ISO 14726:2008 Pipe Markers Color Coding

Color Coding principles ISO 14726

ISO 14726 defines color coding based on pipe fluid classes.

Initially, aka in ISO 14726-1:1999, only one color, later called main color, was used to represent the generic class of the fluid, out of 12 defined classes.

ISO 14726-2:2002 added a secondary color to be used in complement of the main color to identify subclasses.

ISO 14726 also roughtly defines how these colors should be used, with the main color being on the "outside" and occupying at least 50% of the total marker surface.

Fluid Classes: Main Colors ISO 14726:1999

Main classes and associated colors, "coded" in the ISO documentation using a short code, with their colorimetry defined, are as follows:

Full List of Fluid classes and subclasses with their color combinations ISO 14726:2008

Below you will find fluid class "tabs", one per main ISO fluid class, displaying all defined subclasses, related colors^* combination and sample using:

• right & left bands in primary color with directional arrow,
• center band with secondary color and single legend.

Also of notes:

• missing combinations can be used for user-defined fluid subclasses, as long as main color is correctly assigned,
• legends are also often project specifics, in multiple langages etc.

* Colors above are indicative and do not reflect actual compliant colors used for markers.