Back to Library
Pipe Color Coding

Pipe Color Coding & Identification

Look up ASME A13.1 pipe marking colors by hazard class, and the minimum legend field length and letter height required for each pipe size.

Quick color code lookup

Find ASME A13.1 pipe marking colors by hazard class.

ASME A13.1
Typical Examples
FirewaterfoamCO₂sprinkler and deluge lines
Label PreviewASME A13.1 Marker
FIRE-QUENCHING FLUIDS
Field (Background)

Red

#C8102E

Legend (Text)

White

#FFFFFF

Hazard Class

Fire

Fire-quenching fluids

Table view

Color scheme table

Showing 10 color classes

ASME A13.1 pipe identification color scheme
LabelContentsField / LegendHazard classTypical examples
RED →Fire-quenching fluidsRed field / White legendFireFirewater, foam, CO₂, sprinkler and deluge lines
ORANGE →Toxic and corrosive fluidsOrange field / Black legendHealth hazardAcids, caustic, chlorine, ammonia, corrosive chemicals
YELLOW →Flammable and oxidizing fluidsYellow field / Black legendFlammabilityFuel gas, LPG, hydrogen, oxygen, flammable solvents
BROWN →Combustible fluidsBrown field / White legendFlammabilityFuel oil, diesel, lube oil, combustible liquids
GREEN →Potable, cooling, boiler-feed and other waterGreen field / White legendLow hazardPotable water, cooling water, boiler feed, condensate
BLUE →Compressed airBlue field / White legendLow hazardPlant and instrument compressed air
PURPLE →User definedUserPurple field / White legendUser assignedAssign per facility — e.g. nitrogen, inert gas
WHITE →User definedUserWhite field / Black legendUser assignedAssign per facility
BLACK →User definedUserBlack field / White legendUser assignedAssign per facility
GRAY →User definedUserGray field / White legendUser assignedAssign per facility