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Pipe Markers
| Outside Diameter of Pipe |
Size of Letters |
| 3/4" to 1-1/4" | 1/2" |
| 1-1/2" to 2" | 3/4" |
| 2-1/2" to 6" | 1-1/4" |
| 8" to 10" | 2-1/2" |
| Over 10" | 3-1/2" |
| Note: For pipes less than 3/4" in diameter, a permanently legible tag is recommended. | |
ANSI / ASME Standard A13.1-2007
The ANSI / ASME Standard for pipe identification is a widely used guideline in determining pipe identification requirements. The purpose of the standard is to "assist in identification of hazardous materials conveyed in piping systems and their hazards when released into the environment. Pipes are defined as conduits for the transport of gases, liquids, semi-liquids or fine particulate dust."
Size Recommendations
The A13.1-1996 standard makes recommendations for the size of letter height and length of color field for various pipe diameters. These recommendations are shown in the table to the right. Our pipe markers, used properly with arrows and banding tape or arrow tape, meet or exceed the standard.
 Hazardous MaterialsMaterial examples
All pipe markers of this classification are printed as black on yellow. |
 Low Hazard MaterialsMaterial examples
All liquids of this classification are printed as white on green. All gases are printed as white on blue. |
 Fire-Quenching MaterialsMaterial examples
All pipe markers of this classification are printed as white on red. |
Toxic or CorrosiveHazardous material, toxic and corrosives (e.g. chlorine). All pipe markers of this classification are printed as white on orange. |
Combustible FluidsGreases, heavy oils and combustible waste (e.g. kerosene and helium). All pipe markers of this classification are printed as white on brown. |
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Pipe Marking Diagram
