Pipe Marking Guide
ASME (ANSI) A13.1-2007 visibility standard states that markers shall be located so that they are readily visible to plant personnel from the point of normal approach.
Outside Diameter Length of Color Field Size of Letters Over 10 in.
32 in. 3.5 in.
8 in. to 10 in.
24 in. 2.5 in.
2.5 in. to 6 in.
12 in. 1.25 in.
1.5 in. to 2 in.
8 in. 0.75 in.
0.75 in. to 1.25 in.
5 in. 0.5 in.
less than 0.75 in.
Permanently legible tag recommended
At all valves and flanges At all direction changes At both sides of floor or wall penetrations Every 25 to 50 ft. intervals on straight runs Placement of the marker may be above or below the centerline of the pipe, depending on the normal approach of personnel
The text and directional flow arrow is the primary means of identifying pipe content. A13.1-2007 standard makes recommendations as to the size of letter height and length of color field for various pipe diameters.
ASME (ANSI) Standard A13.1-2007
The ASME (ANSI) Standard for pipe identification is a widely used guideline in determining pipe identification requirements. The purpose of the standard is to: Assist in identification of hazardous materials conveyed in piping systems and their hazards when released into the environment Pipes are defined as conduits for the transport of gases, liquids, semi-liquids or fine particulate dust
Pipe marker colors communicate the type of contents, and are particularly important when outside agencies are called in under emergency conditions.
Pipe Classification Color Scheme
Fire quenching fluids White on Red Toxic and corrosive fluids Black on Orange Flammable fluids Black on Yellow Combustible fluids White on Brown Potable, cooling, boiler feed and other water White on Green Compressed air White on Blue
Custom colors available including gray, black, purple and clear.