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International
Standard
ISO 20560-1
Second edition
Safety information for the content
2024-06
of piping systems and tanks —
Part 1:
Piping systems
Informations de sécurité relatives au contenu des systèmes de
tuyauteries et des reservoirs —
Partie 1: Systèmes de tuyauteries
Reference number
© ISO 2024
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Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General requirements . 2
5 Elements of safety information systems for piping . 3
5.1 General .3
5.2 Colour coding to identify the nature of the content in the piping .3
5.3 Content name .5
5.4 Flow direction indicators .6
5.5 Warning signs and GHS pictograms .6
6 Technical and operational information . 7
6.1 General .7
6.2 Additional safety information .8
6.3 Additional technical information . .8
6.4 Supplementary identification colours .8
7 Layout requirements . 9
8 Installation of safety information systems for piping .10
9 Maintenance, inspection and revision . .11
Annex A (informative) Standard colours and equivalent colour codes .12
Annex B (informative) Observation distance .13
Annex C (informative) Examples of safety information systems . 17
Annex D (informative) Firefighting systems .22
Annex E (informative) Maritime piping systems .23
Bibliography .25
iii
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 145, Graphical symbols, Subcommittee SC 2,
Safety identification, signs, shapes, symbols and colours.
This second edition cancels and replaces the first edition (ISO 20560-1:2020), which has been technically
revised.
The main changes are as follows:
— the colour values for yellow in Table 2 have been modified;
— the colour values for maroon and yellow in Table 5 have been modified;
— the colour values in Table A.1 have been modified.
A list of all parts in the ISO 20560 series can be found on the ISO website.
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.
iv
Introduction
Continuous growth in mobility of labour has resulted in a need to standardize safety information and form a
coherent system for non-verbal exchange of information that consists of distinct elements to identify hazards
related to the content of piping systems and tanks. Every element of the safety information system defined
in this document communicates specific information. When combined on a pipe marking, these elements
inform the viewer, in a unique and simplified way, of potential hazards so that accidents can be prevented
and an appropriate response to emergency situations can be efficiently accomplished.
The use of this document is expected to reduce risk by providing a means of improved training and
education to reduce possible confusion for people working with and near piping systems in both normal and
emergency situations.
The use of a standardized safety information system does not replace proper work methods, instructions or
accident prevention training and measures. Education is an essential part of any system that provides safety
information.
The national pipe marking standards of many different countries were reviewed during the development
of this document. Important design concepts contained in these standards were incorporated into this
document.
NOTE The statutory regulations of some countries can differ in some respect from the requirements given in this
document.
v
International Standard ISO 20560-1:2024(en)
Safety information for the content of piping systems and tanks —
Part 1:
Piping systems
IMPORTANT — The colours represented in the electronic file of this document can be neither viewed
on screen nor printed as true representations. For the purposes of colour matching, see Table 2
and Table 5, which provide colorimetric and photometric properties, and Annex A, which provides
references from colour order systems.
1 Scope
This document specifies safety information for overground piping systems related to the content of the
piping system and associated hazards for the purposes of accident prevention, reducing risks to health and
providing information for use in case of an emergency.
This document does not cover piping that is buried.
Safety signing of the hazards in an area is not part of this document.
This document does not cover risk assessment.
This document can also be used for marine structures and ships.
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 7010, Graphical symbols — Safety colours and safety signs — Registered safety signs
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
additional safety information
information typically presented in the form of text, numbers or both to indicate details related to the safety
information system (3.8)
EXAMPLE Pressure or temperature.
3.2
additional technical information
technical information that is additional to the safety information system (3.8) to indicate technical details
EXAMPLE Pipe identification codes or from–to information.
3.3
basic identification colour
colour used to indicate a group of similar media
3.4
content of the pipe
medium which is transported in the pipe
EXAMPLE Gasses, liquids or solids as powder or granulate.
3.5
flow direction indicator
arrow to indicate the flow direction of the content of the pipe (3.4)
3.6
GHS hazard pictogram
graphical composition defined by the Globally harmonized system of classification and labelling of chemicals
(GHS) that can include a symbol plus other graphic elements, such as a border, background pattern or colour,
intended to convey specific information as given by the GHS
3.7
safety data sheet
SDS
standardized information template for a medium which identifies the medium and contains information
about its potential health, physical and chemical hazards, and emergency and firefighting procedures
3.8
safety information system
series of markings that consistently uses standardized elements to visually communicate information
necessary for the reliable recognition, identification and understanding of hazards
3.9
supplementary identification colour
colour used in combination with the basic identification colour (3.3) to indicate a specific purpose
3.10
warning sign
safety sign that indicates a specific source of potential harm
[SOURCE: ISO 3864-1:2011, 3.16]
4 General requirements
A safety information system for piping visually communicates information necessary for the reliable
recognition, identification and understanding of any hazard related to the type and character of the content
of a pipe. This safety information system shall be installed on site and near any place that potentially
requires
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