ANSI MARKING COLOR RECOMMENDATIONS

Unmarked pipes, tanks, and vessels mean danger - to both life and property. Numerous injuries have occurred through ignorance of pip contents, particularly when outside agencies are called in under emergency conditions. The following is a color recommendation for marking from ASME (ANSI).

The color of the pipe marker is used to identify the hazard level of the pipe contents.

Black on Yellow White on Green White on Blue White on Red
Color Chart