Pipe Label Colors

The colors of your label are based on what is flowing through the pipe

pipe labeling colors

Pipe Labeling Colors

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ANSI / ASME A13.1 standards define the proper colors schemes for pipe labeling. The A13.1-1996 standards were replaced by the updated A13.1-2007 standard, though both are still widely used. Both pipe labeling color schemes are referenced below - depending on your company policy, compliance update schedules and existing labeling, you may choose to use either standard.


ANSI / ASME A13.1-1996 Standard
Classification Sub-Classification Label Color
Materials Inherently Hazardous
  • Flammable or Explosive
  • Chemically Active or Toxic
  • Extreme Temperature or Pressure
  • Radioactive
 BLACK ON YELLOW
Materials of Inherently Low Hazard Liquid or Liquid Admixture WHITE ON GREEN
Gas or Gaseous Admixture WHITE ON BLUE
Fire Quenching Materials Water, Foam, CO2, Halon, etc. WHITE ON RED


ANSI / ASME A13.1-2007 Standard
Fluid Service Color Scheme
Fire Quenching Fluids WHITE ON RED
Toxic and Corrosive Fluids BLACK ON ORANGE
Flammable Fluids BLACK ON YELLOW
Combustible Fluids WHITE ON BROWN
Potable, Cooling, Boiler Feed and other water WHITE ON GREEN
Compressed Air WHITE ON BLUE