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Pipe Legends - Identification Scheme for Piping Systems
Color codes - field and legend
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A recommended identification color scheme of piping systems based on ANSI A13.1 Standard for Pipe Identification are indicated below:
| Classification | Color Field and Legend | |
| Inherently Hazardous Materials | Flammable or Explosive Fluids | Black text on Yellow background |
| Chemically Active, Toxic or Corrosive Fluids | Black text on Yellow background | |
| Extreme Temperatures or Pressures | Black text on Yellow background | |
| Radioactive | Black text on Yellow background | |
| Inherently Low Hazardous Materials | Liquid or Liquid Admixture, Potable Water, Feed water ... | WhiteText on Green background |
| Gas or Gaseous Admixture, Compressed air .. | White Text on Blue background | |
| Fire Quenching Materials | Water, Foam, CO2, .. | White Text on Red background |
Size of Letters
| Outside Pipe or Covering Size (in) |
Width of Color Band (in) | Size of Letters (in) |
| 3/4" to 1 1/4" | 8 | 1/2" |
| 1 1/2" to 2" | 8 | 3/4" |
| 2 1/2" to 6" | 12 | 1 1/4" |
| 8" to 10" | 24 | 2 1/2 |
| > 10" | 32 | 3 1/2" |
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