
7.3.3.1 General
In the absence of acceptance criteria based upon testing, all Level 2 damage shall be identified as
Level 3 damage. The surface of the cylinder shall be inspected for evidence of damage. Damage shall be
evaluated in accordance with Table 1.
7.3.3.2 Level 1 damage
Cylinders with no external visual damage or minor damage are categorized as Level 1 damage and are
acceptable, hence no repair is required. Such damage normally has no adverse effects on the safety of
the cylinder and its continued use. Scratched paint or nicks that have no appreciable depth in metal, or
similar damage in the composite cylinder paint or resin where there are no visible frayed fibres, are
considered to be of this level of damage.
6 © ISO 2015 – All rights reserved
ISO 11623:2015(E)
7.3.3.3 Level 2 damage
Level 2 damage is rejectable damage that requires repair, testing, or rendering the cylinder
unserviceable, as advised by the cylinder manufacturer. Level 2 damage is also reserved for conditions
specified by the manufacturer, which can differ from Level 1 or Level 3 damage outlined in Table 1.
Level 2 damage is either shown to be acceptable (Level 1) by the manufacturer’s test and investigation
results, or else evaluated to be Level 3.
7.3.3.4 Level 3 damage
Level 3 damage is sufficiently severe that the cylinder shall not be repaired, but shall be rejected and
subsequently rendered unserviceable.
Table 1 — Acceptance/rejection criteria
Level of damage
Type of damage Level 1 Level 2 Level 3
Acceptable damage Rejectable damage Condemned damage
(requiring additional (not repairable)
inspections or repairs)
Abrasion damage Damage to the following Damage greater than Level 1 but Damage greater than:
or damage from depth is acceptable: less than Level 3 shall be referred
— 15 % of composite
cuts to the manufacturer for repair
a
Less than 0,25 mm overwrap thickness for
b
procedures. Otherwise, the dam-
fully-wrapped cylin-
age shall be considered Level 3.
ders;
If the manufacturer does not pro-
— 30 % of composite
vide repair instructions, the dam-
overwrap thickness
age shall be considered Level 3.
for hoop-wrapped
cylinders.
Impact damage Damage from impact, which Damage greater than Level 1 shall Damage from impact
causes a frosted appearance be referred to the manufacturer that causes permanent
b
or hairline cracking in the for evaluation. deformation (e.g. dent).
impact area that is less than
Otherwise, the damage shall be
25 mm in diameter without
considered Level 3.
permanent deformation, is
b
acceptable.
Delamination No visible delamination Loose fibre ends from the termina- Delaminating fibres not
tion of the wrapping process shall included in Level 2.
be repaired.
Heat or fire dam- When the composite over- Damage greater than Level 1 Cylinders with evi-
age wrap is only soiled from no repair allowed – consider as dence of heat or fire
smoke or other debris and Level 3. damage greater than
is found to be suitable for Level 1 shall be ren-
b
further service. Additional dered unserviceable.
attention shall be given to
cylinders with an alumini-
um-alloy liner/boss or a non-
load sharing liner.
Structural damage When the cylinder is found No repair allowed All cylinders
to be suitable for further
b
service
a
The depth measurement starts at the surface of the cylinder, including coating if present, but excluding protective
sleeves that are not part of the cylinder design.
b
This needs to be established by further investigation.
ISO 11623:2015(E)
Table 1 (continued)
Level of damage
Type of damage Level 1 Level 2 Level 3
Acceptable damage Rejectable damage Condemned damage
(requiring additional (not repairable)
inspections or repairs)
Chemical attack When the cylinder is found If the chemical’s nature is known, All cylinders if chemi-
to be suitable for further the cylinder manufacturer shall cal unknown.
b
service provide documentation confirm-
Any attack of the fibre.
ing Level 1 or 2. If Level 2, the
manufacturer shall suggest a
b
suitable repair procedure.
Missing/illegible Not applicable In the event that the manufacturer All cylinders that can-
identification label can unmistakably identify the cyl- not be identified and
or markings inder, by at least the serial number, relabelled/remarked.
a new label shall be supplied by
the manufacturer and affixed or
the marks applied either by the in-
spection body or the manufacturer
(see ISO 13769).
Loose permanent Not applicable Repair possible provided manufac- All cylinders other
attachments turer gives written consent. than those in Level 2
Improper repair Not applicable Following a repair (see 7.4), all All cylinders with de-
defects can be repaired a second fects after the second
and final time; the cylinder shall repair.
be retested.
Other damage (of a — Minor damage that would Not applicable Not applicable
cosmetic nature) be considered normal. Such
Small groups of abraded fibres
damage should have no ad-
verse effects on the safety of
the cylinder and its continued
use.
— Damage with no appreci-
able depth
Damaged perma- No damage or minor damage When dented, cracked, broken, If Level 2 damage ex-
nent attachment such as nicks, scratches con- showing other signs of damage ists and replacement of
sistent with normal wear (e.g. discolouration from impact) the damaged attach-
or as advised by the manufactur- ment is not possible
er. Permanent attachment to be
Or
removed and composite cylinder
to be assessed for damage. New If the composite cyl-
attachment may be fitted provided inder shows damage
cylinder suitable for further ser- adjacent to a damaged
vice. area on the attachment
a
The depth measurement starts at the surface of the cylinder, including coating if present, but excluding protective
sleeves that are not part of the cylinder design.
b
This needs to be established by further investigation.
7.3.4 Types of damage
7.3.4.1 Abrasion damage [see Figures 1a) to 1c)]
Abrasion damage is caused by wearing, grinding, or rubbing away by friction of the overwrap material.
Minor abrasion damage to the protective coating or paint is shown in Figures 1a) and 1b). “Flat spots”
evident on the surface could indicate excessive loss of composite overwrap thickness [see Figure 1c)].
8 © ISO 2015 – All rights reserved
ISO 11623:2015(E)
7.3.4.2 Damage from cuts [see Figures 2a) and 2b)]
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.
7.3.4.3 Impact damage [see Figures 3a) and 3b)]
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.
7.3.4.4 Delamination (see Figure 4)
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.
7.3.4.5 Heat or fire damage [see Figures 5a) and 5b)]
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.
7.3.4.6 Structural damage
Structural damage is any evidence of bulges, distorted neck thread connections, depressions not
originally designed, or if, by visual examination of the cylinder interior, there is evidence of damage
involving deformation of the liner.
7.3.4.7 Chemical attack [see Figures 6a) and 6b)]
Chemical attack would appear as the dissolution of the matrix surrounding the fibres. The resulting
cylinder surface can be pitted, feel soft/sticky, discoloured, etc.
7.3.4.8 Loose permanent attachments
Signs of a collar, neck ring or other permanent attachment that is part of the design becoming loose are
causes for rejecting the cylinder.
7.3.4.9 Improper repairs
Signs of damage in the repaired area in excess of Level 1 are causes for rejecting the cylinder.
7.3.4.10 Damaged permanent attachment
Damage to permanent attachments, e.g. cage, outer casing, etc., excluding transparent sleeves (see
7.1.2), that are part of the original cylinder design is Level 3 damage unless the manufacturer provides
an inspection manual of damage criteria based on experimental data.
7.4 Repairs
A resin system may be used to repair composite cylinders. Reference shall be made to the design drawing
of the cylinder, or the manufacturer, for confirmation of the resin system and repair procedure to be used.
All repaired cylinders shall be subjected to a pressure test before being returned to service. After
the pressure test, the repairs shall be examined for lifting, peeling, or delamination of the composite
overwrap. The damage criteria identified in 7.3 shall be used. In the event of a failure, if it can be
established that the repair procedure was inadequate or not followed, then a second and final repair
may be performed.
Any cylinder showing signs of a repair from a previous inspection shall not be repaired in the same area.
ISO 11623:2015(E)
Figures 7a) through 7e) illustrate the sequence of a typical repair procedure.
8 Internal visual inspection
8.1 Safe removal of valve
The cylinder’s valve shall not be removed until it is verified that there is no pressure inside the cylinder.
A valve in the open position does not guarantee that the cylinder is not pressurized. The procedures in
ISO 25760 shall be followed for the safe removal of a valve.
8.2 Internal inspection and cleaning
8.2.1 General
The whole of the internal surface of each cylinder shall be inspected, using an adequate technique and
illumination to identify any imperfections present. Annex B specifies additional internal inspection
requirements for translucent cylinders.
8.2.2 Metallic liners
A cylinder that shows the presence of foreign matter, or signs of more than light surface corrosion, shall
be cleaned internally under closely controlled conditions. Care shall be taken to avoid damaging the
liner and composite materials.
8.2.2.1 Steel liners
Suitable cleaning methods such as shot-blasting, water jet abrasive cleaning, flailing, steam jet, hot
water jet, rumbling, chemical cleaning, or others may be used. The method used to clean the cylinder
shall be a validated, controlled process.
If the cylinder has been cleaned by one of the above methods, it shall be inspected after the cleaning
operation in accordance with the relevant standard for liners (e.g. ISO 6406).
8.2.2.2 Aluminium-alloy liners
Suitable cleaning methods such as water jet abrasive cleaning, flailing, steam jet, hot water jet, chemical
cleaning (see 8.2.3), blasting with glass beads, or others may be used. The method used to clean the
cylinder shall be a validated, controlled process.
Cleaning with material other than aluminium or glas
...
Frequently Asked Questions
EN ISO 11623:2015 is a standard published by the European Committee for Standardization (CEN). Its full title is "Gas cylinders - Composite construction - Periodic inspection and testing (ISO 11623:2015, Corrected version 2017-02)". This standard covers: ISO 11623:2015 specifies the requirements for periodic inspection and testing and to verify the integrity for further service of hoop-wrapped and fully-wrapped composite transportable gas cylinders, with aluminium-alloy, steel or non-metallic liners or of linerless construction (Types 2, 3, 4, and 5), intended for compressed, liquefied or dissolved gases under pressure, of water capacity from 0,5 l up to 450 l. ISO 11623:2015 is written to address the periodic inspection and testing of composite cylinders constructed to ISO 11119‑1, ISO 11119‑2, and ISO 11119‑3 standards and can be applied to other composite cylinders designed to comparable standards when authorized by the competent authority. As far as practicable, this International Standard also can be applied to cylinders of less than 0,5 l water capacity.
ISO 11623:2015 specifies the requirements for periodic inspection and testing and to verify the integrity for further service of hoop-wrapped and fully-wrapped composite transportable gas cylinders, with aluminium-alloy, steel or non-metallic liners or of linerless construction (Types 2, 3, 4, and 5), intended for compressed, liquefied or dissolved gases under pressure, of water capacity from 0,5 l up to 450 l. ISO 11623:2015 is written to address the periodic inspection and testing of composite cylinders constructed to ISO 11119‑1, ISO 11119‑2, and ISO 11119‑3 standards and can be applied to other composite cylinders designed to comparable standards when authorized by the competent authority. As far as practicable, this International Standard also can be applied to cylinders of less than 0,5 l water capacity.
EN ISO 11623:2015 is classified under the following ICS (International Classification for Standards) categories: 23.020.30 - Pressure vessels, gas cylinders; 23.020.35 - Gas cylinders. The ICS classification helps identify the subject area and facilitates finding related standards.
EN ISO 11623:2015 has the following relationships with other standards: It is inter standard links to EN ISO 11623:2002, EN ISO 11623:2023. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN ISO 11623:2015 is associated with the following European legislation: EU Directives/Regulations: 2008/68/EC, 94/55/EC, 96/49/EC, 96/86/EC, 96/87/EC; Standardization Mandates: M/086. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
You can purchase EN ISO 11623:2015 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
표준 EN ISO 11623:2015는 복합재료로 제작된 가스 실린더의 주기적인 검사 및 시험에 대한 요구사항을 명시하고 있으며, 이는 알루미늄 합금, 강철 또는 비금속 라이너로 구성된 실린더의 안전성을 보증하고 추가적인 서비스를 위한 정밀도를 확인하는 데 중점을 두고 있습니다. 이 표준은 매우 다양한 타입의 실린더, 특히 Type 2, 3, 4, 5의 복합 가스 실린더를 다루고 있으며, 이는 압축가스, 액화가스 또는 압축된 가스로 해결된 가스에 사용됩니다. 이 표준의 강점 중 하나는 여러 가지 용량의 실린더를 포함한다는 점으로, 0.5리터에서 450리터까지의 물 용적을 가진 실린더를 대상으로 하고 있습니다. ISO 11119-1, ISO 11119-2, ISO 11119-3와 같은 규격에 따라 제작된 복합 실린더뿐만 아니라, 유사한 기준에 설계된 다른 복합 실린더에도 적용될 수 있으므로, 규정의 유연성이 뛰어납니다. 또한, ISO 11623:2015는 가능한 경우 0.5리터에 미치지 않는 용적의 실린더에도 적용될 수 있도록 작성되어 있어, 더 다양한 사용자와 제조업체에게 혜택을 제공합니다. 이러한 측면에서, 표준은 복합제 가스 실린더의 안전성을 보장하고, 검사 및 시험 절차를 통해 실린더의 무결성을 유지할 수 있도록 필수적인 역할을 합니다. 결과적으로, EN ISO 11623:2015 표준은 가스 실린더의 주기적인 검사와 시험을 위한 필수 기준으로서, 복합재료 가스 실린더의 품질과 안전을 유지하는 데 매우 중요한 문서입니다.
EN ISO 11623:2015は、複合材料製のガスシリンダーに関する標準であり、周期的な検査とテストの要件を定めています。この標準は、アルミニウム合金、鋼または非金属ライナーを使用したホープラップ及びフルラップの輸送用ガスシリンダー（タイプ2、3、4、5）に適用され、圧力下での気体や液化ガス、溶解ガスに対応しています。水容量は0.5リットルから450リットルまでの範囲です。 この標準の強みは、その幅広い適用範囲にあります。ISO 11623:2015は、ISO 11119‑1、ISO 11119‑2、およびISO 11119‑3の基準に従って構築された複合シリンダーの周期的な検査とテストに特化しており、適切な権限により承認された場合には、同等の基準に設計された他の複合シリンダーにも適用可能です。これにより、さまざまな種類のガスシリンダーの安全性と耐久性確保に寄与しています。 さらに、この国際標準は、できる限り0.5リットル未満の水容量のシリンダーにも適用できることを考慮しており、小型シリンダーの周期的な検査・テストに対する柔軟性を提供しています。 EN ISO 11623:2015の関連性は、ガスシリンダーの安全性と信頼性を確保する上で不可欠であることにあります。安全基準を満たすことは、産業界全体の信頼性を向上させ、利用者の安全を守るために重要なステップです。複合構造シリンダーの累積的な市場のニーズに応じて、非常に関連性の高い標準となっています。
The EN ISO 11623:2015 standard is an essential document that specifies the requirements for periodic inspection and testing of composite gas cylinders, particularly those that are hoop-wrapped and fully-wrapped, featuring various types of liners, including aluminium-alloy, steel, or non-metallic, as well as linerless designs. The scope of this standard is comprehensive, applying to transportable gas cylinders intended for compressed, liquefied, or dissolved gases under pressure, covering a significant range in terms of water capacity from 0.5 liters to 450 liters. A notable strength of EN ISO 11623:2015 is its focus on ensuring the integrity and safety of composite cylinders, which are increasingly used in various industries due to their lightweight and durable nature. The standard's clear guidelines on periodic inspection and testing provide a robust framework for maintaining compliance and operational safety, which is crucial for end-users and manufacturers alike. Furthermore, the inclusion of guidance for cylinders constructed to the ISO 11119 suite of standards enhances its relevance and applicability, enabling broader adoption within the industry. Moreover, the explicit allowance for application to other composite cylinders designed to comparable standards upon authorization from the competent authority increases the standard's flexibility and utility. This aspect is particularly significant for manufacturers and users who may deal with a variety of cylinder designs, as it encourages interoperability and expands the potential user base for composite materials. While the standard primarily targets cylinders with capacities from 0.5 liters and above, it also acknowledges that its provisions can be applied as far as practicable to smaller cylinders, thereby enhancing its relevance in a wider context. This inclusive approach ensures that as market demands evolve and new technologies emerge, the EN ISO 11623:2015 standard remains a relevant and valuable resource for manufacturers, regulators, and safety professionals concerned with the ongoing safe use of composite gas cylinders in various applications.
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