ForewordISO (the International Orga

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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 11623 was prepared by the European Committee for Standardization (CEN) in collaboration with Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 4, Operational requirements for gas cylinders, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
Throughout the text of this document, read "…this European Standard…" to mean "…this International Standard…".
Annexes B and ZA form a normative part of this International Standard. Annexes A, C and D are for information only.
Annex ZA provides a list of corresponding International and European Standards for which equivalents are not given in the text.
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Contents

Page
Foreword v
Introduction 1
1 Scope 1
2 Normative references 1
3 Terms and definitions 2
4 Intervals between periodic inspection and testing 3
5 Procedures for periodic inspection and test 6
6 Identification of cylinder and preparation for inspection and test 7
7 External visual inspection 7
8 Internal visual inspection 11
9 Permeability testing 12
10 Pressure test 12
11 Inspection of value 12
12 Final operations 13
13 Rejection and rendering cylinders unserviceable 14
Annex A (informative) Example of procedure to be adopted when a cylinder valve is suspected of being obstructed 24
Annex B (normative) Damage criteria for wire wound aluminium alloy cylinders 27
Annex C (informative) Volumetric expansion testing of gas cylinders 28
Annex D (informative) Inspection and maintenance of valves – Recommended procedures 36
Annex ZA (normative) Corresponding International and European Standards for which equivalents are not given in the text 37v
Foreword

This document (EN ISO 11623:2002) has been prepared by Technical Committee CEN/TC 23 "Transportable gas cylinders" the secretariat of which is held by BSI, in collaboration with Technical Committee ISO/TC 58 "Gas cylinders".
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 September 2002, and conflicting national standards shall be withdrawn at the latest by September 2002.
This European Standard has been submitted for reference into the RID and/or in the technical annexes of the ADR. Therefore in this context the standards listed in the normative references and covering basic requirements of the RID/ADR not addressed within the present standard are normative only when the standards themselves are referred to in the RID and/or in the technical annexes of the ADR.
Annexes A, C and D are informative.
Annexes B and ZA are normative.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
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Introduction

The principal aim of periodic inspection and testing is that at the completion of the test the cylinders may be reintroduced into service for a further period of time. It is not possible to identify all considerations for inspecting and re-testing of composite cylinders in this publication. Questions regarding specific cylinders should be directed to the manufacturer.
1 Scope

This standard specifies the requirements for periodic inspection and testing of hoop wrapped and fully wrapped composite transportable gas cylinders, with aluminium, steel or non-metallic liners or of lineless construction, intended for compressed, liquefied or dissolved gases under pressure, of water capacity from 0,5 l up to 450 l.
NOTE As far as practicable, this standard may also be applied to cylinders of less than 0,5 l water capacity.
This standard specifies the requirements for periodic inspection and testing to verify the integrity of such gas cylinders for further service.
2 Normative references

This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments).
EN 629–2:1996, Transportable gas cylinders – 26E taper thread for connection of valves to gas cylinders — Part 2: Gauge inspection
EN 1089–1, Transportable gas Cylinders — Gas cylinder identification (excluding LPG) — Part 1: Stampmarking
EN 1089–2, Transportable gas cylinders — Gas cylinder Identification (excluding LPG) — Part 2: Precautionary labels
EN 1089–3, Transportable gas cylinders — Gas cylinder identification — Part 3: Colour coding
EN 1795, Transportable gas cylinders (excluding LPG) — Procedures for change of gas service
prEN 1802, Transportable Gas cylinders — Periodic inspection and testing of seamless aluminium alloy gas cylinders
prEN 1968, Transportable gas cylinders — Periodic inspection and testing of seamless steel gas cylinders
prEN 13096, Transportable gas cylinders — Filling conditions for single gases
ISO 32:1977, Gas cylinders for medical use — Marking for identification of content
ISO 6406: 1992, Periodic inspection and testing of seamless steel gas cylinders
ISO 7225:1994, Gas cylinders — Precautionary labels
ISO 10461: 1993, Seamless aluminium-alloy gas cylinders; periodic inspection and testing
ISO 11114-1:1997, Transportable gas cylinders — Compatibility of cylinder and value materials with gas contents — Part 1: Metallic materials
1
ISO 11114-2:1997, Transportable gas cylinders — Compatibility of cylinder and value materials with gas contents — Part 2: Non-metallic materials
ISO 11191:1997, Gas cylinders — 25E taper thread for connection of valves to gas cylinders — inspection gauges
ISO 11621: 1997, Gas cylinders — Procedures for change of gas service
ISO 13341:1997, Transportable gas cylinder — Fitting of valves to gas cylinders
ISO 10298, Determination of toxicity of a gas or gas mixture
ISO 13769, Gas cylinders — Stamp marking
3 Terms and definitions

For the purpose of this European standard, the following terms and definitions apply.
3.1
burst pressure

maximum pressure attained during a burst test
3.2
composite overwrap

fibres and matrix taken together as a combined unit
3.3
exterior coating

layer of material applied to the cylinder as a protective coating or for cosmetic purposes
NOTE Not all composite cylinders will have a special exterior coating.
3.4
fibre

load-carrying part of the composite overwrap e.g. glass, aramid and carbon
3.5
fully wrapped composite cylinder without liner

cylinder manufactured only from continuous fibre strands in a resin matrix wrapped in both circumferential and longitudinal directions
3.6
fully wrapped composite cylinder with liner

steel, aluminium alloy or non-metallic liner wrapped with continous fibre stands in a resin matrix both circumferentially and longitudinally
3.7
hoop wrapped composite cylinder

seamless steel or aluminium alloy liner wrapped with continuous fibre strands or steel wire around only the cylindrical body of the liner, leaving the metal in the neck and base regions exposed. The fibre strands are embedded in a resin matrix
3.8
identification label

label containing the permanent markings required by the relevant design document and EN 1089-1 or ISO 13769
3.9
LC50

50 % lethal concentration, as defined in ISO 10298
2
3.10
lifetime

service life of the cylinder, if specified on the design drawing
3.11
liner

inner portion of the composite cylinder designed both to contain the gas and transmit the gas pressure to the composite overwrap. For hoop wrapped cylinders this provides a substantial structural strength.
3.12
non-metallic liner

liner made from thermoplastic, thermosetting, or elastomer material
3.13
protective sleeve

removable transparent or non-transparent sleeve fitted to the outside surface of the cylinder
3.14
repair

minor refurbishment performed by competent persons under controlled conditions as described in 7.4, e.g. repair of resin matrix
3.15
resin matrix

material which is used to bind and hold the fibres in place. It is usually a thermoplastic or thermosetting resin
3.16
rejected cylinder

cylinder not fit for service in its present condition
3.17
toxic gases

when LC50 > 200 p.p.m. V/V but ≤ 5 000 p.p.m. V/V, in accordance with ISO 10298
3.18
very toxic gases

when LC50 ≤ 200 p.p.m. V/V, in accordance with ISO 10298
4 Intervals between per