The following chart shows the recommended pipe marker letter height and marker size based on the outside pipe diameter of the pipe to be identified. For pipes smaller than 3/4" and for valve identification, the use of a permanent legible tag is recommended.
Pipe O.D. | Text & Arrow Height | Marker Size | Qty of Legends & Arrows | Marker Style | Maximum Characters |
3/4" to 2-1/4" | 3/4" | 8" wide | 240 | Small Roll | 18 |
2-1/2" to 7-7/8" | 1-1/4" | 12" wide | 144 | Large Roll | 18 |
For pipe O.D. of 3/4" to 2-1/4"
Legend Size: 3/4" High
For pipe O.D. of 2-1/2" to 7-7/8"
Legend Size: 1-1/4" High
The secondary means of identification is the color code of the marker. The exact colors are contained in the ANSI Z535.1 Safety Color Code.
Color is the secondary means to identification but many times the most important. The color of the marker should be used to identify the characteristic hazard of the contents of the pipe. The following chart list the classifications shown by ANSI / ASME A13.1 2015 as the suggested color combinations for the pipe markers.
FLUID SERVICE | COLOR COMBINATIONS |
Fire Quenching Fluids | ![]() |
Toxic & Corrosive Fluids | ![]() |
Flammable & *Oxidizing Fluids | ![]() |
Combustible Fluids | ![]() |
Potable, Cooling, Boiler feed, & other Water | ![]() |
Compressed Air | ![]() |
Defined by the User | ![]() |
Defined by the User | ![]() |
Defined by the User | ![]() |
Defined by the User | ![]() |
* New 2015 classification, Oxidizing Fluids |
![]() Install pipe labels close to valves or flanges
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![]() Install pipe labels near branches and whenever a pipe changes direction.
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![]() Install pipe labels before and after all wall, floor and ceiling penetrations
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![]() Install pipe labels at frequent intervals on straight pipe runs.
Brimar recommends 25 ft. |