ASME/ANSI A13.1 Pipe Marking Requirements
Identification of Piping Systems
ASME/ANSI A13.1 is a standard intended to establish a common system to identify hazardous materials flowing through piping systems. The 2007 update to the standard specifies the exact colors to use for pipe marking, and identifies four additional user-defined color combinations. While the 2007 standards are required for new installations, existing facilities should maintain consistency with the existing system to avoid confusion.
The following is a summary of the ASME standards for marking and identifying pipes. These standards apply to the pulp and paper industry for marking all chlorine, caustic and acid lines. (These standards also apply to many other industries.) This is intended to be a brief overview, it is not a complete list of all pipe marking specifications.
FREE ANSI/ASME A13.1 - Pipe Marking Guide
Pipe marker labels indicate which pipelines are dangerous, direction of flow, and pipe contents.
| O.D. of pipe or covering Length of the color field |
Size of the letters | ||||
| inches | mm | inches | mm | inches | mm |
| < 3/4" | < 19mm | A permanently legible tag is recommended | |||
| 3/4 - 1-1/4 | 19 - 32 | 8 | 200 | 1/2 | 13 |
| 1-1/2 - 2 | 38 - 51 | 8 | 200 | 3/4 | 19 |
| 2-1/2 - 6 | 64 - 150 | 12 | 300 | 1-1/4 | 32 |
| 8 - 10 | 200 - 250 | 24 | 600 | 2-1/2 | 64 |
| over 10 | over 250 | 32 | 800 | 3-1/2 | 89 |
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