Gas cylinders - Composite cylinders and tubes - Periodic inspection and testing (ISO/DIS 11623:2022)

Gasflaschen – Verbundbauweise (Composite-Bauweise) – Wiederkehrende Inspektion und Prüfung (ISO/DIS 11623:2022)

Dieses Dokument legt die Anforderungen an die wiederkehrende Inspektion und Prüfung und an die Überprüfung der Unversehrtheit für den weiteren Betrieb von umfangs  und vollumwickelten ortsbeweglichen Gas¬flaschen und Großflaschen aus Verbundwerkstoffen mit Linern aus Aluminiumlegierungen, Stahl oder nichtmetallischen Werkstoffen oder Flaschenbauweisen ohne Liner (Typ 2, 3, 4 und 5) mit einem Fassungsraum von 0,5 l bis 3 000 l fest, die zur Verwendung mit verdichteten, verflüssigten oder unter Druck gelösten Gasen vorgesehen sind.
Dieses Dokument wurde verfasst, um die wiederkehrende Inspektion und Prüfung von nach ISO 11119 1, ISO 11119 2, ISO 11119 3, ISO 11119 4 und ISO 11515 ausgelegten Flaschen und Großflaschen aus Verbund¬werkstoffen zu beschreiben und kann mit Genehmigung der zuständigen Behörde auch für nach vergleich¬baren Normen ausgelegte Flaschen und Großflaschen aus Verbundwerkstoffen angewendet werden.
Soweit möglich, kann dieses Dokument bei Vorliegen einer Genehmigung durch den Hersteller auch für Flaschen mit einem Fassungsraum von weniger als 0,5 l angewendet werden.
ANMERKUNG   Sofern nicht ausnahmsweise anders vermerkt, bezieht sich die Verwendung des Wortes „Flasche“ in diesem Dokument sowohl auf Flaschen als auch auf Großflaschen.
VORSICHT — Einige der in diesem Dokument festgelegten Prüfungen umfassen die Anwendung von Prozessen, die zu Gefahrensituationen führen könnten.

Bouteilles à gaz - Bouteilles et tubes composites - Contrôles et essais périodiques (ISO/DIS 11623:2022)

Plinske jeklenke - Jeklenke in velike jeklenke iz kompozitnih materialov - Periodični pregledi in preskusi (ISO/DIS 11623:2022)

General Information

Status
Not Published
Public Enquiry End Date
19-Nov-2022
Technical Committee
Current Stage
4020 - Public enquire (PE) (Adopted Project)
Start Date
07-Oct-2022
Due Date
24-Feb-2023
Completion Date
28-Oct-2022

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Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN ISO 11623:2022
01-november-2022
Plinske jeklenke - Jeklenke in velike jeklenke iz kompozitnih materialov -
Periodični pregledi in preskusi (ISO/DIS 11623:2022)

Gas cylinders - Composite cylinders and tubes - Periodic inspection and testing (ISO/DIS

11623:2022)
Gasflaschen – Verbundbauweise (Composite-Bauweise) – Wiederkehrende Inspektion
und Prüfung (ISO/DIS 11623:2022)

Bouteilles à gaz - Bouteilles et tubes composites - Contrôles et essais périodiques

(ISO/DIS 11623:2022)
Ta slovenski standard je istoveten z: prEN ISO 11623
ICS:
23.020.35 Plinske jeklenke Gas cylinders
oSIST prEN ISO 11623:2022 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN ISO 11623:2022
---------------------- Page: 2 ----------------------
oSIST prEN ISO 11623:2022
DRAFT INTERNATIONAL STANDARD
ISO/DIS 11623.2
ISO/TC 58/SC 4 Secretariat: ANSI
Voting begins on: Voting terminates on:
2022-09-26 2022-11-21
Gas cylinders — Composite cylinders and tubes — Periodic
inspection and testing

Bouteilles à gaz — Bouteilles et tubes composites — Contrôles et essais périodiques

ICS: 23.020.35
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 11623.2:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
---------------------- Page: 3 ----------------------
oSIST prEN ISO 11623:2022
ISO/DIS 11623.2:2022(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 11623.2
ISO/TC 58/SC 4 Secretariat: ANSI
Voting begins on: Voting terminates on:
2022-06-01
Gas cylinders — Composite cylinders and tubes — Periodic
inspection and testing

Bouteilles à gaz — Bouteilles et tubes composites — Contrôles et essais périodiques

ICS: 23.020.35
This document is circulated as received from the committee secretariat.
COPYRIGHT PROTECTED DOCUMENT
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2022
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

NOT BE REFERRED TO AS AN INTERNATIONAL

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on STANDARD UNTIL PUBLISHED AS SUCH.

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

IN ADDITION TO THEIR EVALUATION AS

or ISO’s member body in the country of the requester. BEING ACCEPTABLE FOR INDUSTRIAL,

TECHNOLOGICAL, COMMERCIAL AND
ISO copyright office
USER PURPOSES, DRAFT INTERNATIONAL
CP 401 • Ch. de Blandonnet 8
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
CH-1214 Vernier, Geneva
POTENTIAL TO BECOME STANDARDS TO
Phone: +41 22 749 01 11
WHICH REFERENCE MAY BE MADE IN
Reference number
Email: copyright@iso.org
NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 11623.2:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
© ISO 2022 – All rights reserved
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
---------------------- Page: 4 ----------------------
oSIST prEN ISO 11623:2022
ISO/DIS 11623.2:2022(E)
Contents Page

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

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

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.......................................................................................................................................................................................... 5

6 Identification of cylinder and preparation for periodic inspection and testing .............................5

7 External visual inspection ........................................................................................................................................................................ 5

7.1 Preparation ................................................................................................................................................................................................ 5

7.1.1 General ........................................................................................................................................................................................ 5

7.1.2 Permanent protective attachments................................................................................................................... 6

7.1.3 Sleeves ......................................................................................................................................................................................... 6

7.1.4 Cleaning ...................................................................................................................................................................................... 6

7.2 Inspection procedures ..................................................................................................................................................................... 6

7.3 Damage .......................................................................................................................................................................................................... 7

7.3.1 General ........................................................................................................................................................................................ 7

7.3.2 Damage levels ........................................................................................................................................... ............................. 7

7.3.3 Types of external damage .......................................................................................................................................... 8

7.4 Repairs ........................................................................................................................................................................................................ 11

8 Internal visual inspection .......................................................................................................................................................................11

8.1 Translucent cylinders .................................................................................................................................................................... 11

8.2 Safe removal of valve ..................................................................................................................................................................... 11

8.3 Internal visual inspection and cleaning........................................................................................................................ 11

8.3.1 General ..................................................................................................................................................................................... 11

8.3.2 Metallic liners ........................................................................................................................................... ..........................12

8.3.3 Linerless and non-metallic liners .....................................................................................................................12

8.4 Types of internal damage ...........................................................................................................................................................12

8.4.1 Type 2 and Type 3 cylinders .................................................................................................................................12

8.4.2 Type 4 cylinders ...............................................................................................................................................................13

8.4.3 Type 5 cylinders ...............................................................................................................................................................13

8.4.4 Excess resin droplets ................................................................................................................................................... 14

8.5 Inspection of cylinder neck ...................................................................................................................................................... 14

8.6 Inspection criteria ............................................................................................................................................................................ 14

9 Pressure test .........................................................................................................................................................................................................15

10 Leak test .....................................................................................................................................................................................................................16

11 Inspection of valve ..........................................................................................................................................................................................16

12 Final operations .................................................................................................................................................................................................17

12.1 Drying and cleaning ........................................................................................................................................................................ 17

12.2 Painting ...................................................................................................................................................................................................... 17

12.3 Cylinder re-valving .......................................................................................................................................................................... 17

12.4 Check of cylinder tare ................................................................................................................................................................... 17

12.5 Retest marking .................................................................................................................................................................................... 18

12.6 Reference to next periodic inspection and test date ......................................................................................... 18

12.7 Identification of contents ........................................................................................................................................................... 18

12.8 Records ....................................................................................................................................................................................................... 18

13 Rejection and rendering cylinders unserviceable ........................................................................................................19

iii
© ISO 2022 – All rights reserved
---------------------- Page: 5 ----------------------
oSIST prEN ISO 11623:2022
ISO/DIS 11623.2:2022(E)

Annex A (informative) Intervals between periodic inspection and testing ...........................................................29

Annex B (normative) Damage criteria for steel wire wound, aluminium-alloy cylinders ......................32

Annex C (normative) Internal visual inspection of translucent cylinders...............................................................33

Annex D (informative) List of gases corrosive to steel liners and steel bosses ..................................................34

Annex E (informative) Cleaning of seamless aluminium-alloy liners or aluminium-alloy

components ............................................................................................................................................................................................................35

Annex F (informative) Periodic inspection date rings for cylinders ..............................................................................36

Bibliography .............................................................................................................................................................................................................................37

© ISO 2022 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 11623:2022
ISO/DIS 11623.2:2022(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

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

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to

the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see

www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 4,

Operational requirements for gas cylinders.

This third edition cancels and replaces the second edition (ISO 11623:2015), which has been technically

revised.
The main changes are as follows:

— revised scope to include cylinders and tubes with a water capacity up to 3 000 l;

— modification of Table 1 to separate abrasion damage based on water capacity of the cylinder;

— clarification that a transparent sleeve may be left in place during inspection (7.1.3); and

— clarification on the use of tare during inspection.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html.
© ISO 2022 – All rights reserved
---------------------- Page: 7 ----------------------
oSIST prEN ISO 11623:2022
ISO/DIS 11623.2:2022(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. It is not possible to identify all considerations for periodic inspection

and testing of composite cylinders in this document. In such cases or where there is doubt, questions

regarding specific cylinders should be directed to the manufacturer or owner.

This document is intended to be used under a variety of national regulatory regimes but has been

[1]
written so that it is suitable for the application of the UN Model Regulations .

This document also gives other requirements concerning preparation, finishing and maintenance of

composite cylinders and tubes as well as the safety precautions for the personnel performing this work.

These requirements can be mandatory under other regulations.
© ISO 2022 – All rights reserved
---------------------- Page: 8 ----------------------
oSIST prEN ISO 11623:2022
DRAFT INTERNATIONAL STANDARD ISO/DIS 11623.2:2022(E)
Gas cylinders — Composite cylinders and tubes — Periodic
inspection and testing

CAUTION — Some of the tests specified in this document involve the use of processes that could

lead to a hazardous situation.
1 Scope

This document 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 and

tubes, 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 3 000 l.

This document is written to address the periodic inspection and testing of composite cylinders and

tubes constructed to ISO 11119-1, ISO 11119-2, ISO 11119-3, ISO 11119-4 and ISO 11515 standards

and can be applied to other composite cylinders and tubes designed to comparable standards when

authorized by the competent authority.

As far as practicable, this document also can be applied to cylinders of less than 0,5 l water capacity

when authorized by the manufacturer.

NOTE Unless noted by exception, the use of the word “cylinder” in this document refers to both cylinders

and tubes.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 10286, Gas cylinders — Vocabulary

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 18119, Gas cylinders — Seamless steel and seamless aluminium-alloy gas cylinders and tubes — Periodic

inspection and testing
ISO 22434, Gas cylinders — Inspection and maintenance of valves

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 terms and definitions given in ISO 10286 and the following apply.

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp
© ISO 2022 – All rights reserved
---------------------- Page: 9 ----------------------
oSIST prEN ISO 11623:2022
ISO/DIS 11623.2:2022(E)
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
composite overwrap
combination of fibres (3.3) (including steel wire) and matrix (3.15)
3.2
external 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 external coating.

3.3
fibre
load-carrying part of the composite overwrap (3.1)
EXAMPLE Glass, aramid or carbon
3.4
type 5 cylinder

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

portion and dome ends
3.5
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
3.6
type 3 cylinder

fully wrapped cylinder with a load sharing metal liner (3.11) and composite reinforcement on both the

cylindrical portion and the dome ends
3.7
type 2 cylinder

hoop wrapped cylinder with a load-sharing metal liner (3.11) and composite reinforcement on the

cylindrical portion only
3.8
translucent cylinder
cylinder that permits the passage of light
3.9
identification label

label containing the permanent markings required by the relevant design specification

3.10
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
3.11
liner

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

both to contain the gas and transmit the gas pressure to the composite overwrap (3.1)

3.12
non-metallic liner
liner (3.11) made from thermoplastic, thermosetting, or elastomeric material
© ISO 2022 – All rights reserved
---------------------- Page: 10 ----------------------
oSIST prEN ISO 11623:2022
ISO/DIS 11623.2:2022(E)
3.13
sleeve

transparent or non-transparent cover fitted to the outside surface of the cylinder

3.14
repair

set of activities performed on defective pressure equipment to restore its compliance with the relevant

specification

Note 1 to entry: Repair can include replacing worn or damaged parts meeting the original specification

3.15
matrix
material that is used to bind and hold the fibres (3.3) in place
Note 1 to entry: The matrix is sometimes called resin.
3.16
rejected cylinder

cylinder not fit for service or which needs to be set aside for further evaluation or testing in its present

condition
3.17
bulge
visible swelling of the wall

Note 1 to entry: A bulge is away from the centreline (convex) and a dent is towards this centreline (concave).

3.18
crack

split or separation in the material, typically appearing as a line on the surface

3.19
crease

off-colour linear or non-linear feature formed as a result of previous localized over-stressing

3.20
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.
3.21
permanent protective attachment

integral part of the cylinder design permanently affixed to composite cylinders (Types 2 to 5) covering

part of or the entire surface of the cylinder, providing additional functions during handling, transport

and use
3.22
stoving
treat by heating (e.g. in an oven) in order to apply a desired surface coating
© ISO 2022 – All rights reserved
---------------------- Page: 11 ----------------------
oSIST prEN ISO 11623:2022
ISO/DIS 11623.2:2022(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 following the

expiry of the interval established in accordance with the requirements of national or international

[1]

regulations or, in the absence of regulations, in accordance with the UN Model Regulations .

NOTE Annex A provides guidance regarding the intervals between periodic inspection and testing.

The expiry date is based on the last test date shown on the cylinder. Other means of indicating the

expiry date are permitted.

Provided the cylinder has not been subjected to abusive and abnormal conditions such as being

involved in an accident, heat exposure or other severe conditions that would render it unsafe, there is

no requirement for the user to return a cylinder before the contents have been used even though the

periodic inspection and testing 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 competent persons

in suitable facilities for cylinders of the size and type being requalified. Care shall be taken to ensure

that during the retest procedure, cylinders are handled carefully, particularly with respect to loading.

When moving from handling pallets or other transport frames, processes shall be developed to ensure

cylinders are not dropped or impacted during movement. Special handling methods and tooling may be

required to safely handle cylinders.
Handling procedures shall be available at the authorized inspection site.

Tests and examinations performed to demonstrate compliance shall be conducted using instruments

calibrated before being put into service and thereafter according to an established programme.

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 document in

the noted clauses:

— 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 visual 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).
© ISO 2022 – All rights reserved
---------------------- Page: 12 ----------------------
oSIST prEN ISO 11623:2022
ISO/DIS 11623.2:2022(E)

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; for the safe removal of a valve, the requirements in ISO 25760 shall be met.

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.

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 manufacturer confirms (i.e. either

on a cylinder label or through documentation) that the allowable temperature is greater than 70 °C,

then the manufacturer’s recommendations shall be followed during refurbishment.

6 Identification of cylinder and preparation for periodic inspection and testing

Before any work is carried out, the relevant cylinder marks (e.g. see ISO 13769) and the gas contents

(e.g. see ISO 7225) shall be identified. First, the marking shall be checked t
...

SLOVENSKI STANDARD
oSIST prEN ISO 11623:2022
01-maj-2022
Plinske jeklenke - Jeklenke in velike jeklenke iz kompozitnih materialov -
Periodični pregledi in preskusi (ISO/DIS 11623:2022)

Gas cylinders - Composite cylinders and tubes - Periodic inspection and testing (ISO/DIS

11623:2022)
Gasflaschen – Verbundbauweise (Composite-Bauweise) – Wiederkehrende Inspektion
und Prüfung (ISO/DIS 11623:2022)

Bouteilles à gaz - Bouteilles et tubes composites - Contrôles et essais périodiques

(ISO/DIS 11623:2022)
Ta slovenski standard je istoveten z: prEN ISO 11623
ICS:
23.020.35 Plinske jeklenke Gas cylinders
oSIST prEN ISO 11623:2022 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN ISO 11623:2022
---------------------- Page: 2 ----------------------
oSIST prEN ISO 11623:2022
DRAFT INTERNATIONAL STANDARD
ISO/DIS 11623
ISO/TC 58/SC 4 Secretariat: ANSI
Voting begins on: Voting terminates on:
2022-03-09 2022-06-01
Gas cylinders — Composite cylinders and tubes — Periodic
inspection and testing

Bouteilles à gaz — Bouteilles et tubes composites — Contrôles et essais périodiques

ICS: 23.020.35
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 11623:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
---------------------- Page: 3 ----------------------
oSIST prEN ISO 11623:2022
ISO/DIS 11623:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2022 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 11623:2022
ISO/DIS 11623:2022(E)
Contents Page

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

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

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

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

3 Terms and definitions .................................................................................................................................................................................... 1

4 Due dates for periodic inspection and testing ..................................................................................................................... 3

5 Procedures for periodic inspection and testing ................................................................................................................ 4

5.1 List of procedures ................................................................................................................................................................................ 4

5.2 Heat exposure.......................................................................................................................................................................................... 5

6 Identification of cylinder and preparation for periodic inspection and testing .............................5

7 External visual inspection ........................................................................................................................................................................ 5

7.1 Preparation ................................................................................................................................................................................................ 5

7.1.1 General ........................................................................................................................................................................................ 5

7.1.2 Permanent protective attachments................................................................................................................... 8

7.1.3 Sleeves ......................................................................................................................................................................................... 8

7.1.4 Cleaning ...................................................................................................................................................................................... 8

7.2 Inspection procedures ..................................................................................................................................................................... 9

7.3 Damage .......................................................................................................................................................................................................... 9

7.3.1 General ........................................................................................................................................................................................ 9

7.3.2 Damage levels ...................................................................... .................................................................................................. 9

7.3.3 Types of external damage ....................................................................................................................................... 10

7.4 Repairs ........................................................................................................................................................................................................ 11

8 Internal visual inspection .......................................................................................................................................................................11

8.1 Safe removal of valve ..................................................................................................................................................................... 11

8.2 Internal inspection and cleaning ........................................................................................................................................ 11

8.2.1 General ..................................................................................................................................................................................... 11

8.2.2 Metallic liners ..................................................................................................................................................................... 11

8.2.3 Linerless and non-metallic liners .....................................................................................................................12

8.3 Types of internal damage ........................................................................................................................................................... 12

8.3.1 Bulge outward ................................................................................................................................................................... 12

8.3.2 Inward bulging liner (Type 4 cylinders with non-metallic liners) .....................................12

8.3.3 Dented liner (Types 2 and 3 cylinders) .......................................................................................................12

8.3.4 Blistered liners ..................................................................................................................................................................12

8.3.5 Cracking ..................................................................................................................................................................................12

8.3.6 Indications of chemical attack ............................................................................................................................. 13

8.3.7 Indications of melting ................................................................................................................................................. 13

8.3.8 Discoloured interior .....................................................................................................................................................13

8.3.9 Composite matrix (Type 5 cylinders) shows deterioration and/or loose

fibres ..........................................................................................................................................................................................13

8.3.10 Crease ........................................................................................................................................................................................ 13

8.3.11 Excess resin droplets (Type 5 cylinders)................................................................................................... 13

8.4 Inspection of cylinder neck ...................................................................................................................................................... 13

8.5 Inspection criteria ............................................................................................................................................................................ 13

9 Pressure test .........................................................................................................................................................................................................14

10 Leak test .....................................................................................................................................................................................................................15

11 Inspection of valve ..........................................................................................................................................................................................16

12 Final operations .................................................................................................................................................................................................16

12.1 Drying and cleaning ........................................................................................................................................................................ 16

12.2 Painting ...................................................................................................................................................................................................... 16

iii
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oSIST prEN ISO 11623:2022
ISO/DIS 11623:2022(E)

12.3 Cylinder re-valving .......................................................................................................................................................................... 16

12.4 Check of cylinder tare ................................................................................................................................................................... 16

12.5 Retest marking .................................................................................................................................................................................... 17

12.6 Reference to next periodic inspection and test date ......................................................................................... 17

12.7 Identification of contents ........................................................................................................................................................... 17

12.8 Records ....................................................................................................................................................................................................... 18

13 Rejection and rendering cylinders unserviceable ........................................................................................................18

Annex A (informative) Intervals between periodic inspection and testing ...........................................................25

Annex B (normative) Damage criteria for steel wire wound, aluminium-alloy cylinders ......................28

Annex C (normative) Internal inspection of translucent cylinders .................................................................................29

Annex D (informative) List of gases corrosive to steel liners and steel bosses ..................................................30

Annex E (informative) Cleaning of seamless aluminium-alloy liners ...........................................................................31

Annex F (informative) Test date rings for cylinders ........................................................................................................................32

Bibliography .............................................................................................................................................................................................................................33

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oSIST prEN ISO 11623:2022
ISO/DIS 11623:2022(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

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

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to

the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see

www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 4,

Operational requirements for gas cylinders.

This third edition cancels and replaces the second edition (ISO 11623:2015), which has been technically

revised.
The main changes compared to the previous edition are as follows:

— revised scope to include cylinders and tubes with a water capacity up to 3 000 l;

— modification of Table 1 to separate abrasion damage based on water capacity of the cylinder;

— clarification that a transparent sleeve may be left in place during inspection (7.1.3); and

— clarification on the use of tare during inspection.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html.
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oSIST prEN ISO 11623:2022
ISO/DIS 11623:2022(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. It is not possible to identify all considerations for periodic inspection

and testing of composite cylinders in this document. In such cases or where there is doubt, questions

regarding specific cylinders should be directed to the manufacturer or owner.

This document is intended to be used under a variety of national regulatory regimes but has been

[1]
written so that it is suitable for the application of the UN Model Regulations .

This document also gives other requirements concerning preparation, finishing and maintenance of

composite cylinders and tubes as well as the safety precautions for the personnel performing this work.

These requirements can be mandatory under other regulations.
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oSIST prEN ISO 11623:2022
DRAFT INTERNATIONAL STANDARD ISO/DIS 11623:2022(E)
Gas cylinders — Composite cylinders and tubes — Periodic
inspection and testing

CAUTION — Some of the tests specified in this document involve the use of processes that could

lead to a hazardous situation.
1 Scope

This document 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 and

tubes, 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 3 000 l.

This document is written to address the periodic inspection and testing of composite cylinders and

tubes constructed to ISO 11119-1, ISO 11119-2, ISO 11119-3, ISO 11119-4 and ISO 11515 standards

and can be applied to other composite cylinders and tubes designed to comparable standards when

authorized by the competent authority.

As far as practicable, this document also can be applied to cylinders of less than 0,5 l water capacity

when authorized by the manufacturer.

NOTE Unless noted by exception, the use of the word “cylinder” in this document refers to both cylinders

and tubes.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 10286, Gas cylinders — Vocabulary

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 18119, Gas cylinders — Seamless steel and seamless aluminium-alloy gas cylinders and tubes — Periodic

inspection and testing
ISO 13341, Gas cylinders — Fitting of valves to gas cylinders
ISO 13769, Gas cylinders — Stamp marking

ISO 22434, Transportable gas cylinders — Inspection and maintenance of cylinder valves

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 terms and definitions given in ISO 10286 and the following apply.

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp
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oSIST prEN ISO 11623:2022
ISO/DIS 11623:2022(E)
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
composite overwrap
fibres (3.3) and matrix (3.15) taken together as a combined unit
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
Type 5 cylinder

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

portion and dome ends
3.5
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
3.6
Type 3 cylinder

fully wrapped cylinder with a load sharing metal liner (3.11) and composite reinforcement on both the

cylindrical portion and the dome ends
3.7
Type 2 cylinder

hoop wrapped cylinder with a load-sharing metal liner (3.11) and composite reinforcement on the

cylindrical portion only
3.8
translucent cylinder
cylinder that permits the passage of light
3.9
identification label

label containing the permanent markings required by the relevant design specification

3.10
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
3.11
liner

inner portion of the composite cylinder designed both to contain the gas and transmit the gas pressure

to the composite overwrap (3.1)
3.12
non-metallic liner
liner (3.11) made from thermoplastic, thermosetting, or elastomeric material
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oSIST prEN ISO 11623:2022
ISO/DIS 11623:2022(E)
3.13
sleeve

transparent or non-transparent cover fitted to the outside surface of the cylinder

3.14
repair
minor refurbishment to return the cylinder to its acceptable condition
EXAMPLE Adding resin.
3.15
matrix
material used to bind and hold the fibres (3.3) in place
Note 1 to entry: The matrix is sometimes called resin.
3.16
rejected cylinder

cylinder not fit for service or which needs to be set aside for further evaluation or testing in its present

condition
3.17
bulge
visible swelling of the wall
3.18
crack

split or separation in the material, typically appearing as a line on the surface

3.19
crease

off-colour linear or non-linear feature formed as a result of previous localized over-stressing

3.20
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.
3.21
permanent protective attachment

integral part of the cylinder design permanently affixed to composite cylinders (Types 2 to 5) covering

part of or the entire surface of the cylinder, providing additional functions during handling, transport

and use
3.22
stoving
treat by heating (e.g. in an oven) in order to apply a desired surface coating
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 following the

expiry of the interval established in accordance with the requirements of national or international

regulations or, in the absence of regulations, in accordance with the UN Model Regulations [1].

NOTE Annex A provides guidance regarding the intervals between periodic inspection and testing.

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oSIST prEN ISO 11623:2022
ISO/DIS 11623:2022(E)

The expiry date is based on the last test date shown on the cylinder. Other means of indicating the

expiry date are permitted.

Provided the cylinder has not been subjected to abusive and abnormal conditions such as being

involved in an accident, heat exposure or other severe conditions that would render it unsafe, there is

no requirement for the user to return a cylinder before the contents have been used even though the

periodic inspection and testing 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 competent persons

in suitable facilities for cylinders of the size and type being requalified. Care shall be taken to ensure

that during the retest procedure, cylinders are handled carefully, particularly with respect to loading.

When moving from handling pallets or other transport frames, processes shall be developed to ensure

cylinders are not dropped or impacted during movement. Special handling methods and tooling may be

required to safely handle cylinders.
Handling procedures shall be available at the authorized inspection site.

Tests and examinations performed to demonstrate compliance shall be conducted using instruments

calibrated before being put into service and thereafter according to an established programme.

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 document in

the noted Clauses:

— 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 has to be removed, the requirements in ISO 25760 shall be followed.

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).
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oSIST prEN ISO 11623:2022
ISO/DIS 11623:2022(E)
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.

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 manufacturer confirms (i.e. either

on a cylinder label or through documentation) that the allowable temperature is greater than 70 °C,

then the manufacturer’s recommendations shall be followed during refurbishment.

6 Identification of cylinder and preparation for periodic inspection and testing

Before any work is carried out, the relevant cylinder marks (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. For

Type 4 and Type 5 cylinders, take necessary precautions and/or consult the cylinder manufacturer for

depressurization procedures to avoi
...

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