Identification

Pipework

In Germany, pipework is identified according to DIN 2403. The identification must be attached at suitable intervals to operationally-critical or hazardous points and contain the following elements:

Flow arrow
Flow material (word, chemical formula, identification number or code)
Danger pictogram, if applicable (e.g. with combustible gases/fluids, acids and alkalis)

Info on Hazardous substances

Flow material	Group	Group colour	Additional colour	Lettering/arrow/edge colour
Water	1	Green	–	White
Water vapour	2	Red	–	White
Air	3	Grey	–	Black
Combustible gases	4	Yellow	Red	Black
Non-combustible gases	5	Yellow	Black	Black
Acids	6	Orange	–	Black
Alkalis	7	Violet	–	White
Combustible liquids and solids	8	Brown	Red	White
Non-flammable liquids and solids	9	Brown	Black	White
Oxygen	0	Blue	–	White

Identification of pipework according to DIN 2403

Group colour/additional colour	Identification colours according to DIN 5381
Green	RAL 6032 signal green
Red	RAL 3001 signal red
Grey	RAL 7004 signal grey
Yellow	RAL 1003 signal yellow
Orange	RAL 2010 signal orange
Violet	RAL 4008 signal violet
Brown	RAL 8002 signal brown
Blue	RAL 5005 signal blue
Black	RAL 9004 signal black
White	RAL 9003 signal white

Identification colours according to DIN 5381

Hazardous substances

The hazard symbols (identification of hazardous substances) must be implemented according to the European CLP ordinance.

The ordinance (EC) No. 1272/2008 for classification, labelling and packaging of substances and mixtures (CLP ordinance) adapts the EU legal regulations to the globally harmonised system for classification and identification of chemicals (GHS).