Piping Contents

DOE-STD-1044-93

Arrows must be used with labels to indicate the direction of flow

The label and arrow, or the pipe itself, should be color-coded to indicate the contents and

level of hazard. The following color codes have been identified for this purpose:

Piping Contents

Label Color

Legend Color

Materials inherently hazardous

Yellow

Black

(e.g., flammable, chemically active,

toxic, dangerous temperatures or pressures,

radioactive)

Low-hazard liquids or liquid admixtures near

Green

White

ambient temperature and pressure

Low-hazard gases or gaseous admixtures near

Blue

White

ambient temperature and pressure

Fire quenching materials

Red

White

(e.g., water, foam, CO2, Halon, etc.)

Labels (with arrows) are required in the following locations:

Close to valves or flanges

Adjacent to changes in direction and branches

Both sides of barrier penetrations (where pipes pass through walls or floors)

At intervals on straight pipe runs sufficient for identification.

B-5