DIN 2403

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The DIN standard DIN 2403 describes the labeling of underground pipelines according to their flow material. A distinction is made between 10 groups. A distinction between the pipe colors is essential in terms of proper maintenance and effective fire fighting. It also serves to point out dangers and to avoid accidents and damage to health.

General

A label must contain:

General information

  • Group color and additional color of the flow substance according to the table below.
  • The direction of flow is indicated by an arrow.
  • The flow substance must be indicated by specifying the name, a chemical formula or an identification number in the appropriate color.

Additional information

  • If it is a hazardous substance according to the Chemicals Act, appropriate hazard symbols must be attached.
  • If it is a radioactive substance, corresponding warnings must be attached in accordance with DIN 4844-2.

Furthermore, the information may be supplemented by operating states that describe the pressure, the temperature or the physical state. Further safety marks or other parameters may also be applied.

Color table

The table describes the RAL color assigned to the respective flow group as well as the font color that is to be used for the labeling and the arrows.

Flow material group RAL color RAL number Color example Additional color
 Font color comment
oxygen 0 Signal blue RAL5005 - White
water 1 Signal green RAL6032 - White including water vapor condensate
Steam 2 Signal red RAL3001 - White
air 3 Signal gray RAL7004 - black
Flammable gases 4th Signal yellow / signal red RAL1003 / RAL3001 black including liquefied gases
Non-flammable gases 5 Signal yellow / signal black RAL1003 / RAL9004 black including liquefied gases
Acids 6th Signal orange RAL2010 - black including gases that react acidic with water
Alkalis 7th Signal violet RAL4008 - White including gases which are alkaline with water
Flammable liquids 8th Signal brown / signal red RAL8002 / RAL3001 White
Non-flammable liquids 9 Signal brown / signal black RAL8002 / RAL9004 White

The groups are divided into sub-classes depending on the substance.

Labelling

Example of the signage for an acetylene pipeline with a hazard symbol
Example of the signage of a hot water pipeline with the operating status temperature

Pipelines are to be clearly and permanently marked in their entire circumference and at most every 10 m over the entire length of the pipe as well as at points that are important for operation and that pose a risk (beginning, end, wall penetrations, fittings). Signs as well as self-adhesive foils or tapes are to be used for identification, the pipes themselves are to be painted in the corresponding group color.
The size of the marking and the associated font size depend on the required recognition distance.

literature

  • Günter Wossog (Ed.): Handbook of pipeline construction. 2nd edition, Vulkan Verlag, Essen 2003, ISBN 3-8027-2723-1 .
  • Peter Kiehl (Ed.): Introduction to the DIN standards. 13th edition, BG Teubner Verlag, Wiesbaden 2001, ISBN 978-3-519-26301-2 .

Web links