Pipe marking standards are provided by both the ASME (American Society of Mechanical Engineers) and the ANSI (American National Standards Institute) Code A13.1.
Labels on pipes and valves provide important safety information. They inform employees, contractors, customers, and emergency response teams about the contents of the pipe, the hazard it poses, and the direction of flow through the pipe.
The following is a transcript of the Electrical Injuries Infographic:
ANSI/ASME A13.1 2007 Standard
FLAMMABLE Black on Yellow e.g.: Hydrogen
COMBUSTIBLE White on Brown e.g.: Canola Oil
TOXIC/CORROSIVE Black on Orange e.g.: Nitric Acid
FIRE QUENCHING White on Red e.g.: Fire Water
OTHER WATER White on Green e.g.: Boiled Water
COMPRESSED AIR White on Blue e.g.: Nitrogen
Defined by User White on Black White on Gray White on Purple Black on White
Pipe Marker Placement
Label placement in relation to point of normal approach