Pipe Markers

Hazardous materials flow through miles of piping in a wide variety of facilities. Just like hazardous materials in other “containers,” piping systems should be appropriately labeled. The American Society of Mechanical Engineers (ASME) A13.1 Scheme for the Identification of Piping Systems standard addresses pipe marking by offering a common labeling method for use in all industrial, commercial and institutional facilities as well as in buildings used for public assembly. This standard does not apply to buried pipelines or electrical conduit.


Pipe marking labels must effectively communicate the contents of the pipes and give additional detail if special hazards (such as extreme temperatures or pressures) exist. The legend should be short in length and easy to understand. For example, the legend "Steam 100 PSIG" specifies the contents as well as the additional pressure hazard. An arrow should be used in conjunction with the legend to show which direction the material flows. If flow can be in both directions, arrows in both directions should be displayed.

ASME A13.1 was updated in 2007 and reaffirmed in 2013. It uses a color code chart with six standard color combinations and four user-defined. The colors are based on the contents of the pipe and in general, the most hazardous feature of the contents is used to determine the colors used.

We suggest going beyond color coding and use our pip marking products that clearly spell out exactly what is in the pipe. Use our repeating tape or we can customize tape or label for you.

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