ANSI-Compliant Pipe Markers

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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 A13.1-1996

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 Materials

Material examples

Flammable or explosive
Chemically active or toxic
Extreme temperature/pressure
Radioactive

All pipe markers of this classification are printed as black on yellow.

Low Hazard Materials

Material examples

Liquid
Liquid mixture
Gas
Gaseous mixture

All liquids of this classification are printed as white on green. All gases are printed as white on blue.

Fire-Quenching Materials

Material examples

Water
Foam
Carbon dioxide
Halon™

All pipe markers of this classification are printed as white on red.