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Identification of pipelines DIN

Kennzeichnung von Rohrleitungen nach dem Durchflussstoff Supersedes March 1965 edition

In keeping with current practice in standards published by the International Organization for Standardization (ISO),

a comma has been used throughout as the decimal marker

1 Field of application

This standard specifies the colours for the identification of pipelines in above ground installations according to the

fluid conveyed

2 Scope

A clear identification of the pipelines according to the fluid conveyed serves the interests of safety, correct repair and

effective fire fighting It is intended to point out hazards, in order to avoid accidents and damage to health

3 Identification

is

- Anwenderinformation

Die Originalfassung der Norm enthalt Elemente, z.B farbige Abbildungen oder Tabellen, die in dieser gescannten Form der Norm nicht originalge- treu darstellobar sind Dies muB bei der Anwendung berUcksichtigt werden MaBgebend fur das Anwen- den jeder DIN-Norm ist deren Originalfassung mit dem neuesten Ausgabedatum Vergewissern Sie

sich bitte in den DIN-Mitteilungen, im ‘aktuellen

DIN-Katalog mit dem neuesten Erganzungsheft oder in der aktuellen Ausgabe der PERINORM

Lonunues on pages 2 to 8

Beuth Verlag GmbH, Berlin 30, has exclusive sale rights for German Standards (DIN-Normen) DIN 2403 Engl Price group 10

01.95

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UDC 621.644.2.02/.03 : 62-777 DEUTSCHE NORM March 1984

Identification of pipelines according to the fluid conveyed

DIN

2403

1

2

3

Kennzeichnung von Rohrleitungen nach dem Durchflussstoff

In keeping with current practice in standards published by the International Organization for Standardization (ISO),

a comma has been used throughout as the decimal marker

Dimensions in mm

Field of application

This standard specifies the colours for the identification of pipelines in above ground installations according to the

fluid conveyed

Scope

A clear identification of the pipelines according to the fluid conveyed serves the interests of safety, correct repair and

effective fire fighting It is intended to point out hazards, in order to avoid accidents and damage to health

Identification

The pipelines shall be clearly identified by labels specifying the nature of the fluid conveyed If a colour identification

is used, then

either labels or adhesive labels in the colour identifying the group of fluids conveyed shown in table 1 shall be used

or

colour bands in the colour identifying the group of fluids conveyed shall be fitted or

the pipeline shall be painted over the whole length in the colour identifying the group of fluids conveyed or labels, adhesive tabels or colour bands shall be placed at important points, e.g at both sides of each valve, at junctions, wall penetrations

Supersedes March 1965 edition

Continued on pages 2 to 8

Beuth Verlag GmbH, Berlin 30, has exclusive sale rights for German Standards (DIN-Normen)

01.95

DIN 2403 Engl Price group 10

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Page 2 DIN 2403

4 Allocation of colours to the pipe contents

The fluids conveyed through pipelines are divided into 10 groups in accordance with their general properties, and their

colours are given in table 1

Table 1

Colour reference Nearest colour sample

Pipe contents Group Colour name (as specified in in accordance with

DIN 6164 Part 1) RAL 840 HR

with auxiliary

with auxiliary

Non-combustible gases 5 black N:0:9,5 RAL 9005

or

or

with auxiliary

with auxiliary

or

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DIN 2403 Page 3

5 Shape and arrangement of labels

The shape of the labels with border shall be as shown in figures 1 to 6 The size a X shall be selected from DIN 825

Part 1, e.g 74 mm X 210 mm

The pointed end of the label shows the direction of flow of the fluid conveyed If the direction of flow alternates, labels with pointed ends at both sides shall be used, as shown in figure 4

The labels shall be durable and sufficiently strong (adhesive labels, labels made from laminated plastics, enamelled labels, adhesive tape etc.)

6 Identification on the label

The fluid shall be identified by words, a chemical symbol, code or abbreviation, and possibly by the colour in accordance with clause 4

\f an auxiliary colour is to be applied to the pipeline by colour banding, then the basic identification colour shall be pre- dominant

6.1 Green, red, blue, violet, brown and black labels shall have white lettering

White, yellow, orange and grey labels shall have black lettering The edges shail be in the same colour as the lettering

6.2 If acode is used, the number before the dot shows the number identifying the group of fluids, to which the fluid

conveyed belongs The number after the dot shows the family of fluids (see table) Other types of fluid can be indicated

by appending further digits

It is recommended that an explanation of the code system used be displayed in a suitable place on the premises

6.3 The following sizes of lettering are recommended, depending on the outside diameter of the pipes, including thermal insulation

Table 2

Outside diameter to 30 | 50 80 | 130 | 160 | 240 | over 240

Size of lettering 12,5 20 25 40 50 63 80 or 100

7 Additional identification

7.1 Additions can be made to the above identification code, e.g by stating the pressure, temperature or other charac- teristics using symbols in accordance with DIN 1304 tn addition, all pipelines conveying radioactive fluids shall be marked with the warning symbol for ionizing radiation in accordance with DIN 25 400

7.2 Pipelines conveying fluids the incorrect handling of which could incur particular dangers may additionally be marked

by an orange band surrounded by a black edge intersecting the pointed end of the label

7.3 If fire extinguishing pipelines are marked red (RAL 3000), then care shall be taken to ensure that they cannot be

confused with steam pipelines If any confusion is possible, the fire extinguishing pipelines shall be identified by an additional white band The white area shall cover 50 % of the total area and each red border 25 % of the total area The letter F (fire extinguishing pipeline) in the colour of the fire extinguishing agent used, e.g green for water, red for steam, shall be placed in the white area

7.4 In water supply systems which are subject to the Verordnung uber Trinkwasser und iiber Brauchwasser fiir Lebens-

mittelbetriebe (Trinkwasserverordnung) (Regulation on drinking water and service water for food processing companies)

pipelines for different supply systems shall, in accordance with article 15 (1) of this regulation, be identified by different colours, unless the pipelines are laid under ground, e.g drinking water pipes with white bands or bands on a green back- ground

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Page 4 DIN 2403

8 Examples for identification on plates or labets

In the following examples of designation pointing to right means direction of flow to the right (R);

pointing to left means direction of flow to the left (L);

pointing both ways means alternating directions of flow (W);

A means name of fluid given;

B means chemical symbol given;

Cc means colour white given additionally

oe " :

Designation of identification on label indicating flow to the right (R), giving the code for raw water 7) (1.1):

Identification DIN 2403 — R 1.1 (see figure 1)

giving the name (A) of fluid 1.1 (raw water ')):

Identification DIN 2403 —R1.1A (see figure 2)

Designation of identification on labet indicating flow.to the right (R), giving the code for steam (2.4):

Identification DIN 2403 — R 2.4 (see figure 3)

Designation of identification on label indicating alternating flow (W), giving the name (A) of fluid 2.4 (steam):

Identification DIN 2403 -W2.4A (see figure 4)

Designation of identification on label indicating flow to the left (L), giving the code for sulfuric acid (6.0):

Identification DIN 2403 — L 6.0 (see figure 5)

giving the chemical symbol (B) for fluid 6.0 (sulfuric acid):

Identification DIN 2403 — L 6.0 B (see figure 6)

giving the chemical symbol (B) for fluid 6.0 (sulfuric acid), specifying white as the auxiliary colour (C):

Identification DIN 2403 —-L6.0BC

1) See subclause 7.4.

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Table 3 Summary

DIN 2403 Page 5

Colour group of fluids Code identifying 2)

Type of fluid

type of fluid Group 1 Water 1.0 Drinking water (see subclause 7.4) 1.1 Raw water

1.2 Service water, clean water

1.3 Treated water 1.4 Distilled water, condensate

1.5 Pressurized water, impounded water

colour green 17 Heavy water

1.8 1.9 Wate water Group 2 Steam

2.0 LP steam up to 1,5 bar gauge pressure

2.2 HP superheated steam or temperature

2.3 Reduced, tapped, back pressure steam

2.4 Vapour 2.5 Vacuum steam (at absolute pressure)

2.8 2.9 Waste steam Group 3 Air

3.0 Fresh air, outside air 3.1 Compressed air (stating the pressure) 3.2 Hot air

3.3 Clean air (conditioned) 3.4

Identification 3.5 irculati ir, flushing ai colour grey 3.6 Recircu ation air, flushing air

3.7 Delivery air 3.9 Exhaust air Group 4 Combustible gases,

including liquefied gases

4.0 Public gas supply

4.2 Hydrogen and gases containing hydrogen

43 Hydrocarbons and their derivatives 4.4 Carbon monoxide and gases containing CO Identification 4.5 Mixed gases (technical gases)

colour yellow 46 tnorganic gases NH3, H2S

or yellow 47 Hot fuel gases

with auxiliary red 4.8

4.9 Combustible waste gases

Group 5 Non-combustible gases,

including liquefied gases

5.0 Nitrogen and gases containing nitrogen 5.1

5.2 Carbon dioxide and gases containing COz 5.3 Sulfur dioxide and gases containing SO=

Identification 5.4 Chlorine and gases containing chlorine colour yellow sa ower inorganic gases

with auxiliary black as mixtures

or black 5.7 Derivatives of hydrocarbons

5.8 Non-combustible heating gases

5.9 Non-combustible waste gases

2) Codes to which no type of fluid is allocated are spares for possible additions

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Page 6 DIN 2403

Table 3 (continued)

Code identifying 2)

Colour group of fluids type of fluid Type of fluid

Group 6 Acids

6.0 Sulfuric acid

6.1 Hydrochloric acid 6.2 Nitric acid 6.3 Inorganic mixed acids 6.4 Organic acids

6.5 Acid salt solutions Identification 6.6 Oxidizing solutions

6.8 6.9 Acid waste

7.0 Sodium hydroxide solution

7.1 Aqueous ammonia

7.2 Potassium hydroxide solution

7.3 Calcium hydroxide solution

7.4 Other alkaline inorganic liquids 7.5 Alkaline organic liquids Identification 7.6

7.8 7.9 Alkaline waste Group 8 Combustible liquids 8.0 Danger class A | (flash point below 21 °C) 8.1 Danger class A II (flash point above 21 up to 55°C) 8.2 Danger class A II! (flash point above 55 up to 100°C) 8.3 Danger class B (soluble in water, flash point below 21°C) 8.4 Technical greases and heavy oils

8.5 Other organic liquids and pastes

Identification 8.6 Nitroglycerin

colour brown 8.7 Other liquids, including liquid metals

or brown 8.8

with auxiliary red 8.9 Combustible waste

Group 9 Non-combustible liquids

9.0 Liquid foods 9.1 Aqueous solutions

9.2 Other solutions

9.3 Aqueous slurries (mash)

9.4 Other slurries 9.5 Jelly (glue)

colour brown 9.7 Other liquids, including liquid metals

with auxiliary black 9.8

or black 9.9 Non-combustible waste

Group 0 Oxygen 0.0

0.1 0.2 0.3 0.4 0.5 Identification 0.6

colour blue 0.7

0.8 0.9

2) See page 5

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DIN 2403 Page 7

Standards and other documents referred to

DIN 825 Part1 Dimensions of nameplates; square and rectangular nameplates

DIN 1304 Symbols for formulae

DIN 6164 Part 1 DIN colour chart; DIN colour chart system for 2° standard observer

DIN 25 400 Warning symbol for ionizing radiation

RAL 840 HR Colour register

Previous editions

DIN 2403: 10.26, 04.27, 05.32, 12.53x, 03.65

Amendments

The following amendments have been made in comparison with the March 1965 edition:

a) the type of fluid “vacuum” has been deleted and the colour grey allocated to the fluid “‘air’’

b) oxygen has been allocated to group 0 (identification colour blue);

c) the identification of drinking water pipelines in food firms has been included;

d) for non-combustible fluids, the previous identification colours yellow and brown respectively have been changed to

— yellow or brown with auxiliary black

or

— black;

e) for combustible fluids, the previous identification by the colours yellow and brown respectively has been supple-

mented to include the alternative identification by the colours yellow or brown with auxiliary red.

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Page 8 DIN 2403

Explanatory notes

DIN 2403 originated in 1926 and its content was greatly

influenced by the iron and steel industry At that time,

the standard already contained all the present specified

colours, e g yellow as the basic colour for gases and red

for steam Combinations of colours were also specified;

for example, pipes carrying town gas, which were painted

yellow, were provided with a red ring These combina-

tions meet the requirements of industry for further dif-

ferentiation and are therefore still contained in some

works standards in the chemical industry

Simultaneously and quite independently, colour identi-

fication of pressure cylinders according to their filling

was specified in the field of welding, to which was later

added the corresponding identification of the hoses

(DIN 8541) and valves (e.g DIN 8546) The colour

identification of pressure cylinders was specified in

clause 18 of the Technische Grundsatze zur Druckgas-

verordnung (Technical principles relating to the Regula-

tion on compressed gases) and was confirmed by deci-

sion DGA 13/78 of the Deutscher Druckgasausschuss

(German Compressed Gas Committee) In accordance

with this regulation, gas cylinders for acetylene are to be

painted yellow, those for other combustible gases red,

for oxygen blue, for nitrogen green and for all other non-

combustible gases grey !f not completely painted, at least

part of the cylinders are to be painted in these colours

This colour identification has been largely accepted for

pipelines in stationary welding equipment or equipment

supplied from gas cylinder and was intended to render

confusion impossible, taking into account the fire and

explosion hazard arising from gases, by making a clear

distinction between combustible gases, gases supporting

combustion and non-combustible gases

If several identification systems are used simultaneously,

confusion is possible, at least in theory; in one system

red stands for steam and in another it stands for hydrogen

and other combustible gases

The fact that in one identification system, oxygen and air

are identified by the colour blue, while in another only

oxygen is identified by the colour blue, compressed air

being identified by the colour grey, could lead to danger-

ous situations

International Patent Classification

F 17D 1-00

Objections were therefore raised to the April 1977 edi-

tion of draft Standard DIN 2403

It was not possible to reach agreement in negotiations on

these objections, so that D/N-Mitte/lungen (DIN News)

No 11, 1979, published an article inviting comments on alternative solutions to this problem

The comments on this article led to a further draft Standard DIN 2403, issued in October 1981

This draft restricted the use of blue to oxygen only The committee considered it immaterial that grey had previously been used to identify a vacuum, as pipelines either contain air at low pressure or another fluid which then has to be identified by the appropriate colour The colour grey was therefore taken to identify the fluid

29A tt air

Code 3.8, previously used for identifying oxygen, was

therefore deleted

It is recommended that vacuum pipes which are still

identified by grey should have auxiliary black added, in order to avoid confusion with compressed air pipelines

As a consequence of the publication of the Verordnung

uber Trinkwasser und tiber Brauchwasser fiir Lebens-

mittelbetriebe, subclause 7.4, on the identification of

drinking water pipelines has been included

As it was not possible to draw a clear distinction

between dangerous and harmless substances, subclause 7.2 was revised The appropriate identification is left to the user’s discretion

The colour identifying non-combustible gases was changed from yellow to yellow with auxiliary black, or

to black, and the colour identifying non-combustible liquids was changed from brown to brown with auxiliary black or to black, in order to make an unambiguous

identification of combustible gases and liquids possible

For combustible gases and liquids, the identification by auxiliary red, as an alternative to the identification by the appropriate group colour, was included in order to satisfy practical requirements, particularly with regard

to combustibility