The piping and its colors

10.03.2021

Everything related to colors is often subjective and covered with a more or less artistic blur. However, the standardization of colors for pipes has been an objective exception to this rule for years.

This standardization is a solid and internationally standardized basis for the marking of pipes intended for the transport of liquid or gaseous materials on land, or on board ships.

For practical use it is important to assign each color an RAL number. The resulting unambiguous and internationally recognizable color coding makes it easier to identify piping in a large or highly complex network, for example on board ships. It therefore makes a major contribution to safety and to ease of use and maintenance.

Below we take the standardized colors and their meaning.

Standard colors or basic recognition colors

Green Ral 6010
Water
Silver gray Ral 9006 Steam
Brown
Ral 8001
Mineral, vegetable and animal oils; liquid fuels
Yellow Ocher
Ral 1004
Liquefied gas or gas (except air)
Purple Ral 4001
Acids and bases
Light blue
Ral 5012
Air
Black Ral 9005
Other liquids

Safety colors

Red
Ral 3000
Fight against the fire
Yellow
Ral 1018
Danger
Blue
Ral 5010
Pure water


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