ISO/FDIS 32
(Main)Gas cylinders — Colour coding
Gas cylinders — Colour coding
ISO 32:2005 specifies a colour coding system for the secondary method of identification of the contents of industrial and medical gas cylinders with particular reference to the property of the gas or gas mixture. Cylinder labels are the primary method of indicating cylinder contents. ISO 32:2005 does not apply to cylinders containing liquefied petroleum gases (LPG) or to fire extinguishers.
Bouteilles à gaz — Code couleur
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Standards Content (Sample)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 32
ISO/TC 58/SC 4
Gas cylinders — Colour coding
Secretariat: ANSI
Voting begins on:
Bouteilles à gaz — Code couleur
2005-10-13
Voting terminates on:
2005-12-13
Please see the administrative notes on page iii
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BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 32:2005(E)
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©
NATIONAL REGULATIONS. ISO 2005
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ISO/FDIS 32:2005(E)
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ii © ISO 2005 – All rights reserved
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ISO/FDIS 32:2005(E)
In accordance with the provisions of Council Resolution 15/1993, this document is circulated in the
English language only.
© ISO 2005 – All rights reserved iii
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ISO/FDIS 32:2005(E)
Contents Page
Foreword. v
Introduction . vi
1 Scope. 1
2 Normative references . 1
3 Principles . 1
4 Colour coding system . 1
4.1 General . 1
4.2 Gas properties. 2
4.3 Specific gases . 2
4.4 Mixtures of inert gases . 2
4.5 Gas mixtures used for inhalation . 3
5 Implementation. 3
Annex A (normative) Colour references . 4
Annex B (informative) Guidance for the selection of colours. 5
Annex C (normative) Colour location.8
Annex D (normative) Letter “N” . 9
Bibliography . 10
iv © ISO 2005 – All rights reserved
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ISO/FDIS 32:2005(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
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 document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 32 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 4, Operational
requirements for gas cylinders.
This second edition cancels and replaces the first edition (ISO 32:1977), which has been technically revised.
The scope has been widened to include cylinders in other than medical applications in an effort for
international harmonization to provide a means of hazard identification.
© ISO 2005 – All rights reserved v
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ISO/FDIS 32:2005(E)
Introduction
Cylinder labels are the primary method of indicating cylinder contents. However, colour coding is used to
identify the contents of gas cylinders from a distance. It is recognized that other systems are in use and may
be used in conjunction with the requirements of this International Standard.
This document, along with ISO 13769 and ISO 7225, belongs to a series of International Standards specifying
gas cylinder identification requirements.
vi © ISO 2005 – All rights reserved
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 32:2005(E)
Gas cylinders — Colour coding
1 Scope
This International Standard specifies a colour coding system for the secondary method of identification of the
contents of industrial and medical gas cylinders with particular reference to the property of the gas or gas
mixture. Cylinder labels are the primary method of indicating cylinder contents.
This International Standard does not apply to cylinders containing liquefied petroleum gases (LPG) or to fire
extinguishers.
NOTE LPG includes substances carried under the UN number 1965 “Hydrocarbon gas mixture, liquefied, N.O.S.”
2 Normative references
The following referenced documents are indispensable for the application 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 10156 (all parts), Gas cylinders — Gases and gas mixtures
ISO 10298:1995, Determination of toxicity of a gas or gas mixture
ISO 13338:1995, Determination of tissue corrosiveness of a gas or gas mixture
3 Principles
Colour coding is used to identify the contents of gas cylinders from a distance. Colour coding also may be
used for sorting purposes.
Identification colours shall be applied to cylinder shoulders. The cylinder body and valve protection device
may be coloured for other purposes, however. The use of a colour for the cylinder body that allows
misinterpretation of the hazard should be avoided.
Colours used shall be in accordance with RAL register 840HR given in Annex A or equivalent.
4 Colour coding system
4.1 General
Gas cylinders are assigned colours using three methods. Colours are chosen based on the property of
...
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