Safety information for the content of piping systems and tanks

This document specifies safety information for overground piping systems related to the content of the piping system and associated hazards for the purpose 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 can also be used for marine structures and ships.

Informations de sécurité relatives au contenu des systèmes de tuyauteries et des reservoirs

General Information

Status
Published
Publication Date
23-Sep-2020
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
29-Jul-2020
Completion Date
28-Jul-2020
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INTERNATIONAL ISO
STANDARD 20560-1
First edition
2020-09
Safety information for the content 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 20560-1:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 20560-1:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 20560-1:2020(E)
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 ...................................................................................................................................... 7

6 Technical and operational information ........................................................................................................................................ 8

6.1 General ........................................................................................................................................................................................................... 8

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 ..............................................................................................................................................23

Annex E (informative) Maritime piping systems ..................................................................................................................................24

Bibliography .............................................................................................................................................................................................................................26

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 20560-1:2020(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 145, Graphical symbols, Subcommittee SC

2, Safety identification, signs, shapes, symbols and colours.
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 © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 20560-1:2020(E)
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 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.

Many different countries’ national pipe marking standards were reviewed during the development of

this document. Important design concepts contained in these standards were incorporated into this

document.

NOTE Some countries’ statutory regulations could differ in some respect from the requirements given in

this document.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 20560-1:2020(E)
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 purpose 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 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

UNITED NATIONS, Globally harmonized system of classification and labelling of chemicals (GHS), eighth

revised edition, New York and Geneva, 2019, United Nations [viewed 18 May 2020]. Available from:

http:// www .unece .org/ fileadmin/ DAM/ trans/ danger/ publi/ ghs/ ghs _rev08/ ST -SG -AC10 -30 -Rev8e .pdf

3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
— IEC Electropedia: available at http:// 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.
© ISO 2020 – All rights reserved 1
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ISO 20560-1:2020(E)
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
3.6
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 might

require operation, maintenance or manipulation of a pipe’s contents.

This safety information system provides critical information that serves to assist in:

— the correct operation and use of the piping system;
— the safe maintenance of the piping system;
— conveying critical information to trained personnel in emergency situations.
2 © ISO 2020 – All rights reserved
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ISO 20560-1:2020(E)

The safety information system shall, in a comprehensive and uniform manner, accurately identify

the contents and hazards associated with the content of all piping and material transport systems in

conformity with the contents’ safety data sheets (SDSs). In some cases the safety information system

shall provide, in an integrated, coherent visual manner, specific hazard information related to the pipe

contents. Examples of this information include the exact nature of the substance, temperature, toxicity,

and the risk of asphyxiation if a release of the pipe contents occurs.

The safety information system shall consistently use multiple visual elements to accurately convey

its information, including colours and colour combinations as a coding system, text, safety signs, GHS

hazard pictograms and arrows. The information conveyed by the safety information system shall be

consistent with the organization’s risk assessment and its operation and safety plans.

All elements of a safety information system shall be distinguishable and contrasting from any

neighbouring information and shall be visible from the observation distance intended for safe operation,

intervention or manipulation. When the contents of pipes include hazardous substances (see GHS), the

safety information system shall include distinctive, unambiguous elements and the corresponding

warning signs, GHS hazard pictograms or both.

To avoid confusion, the same safety information system elements shall be consistently used and

installed throughout an organization’s piping system, whether it is a single unit, multiple units on the

same site or a multi-plant operation.
5 Elements of safety information systems for piping
5.1 General

The level of detail required to be displayed in a safety information system for piping will depend on

many factors, such as the type of plant, the complexity of the operation, the availability of check lists

and manuals and the competence and skills of operators. Organizations shall design safety information

systems for piping in accordance with their operational and risk communication needs as identified by

their risk assessment process.
A safety information system for piping shall consist of four key elements:
1) colour coding to identify the nature of the content in the piping;
2) content name;
3) flow direction indicators;
4) when applicable, warning signs, GHS pictograms or both.
5.2 Colour coding to identify the nature of the content in the piping

Safety information systems for piping shall incorporate colour coding that uses the basic identification

colours and the safety colour yellow for hazardous substances.

Where there is no need to further differentiate hazardous substances, the safety colour yellow shall be

used alone, without the addition of a basic identification colour. See Table 1.
© ISO 2020 – All rights reserved 3
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ISO 20560-1:2020(E)
Table 1 — Safety colour and basic identification colours
Content of a pipe Colour
Safety colour Hazardous substances Yellow
Basic Gases in either gaseous or Grey
identification liquefied condition
colour
Liquids and fixed materials Black
(powder, granulates)
Acids Orange
Alkalis (leaches) Violet
Firefighting medium Red
Water Green
Air Blue

The chromaticity coordinates of a basic identification colour shall fall within the relevant colour region

specified in Table 2. The luminance factor for each colour shall be as specified in Table 2. To measure

the chromaticity coordinates and luminance factor of pipe markings, the test method for ordinary

materials specified in ISO 3864-4:2011, 5.2.1 can be used. The testing shall be carried out on finished

markings or samples that are representative, with regard to the colour and surface texture, of the

material used in the finished marking.
Table 2 — Colour regions for safety colour and basic identification colours:

chromaticity coordinates and luminance factor for colours externally illuminated by CIE

standard illuminant D65
Corner points of colour region
Luminance factor
CIE standard illuminant D65
Colour
CIE 2° standard colorimetric observer
1 2 3 4 Minimum Maximum
Yellow x 0,467 0,514 5 0,470 0,432 0,45 0,60
y 0,516 0,472 5 0,440 0,478
Grey x 0,350 0,300 0,290 0,340 0,15 0,50
y 0,360 0,310 0,320 0,370
NOTE 1 Measurement geometry 45°/0° or 0°/45°.

NOTE 2 All colours except yellow and red are amended from ISO 14726. Yellow and red are safety sign colours from

ISO 3864-4.
4 © ISO 2020 – All rights reserved
---------------------- Page: 9 ----------------------
ISO 20560-1:2020(E)
Table 2 (continued)
Corner points of colour region
Luminance factor
CIE standard illuminant D65
Colour
CIE 2° standard colorimetric observer
1 2 3 4 Minimum Maximum
Black x 0,385 0,300 0,260 0,345 0,03
y 0,355 0,270 0,310 0,395
Orange x 0,590 0,538 0,508 0.550 0,25 0,4
y 0,394 0,382 0,412 0,430
Violet x 0,320 0,319 0,329 0,340 0,1 0,2
y 0,218 0,272 0,295 0,230
Red x 0,705 0,592 0,574 0,663 0,07 0,2
y 0,295 0,291 0,351 0,337
Green x 0,250 0,330 0,330 0,287 0,25 0,35
y 0,580 0,580 0,458 0,439
Blue x 0,160 0,196 0,218 0,205 0,15 0,25
y 0,225 0,250 0,192 0,169
NOTE 1 Measurement geometry 45°/0° or 0°/45°.

NOTE 2 All colours except yellow and red are amended from ISO 14726. Yellow and red are safety sign colours from

ISO 3864-4.
NOTE Examples of identification colours are given in Annex A.
5.3 Content name

The pipe’s content name shall be displayed in text elements which can be either the content name or its

chemical formula, or by numbers in accordance with national standards.

Longer words may be abbreviated using standard approved abbreviations known by operators as found

in the organization’s operation safety manuals.

The content name shall be centred and placed within the basic identification colour or in the yellow

safety colour using the contrast colours as defined in Table 3. Alternatively, the content name shall be

the contrast colour black on a white background.

Table 3 — Contrast colours for content name to be displayed on the safety colour and

basic identification colours
Content of a pipe Basic Contrast
identification colour
colour
Safety colour Hazardous substances Yellow Black
Basic Gases in either gaseous or Grey Black
identification liquefied condition
colour
Liquids and fixed materials Black White
(powder, granulates)
Acids Orange Black
Alkalis (leaches) Violet White
© ISO 2020 – All rights reserved 5
---------------------- Page: 10 ----------------------
ISO 20560-1:2020(E)
Table 3 (continued)
Content of a pipe Basic Contrast
identification colour
colour
Firefighting medium Red White
Water Green White
Air Blue White
NOTE Further information on colour systems is given in Annex A.

To increase legibility, a sans serif font in the contrast colour as defined in Table 3 shall be used. To

increase readability, upper-case and lower-case letters shall be used. See Figure 1.

Figure 1 — Example of content name “Air” in the contrast colour white on the basic

identification colour blue
5.4 Flow direction indicators

The safety information system uses arrows to indicate the flow direction of the content of the

piping system.

The direction of flow shall be indicated with a single headed arrow (see Figure 2) or, where applicable

(e.g. ring main), with a double-headed arrow (see Figure 3). The shaft of the arrow may be shortened or

lengthened as needed to improve visibility by users at the intended observation distances.

The flow direction indicator shall be black on a white background or the contrast colour on the basic

identification colour or on the safety colour as defined in Table 3.
Key
x length of arrow point
y width of arrow point
Figure 2 — Direction of flow indicator (right)
6 © ISO 2020 – All rights reserved
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ISO 20560-1:2020(E)
Figure 3 — Direction of flow indicator to indicate a flow in either direction
5.5 Warning signs and GHS pictograms

Warning signs and graphical symbols are elements of the safety information system used to

symbolically communicate specific safety meanings. The SDSs, the organization’s risk assessment

or both shall identify the specific warning signs according to ISO 7010, GHS pictograms needed to

communicate hazards associated with the contents of pipes or both. The safety information system’s

warning signs and GHS pictograms shall be displayed on a white background or on the yellow safety

colour. See Figures 4 and 5 for examples.

Figure 4 — Examples of display of warning signs and GHS pictograms on a white background

Figure 5 — Examples of display of warning signs and GHS pictograms on the yellow safety

colour background

NOTE Ranking systems can be used to prioritize and reduce the number of GHS pictograms that need to be

displayed.

As a result of an organization’s risk assessment, safety information systems on piping may use safety

signs, supplementary text or both to communicate potential hazards not defined in SDSs. Such potential

hazards include:
— temperature extremes of the contents;
— biohazards;
— radiation;
— asphyxiation by oxygen displacement;
— electrical hazards;
— hazards related to pressurized content.
© ISO 2020 – All rights reserved 7
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ISO 20560-1:2020(E)
6 Technical and operational information
6.1 General

The safety information system for piping may include risk assessment-defined operational information

such as:
— additional safety information;
— additional technical information;
— supplementary identification colours.
6.2 Additional safety information

If additional safety information is required by the user, this information shall be placed on the coloured

background next to the content name in the same contrast colour as the content name as defined in

Table 2. Alternatively, the additional safety information shall be the contrast colour black on a white

background.
Examples include:
— high pressure;
— high or low temperature;
— speed;
— quantity of flow.
6.3 Additional technical information

If additional technical information is required by the user, this information shall be the contrast colour

black on a white background.
Examples include:
— pipe identification code according to the piping system;
— from–to information (e.g. “from V09 to P23”);

— line number consisting of outside dimension, product code, system number, line sequence;

— number and pipe classification code;
— short description of function or service.

NOTE As a result of risk assessment the height of additional information text could be smaller than the text

height of the content name (see Annex B).
6.4 Supplementary identification colours

If the content of the piping needs further specification, supplementary identification colours shall be

used. The supplementary identification colours shall be placed on both sides of the basic identification

colour area. On both sides, the width of the supplementary colour area shall be 10 % of the basic

identification colour area.

As a supplementary colour all basic identification colours as defined by Tables 1, 2, 4 and 5 can be used.

The supplementary colour shall be different than the relevant basic identification colour associated

with the content of the pipe. The safety colour yellow shall not be used as a supplementary colour.

8 © ISO 2020 – All rights reserved
---------------------- Page: 13 ----------------------
ISO 20560-1:2020(E)

Supplementary colours together with the basic identification colour are used for some special piping

systems, such as firefighting systems, water service, medical gas applications and maritime systems.

See Annexes C and D for additional information.

Only the combination of the two colours specifies the specific use. If supplementary colours are used,

they shall to be used according to Table 2. For the missing supplementary identification colours, see

Tables 4 and 5.
Table 4 — Supplementary identification colours
Colour
Supplementary White
identification colour
Maroon
Brown
Yellow (brighter than safety
colour yellow)

Table 5 — Colour regions for supplementary identification colours: chromaticity coordinates

and luminance factor for colours externally illuminated by CIE standard illuminant D65

Corner points of colour region
Luminance factor
CIE standard illuminant D65
Colour
CIE 2° standard colorimetric observer
1 2 3 4 Minimum Maximum
White x 0,350 0,295 0,285 0,340 0,75
y 0,360 0,305 0,315 0,370
Maroon x 0,455 0,480 0,480 0,460 0,05 0,1
y 0,359 0,364 0,330 0,330
Brown x 0,475 0,496 0,430 0,415 0,15 0,25
y 0,435 0,415 0,385 0,395
Yellow x 0,460 0,480 0,440 0,427 0,60 0,75
(supplementary)
y 0,509 0,494 0,458 0,472
NOTE Measurement geometry 45°/0° or 0°/45°.
NOTE Further information on colour systems is given in Annex A.
7 Layout requirements

The following specifications should be considered to determine the correct size and ratio of various

elements of a pipe’s safety information system:

— The minimum width of the basic identification colour area or, when used alone, the safety colour

area on thin pipes should be 85 mm. See Figure B.1.

— If the pipe diameter exceeds 150 mm, the minimum width of the basic identification colour area or,

when used alone, the safety colour area should be 120 mm. See Figure B.2.
© ISO 2020 – All rights reserved 9
---------------------- Page: 14 ----------------------
ISO 20560-1:2020(E)

— If the pipe diameter exceeds 500 mm, the minimum width of the basic identification colour area or,

when used alone, the safety colour area should be 200 mm. See Figure B.3.

— For pipes with a diameter up to 500 mm, the minimum colour surface area in mm for the basic

identification colour area or, when used alone, the safety colour area is 50 times the diameter (in

mm) of the pipe. For pipes with a diameter exceeding 500 mm a minimum colour surface area should

be 25 000 mm . See Figure B5 and B.6.

— When a basic identification colour is added on a hazardous substance (yellow) marking, the

minimum width of the safety colour yellow should be 50 % of the width of the basic identification

colour area.
— A maximum of two lines of text should be used for displaying the content name.
— The minimum text height for a safety information system should be 7 mm.

— The minimum arrow point height (y in Figure 2) for a safety information system should be 10 mm.

— The minimum height of warning signs, GHS pictograms or both for a safety information system

should be 20 mm.

— To maximize visibility, the safety information system on the pipe should have sufficient contrast

with the surface on which it is mounted.

— When a pipe will be seen from two sides, the safety information system should appear on both sides

of the pipe.
NOTE For information related to size and observation distances, see Annex B.
8 Installation of safety information systems for piping

Safety information systems for piping shall be permanently mounted on pipes at locations where it

needs to be observed, specifically considering:
— operational
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 20560-1
ISO/TC 145/SC 2
Safety information for the content of
Secretariat: DIN
piping systems and tanks —
Voting begins on:
2020-06-02
Part 1:
Voting terminates on:
Piping systems
2020-07-28
Signaux de sécurité —
Partie 1: Marquage des tuyaux
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 SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 20560-1:2020(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. ISO 2020
---------------------- Page: 1 ----------------------
ISO/FDIS 20560-1:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 20560-1:2020(E)
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 ...................................................................................................................................... 7

6 Technical and operational information ........................................................................................................................................ 8

6.1 General ........................................................................................................................................................................................................... 8

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 ..............................................................................................................................................23

Annex E (informative) Maritime piping systems ..................................................................................................................................24

Bibliography .............................................................................................................................................................................................................................26

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 20560-1:2020(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 145, Graphical symbols, Subcommittee SC

2, Safety identification, signs, shapes, symbols and colours.
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 © ISO 2020 – All rights reserved
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ISO/FDIS 20560-1:2020(E)
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 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.

Many different countries’ national pipe marking standards were reviewed during the development of

this document. Important design concepts contained in these standards were incorporated into this

document.

NOTE Some countries’ statutory regulations could differ in some respect from the requirements given in

this document.
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 20560-1:2020(E)
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

Annex A and ISO 3864-4 which provides colorimetric and photometric properties together with,

as a guideline, 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 purpose 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 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

UNITED NATIONS, Globally harmonized system of classification and labelling of chemicals (GHS), eighth

revised edition, New York and Geneva, 2019, United Nations [viewed 18 May 2020]. Available from:

http:// www .unece .org/ fileadmin/ DAM/ trans/ danger/ publi/ ghs/ ghs _rev08/ ST -SG -AC10 -30 -Rev8e .pdf

3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
— IEC Electropedia: available at http:// 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.
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ISO/FDIS 20560-1:2020(E)
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
3.6
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 might

require operation, maintenance or manipulation of a pipe’s contents.

This safety information system provides critical information that serves to assist in:

— the correct operation and use of the piping system;
— the safe maintenance of the piping system;
— conveying critical information to trained personnel in emergency situations.
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ISO/FDIS 20560-1:2020(E)

The safety information system shall, in a comprehensive and uniform manner, accurately identify

the contents and hazards associated with the content of all piping and material transport systems in

conformity with the contents’ safety data sheets (SDSs). In some cases the safety information system

shall provide, in an integrated, coherent visual manner, specific hazard information related to the pipe

contents. Examples of this information include the exact nature of the substance, temperature, toxicity,

and the risk of asphyxiation if a release of the pipe contents occurs.

The safety information system shall consistently use multiple visual elements to accurately convey

its information, including colours and colour combinations as a coding system, text, safety signs, GHS

hazard pictograms and arrows. The information conveyed by the safety information system shall be

consistent with the organization’s risk assessment and its operation and safety plans.

All elements of a safety information system shall be distinguishable and contrasting from any

neighbouring information and shall be visible from the observation distance intended for safe operation,

intervention or manipulation. When the contents of pipes include hazardous substances (see GHS), the

safety information system shall include distinctive, unambiguous elements and the corresponding

warning signs, GHS hazard pictograms or both.

To avoid confusion, the same safety information system elements shall be consistently used and

installed throughout an organization’s piping system, whether it is a single unit, multiple units on the

same site or a multi-plant operation.
5 Elements of safety information systems for piping
5.1 General

The level of detail required to be displayed in a safety information system for piping will depend on

many factors, such as the type of plant, the complexity of the operation, the availability of check lists

and manuals and the competence and skills of operators. Organizations shall design safety information

systems for piping in accordance with their operational and risk communication needs as identified by

their risk assessment process.
A safety information system for piping shall consist of four key elements:
1) colour coding to identify the nature of the content in the piping;
2) content name;
3) flow direction indicators;
4) when applicable, warning signs, GHS pictograms or both.
5.2 Colour coding to identify the nature of the content in the piping

Safety information systems for piping shall incorporate colour coding that uses the basic identification

colours and the safety colour yellow for hazardous substances.

Where there is no need to further differentiate hazardous substances, the safety colour yellow shall be

used alone, without the addition of a basic identification colour. See Table 1.
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ISO/FDIS 20560-1:2020(E)
Table 1 — Safety colour and basic identification colours
Content of a pipe Colour
Safety colour Hazardous substances Yellow
Basic Gases in either gaseous or liq- Grey
identification uefied condition
colour
Liquids and fixed materials Black
(powder, granulates)
Acids Orange
Alkalis (leaches) Violet
Firefighting medium Red
Water Green
Air Blue

The chromaticity coordinates of a basic identification colour shall fall within the relevant colour region

specified in Table 2. The luminance factor for each colour shall be as specified in Table 2. To measure

the chromaticity coordinates and luminance factor of pipe markings, the test method for ordinary

materials specified in ISO 3864-4:2011, 5.2.1 can be used. The testing shall be carried out on finished

markings or samples that are representative, with regard to the colour and surface texture, of the

material used in the finished marking.
Table 2 — Colour regions for safety colour and basic identification colours:

chromaticity coordinates and luminance factor for colours externally illuminated by CIE

standard illuminant D65
Corner points of colour region
Luminance factor
CIE standard illuminant D65
Colour
CIE 2° standard colorimetric observer
1 2 3 4 Minimum Maximum
Yellow x 0,475 0,538 0,470 0,427 0,45 0,70
y 0,525 0,462 0,424 0,472
Grey x 0,350 0,300 0,290 0,340 0,15 0,50
y 0,360 0,310 0,320 0,370
Black x 0,385 0,300 0,260 0,345 0,03
y 0,355 0,270 0,310 0,395
NOTE 1 Measurement geometry 45°/0° or 0°/45°.
NOTE 2 All colours except yellow and red are amended from ISO 14726.
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ISO/FDIS 20560-1:2020(E)
Table 2 (continued)
Corner points of colour region
Luminance factor
CIE standard illuminant D65
Colour
CIE 2° standard colorimetric observer
1 2 3 4 Minimum Maximum
Orange x 0,590 0,538 0,508 0.550 0,25 0,4
y 0,394 0,382 0,412 0,430
Violet x 0,320 0,319 0,329 0,340 0,1 0,2
y 0,218 0,272 0,295 0,230
Red x 0,705 0,592 0,574 0,663 0,07 0,2
y 0,295 0,291 0,351 0,337
Green x 0,250 0,330 0,330 0,287 0,25 0,35
y 0,580 0,580 0,485 0,439
Blue x 0,160 0,196 0,218 0,205 0,15 0,25
y 0,225 0,250 0,192 0,169
NOTE 1 Measurement geometry 45°/0° or 0°/45°.
NOTE 2 All colours except yellow and red are amended from ISO 14726.
NOTE Examples of identification colours are given in Annex A.
5.3 Content name

The pipe’s content name shall be displayed in text elements which can be either the content name or its

chemical formula, or by numbers in accordance with national standards.

Longer words may be abbreviated using standard approved abbreviations known by operators as found

in the organization’s operation safety manuals.

The content name shall be centred and placed within the basic identification colour or in the yellow

safety colour using the contrast colours as defined in Table 3. Alternatively, the content name shall be

the contrast colour black on a white background.

Table 3 — Contrast colours for content name to be displayed on the safety colour and

basic identification colours
Content of a pipe Basic Contrast
identification colour
colour
Safety colour Hazardous substances Yellow Black
Basic Gases in either gaseous or liq- Grey Black
identification uefied condition
colour
Liquids and fixed materials Black White
(powder, granulates)
Acids Orange Black
Alkalis (leaches) Violet White
Firefighting medium Red White
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ISO/FDIS 20560-1:2020(E)
Table 3 (continued)
Content of a pipe Basic Contrast
identification colour
colour
Water Green White
Air Blue White
NOTE Further information on colour systems is given in Annex A.

To increase legibility, a sans serif font in the contrast colour as defined in Table 3 shall be used. To

increase readability, upper-case and lower-case letters shall be used. See Figure 1.

Figure 1 — Example of content name “Air” in the contrast colour white on the basic

identification colour blue
5.4 Flow direction indicators

The safety information system uses arrows to indicate the flow direction of the content of the

piping system.

The direction of flow shall be indicated with a single headed arrow (see Figure 2) or, where applicable

(e.g. ring main), with a double-headed arrow (see Figure 3). The shaft of the arrow may be shortened or

lengthened as needed to improve visibility by users at the intended observation distances.

The flow direction indicator shall be black on a white background or the contrast colour on the basic

identification colour or on the safety colour as defined in Table 3.
Key
x length of arrow point
y width of arrow point
Figure 2 — Direction of flow indicator (right)
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ISO/FDIS 20560-1:2020(E)
Figure 3 — Direction of flow indicator to indicate a flow in either direction
5.5 Warning signs and GHS pictograms

Warning signs and graphical symbols are elements of the safety information system used to

symbolically communicate specific safety meanings. The SDSs, the organization’s risk assessment

or both shall identify the specific warning signs according to ISO 7010, GHS pictograms needed to

communicate hazards associated with the contents of pipes or both. The safety information system’s

warning signs and GHS pictograms shall be displayed on a white background or on the yellow safety

colour. See Figures 4 and 5 for examples.

Figure 4 — Examples of display of warning signs and GHS pictograms on a white background

Figure 5 — Examples of display of warning signs and GHS pictograms on the yellow safety

colour background

NOTE Ranking systems can be used to prioritize and reduce the number of GHS pictograms that need to be

displayed.

As a result of an organization’s risk assessment, safety information systems on piping may use safety

signs, supplementary text or both to communicate potential hazards not defined in SDSs. Such potential

hazards include:
— temperature extremes of the contents;
— biohazards;
— radiation;
— asphyxiation by oxygen displacement;
— electrical hazards;
— hazards related to pressurized content.
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ISO/FDIS 20560-1:2020(E)
6 Technical and operational information
6.1 General

The safety information system for piping may include risk assessment-defined operational information

such as:
— additional safety information;
— additional technical information;
— supplementary identification colours.
6.2 Additional safety information

If additional safety information is required by the user, this information shall be placed on the coloured

background next to the content name in the same contrast colour as the content name as defined in

Table 2. Alternatively, the additional safety information shall be the contrast colour black on a white

background.
Examples include:
— high pressure;
— high or low temperature;
— speed;
— quantity of flow.
6.3 Additional technical information

If additional technical information is required by the user, this information shall be the contrast colour

black on a white background.
Examples include:
— pipe identification code according to the piping system;
— from–to information (e.g. “from V09 to P23”);

— line number consisting of outside dimension, product code, system number, line sequence;

— number and pipe classification code;
— short description of function or service.

NOTE As a result of risk assessment the height of additional information text could be smaller than the text

height of the content name (see Annex B).
6.4 Supplementary identification colours

If the content of the piping needs further specification, supplementary identification colours shall be

used. The supplementary identification colours shall be placed on both sides of the basic identification

colour area. On both sides, the width of the supplementary colour area shall be 10 % of the basic

identification colour area.

As a supplementary colour all basic identification colours as defined by Tables 1, 2, 4 and 5 can be used.

The supplementary colour shall be different than the relevant basic identification colour associated

with the content of the pipe. The safety colour yellow shall not be used as a supplementary colour.

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ISO/FDIS 20560-1:2020(E)

Supplementary colours together with the basic identification colour are used for some special piping

systems, such as firefighting systems, water service, medical gas applications and maritime systems.

See Annexes C and D for additional information.

Only the combination of the two colours specifies the specific use. If supplementary colours are used,

they shall to be used according to Table 2. For the missing supplementary identification colours, see

Tables 4 and 5.
Table 4 — Supplementary identification colours
Colour
Supplementary White
identification colour
Maroon
Brown
Yellow (brighter than safety
colour yellow)

Table 5 — Colour regions for supplementary identification colours: chromaticity coordinates

and luminance factor for colours externally illuminated by CIE standard illuminant D65

Corner points of colour region
Luminance factor
CIE standard illuminant D65
Colour
CIE 2° standard colorimetric observer
1 2 3 4 Minimum Maximum
White x 0,350 0,295 0,285 0,340 0,75
y 0,360 0,305 0,315 0,370
Maroon x 0,455 0,480 0,480 0,460 0,05 0,1
y 0,359 0,364 0,330 0,330
Brown x 0,475 0,496 0,430 0,415 0,0,15 0,25
y 0,435 0,415 0,385 0,395
Y e l l o w x 0,460 0,480 0,440 0,427 0,60 0,75
(supplementary)
y 0,509 0,494 0,458 0,472
NOTE Measurement geometry 45°/0° or 0°/45°.
NOTE Further information on colour systems is given in Annex A.
7 Layout requirements

The following specifications should be considered to determine the correct size and ratio of various

elements of a pipe’s safety information system:

— The minimum width of the basic identification colour area or, when used alone, the safety colour

area on thin pipes should be 85 mm. See Figure B.2.

— If the pipe diameter exceeds 150 mm, the minimum width of the basic identification colour area or,

when used alone, the safety colour area should be 120 mm. See Figure B.3.
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ISO/FDIS 20560-1:2020(E)

— If the pipe diameter exceeds 500 mm, the minimum width of the basic identification colour area or,

when used alone, the safety colour area should be 200 mm.

— For pipes with a diameter up to 500 mm, the minimum colour surface area in mm for the basic

identification colour area or, when used alone, the safety colour area is 50 times the diameter (in

mm) of the pipe. For pipes with a diameter exceeding 500 mm a minimum colour surface area should

be 25 000 mm . See Figure B5 and B.6.

— When a basic identification colour is added on a hazardous substance (yellow) marking, the

minimum width of the safety colour yellow should be 50 % of the width of the basic identification

colour area.
— A maximum of two lines of text should be used for displaying the content name.
— The minimum text height for a safety information system should be 7 mm.

— The minimum arrow point height (y in Figure 2) for a safety information system should be 10 mm.

— The minimum height of warning signs, GHS pictograms or both for a safety information system

should be 20 mm.
— To maximize visibility, the safety information system on the pi
...

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