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:
Info on Hazardous substances
Flow material
Group
Group colour
Additional colour
Lettering/arrow/edge colour
Water
1
Green
–
White
Water vapour
2
Red
Air
3
Grey
Black
Combustible gases
4
Yellow
Non-combustible gases
5
Acids
6
Orange
Alkalis
7
Violet
Combustible liquids and solids
8
Brown
Non-flammable liquids and solids
9
Oxygen
0
Blue
Identification of pipework according to DIN 2403
Group colour/additional colour
Identification colours according to DIN 5381
RAL 6032 signal green
RAL 3001 signal red
RAL 7004 signal grey
RAL 1003 signal yellow
RAL 2010 signal orange
RAL 4008 signal violet
RAL 8002 signal brown
RAL 5005 signal blue
RAL 9004 signal black
RAL 9003 signal white
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).