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ANSI Pipe Labeling: Must-Do’s for Pipe Labeling Standards

Color code for quick recognition

Assign specific colors to different pipe contents, such as hazardous materials, fire protection systems or potable water. Consistent color coding simplifies identification and reduces the risk of accidents. Here’s the color-coding system recommended under ASME/ANSI A13.1


Fluid Service Color Scheme
Fire Quenching Fluids White on Red
Toxic & Corrosive Fluids Black on Orange
Flammable & Oxidizing Fluids Black on Yellow
Combustible Fluids White on Brown
Potable, Colling, Boiler Feed, & Other Water White on Green
Compressed Air White on Blue
Defined by User White on Purple
Defined by User Black on White
Defined by User White on Grey
Defined by User White on Black

Match length and letter height to pipe diameter

Ensure that your pipe markers are appropriately sized for optimal visibility. Follow these guidelines by pipe size.


Fits Pipe Outer Diameter 0.7" - 1.3" (18 - 33 mm) 1.4" - 2.4" (34 - 61 mm) 2.5" - 6.7" (62 - 170 mm) 6.8" - 10" (171 - 254mm) Over 10" (Over 254 mm)
Length of Color Field 8 in (203 mm) 8" (203 mm) 12" (305 mm) 24" (610 mm) 32" (813 mm)
Letter Height 0.5" (13 mm) 0.7" (19 mm) 1.3" (32 mm) 2.5" (64 mm) 3.5" (89 mm)

Note: For pipes less than 0.7" diameter, a permanently legible tag is recommended


Place markers in key, high-visibility areas

Position pipe labels on pipes to achieve the best visibility. Install pipe labels below or above the horizontal centerline of the pipe when pipes are located above or below the normal line of vision, respectively. Consider placing pipe markers both near the ceiling and near the floor of your facility. In addition, mark pipes:


  • Adjacent to all valves and flanges
  • At both sides of floor or wall penetrations
  • Adjacent to changes in directions
  • At least every 50 feet on straight runs

Proper placement of marker on pipes
Mark pipes adjacent to all
valves and flanges.
Proper placement of markers on pipes separated by a wall
Mark pipes at both
sides of floor.
Proper placement of markers on pipes with horizontal and vertical orientation
Mark pipes adjacent to
change in direction.
Proper distance of markers on the same pipe
Mark pipes every 25 to 50 foot
intervals on straight runs
For additional guidance, check out our Pipe Marker Standards Walk-Through.