How to use Pipe Markings with the Proper Color Codes

Utilizing color codes for pipe markings is effectively an unwritten language which defines the contents and functions of a pipe. Across the industry, there are a range of color standards which can be easily recognized by those who maintain the systems and emergency workers, creating efficient operations and enhancing safety measures within the facility. In this article, we discuss some of the key color codes used for pipe markings.

Yellow: Flammable

Yellow pipe markings are widely understood to represent flammable materials which are prone to ignition, combustion, or explosion. It can be applicable to pipes carrying either gas or liquids and common contents can include natural gas, propane, or gasoline.

Brown: Combustible

Portraying contents that are non-flammable but combustible, brown pipe markings are often used for pipes containing substances such as oil, grease, or other non-flammable materials. Using brown instead of yellow pipe markings helps to distinguish the level of risk involved.

Orange: Toxic or hazardous

Orange pipe markings serve as a warning to workers and emergency personnel who may be working on the pipes. This color marking indicates that there are hazards associated with the contents, often meaning that the contents include chemicals, corrosive substances, or other hazardous materials which can cause harm.

Red: Fire protection

Red pipe markings are one of the most widely recognized since all employees should be aware of their meaning. They signify that the pipe contains fire protection materials, whether this be water, foam, or chemical extinguishers. In the event of a fire, the pipe markings are a necessity as emergency workers need to be able to locate them.

Blue: Compressed air

Often found in manufacturing, automotive, and industrial facilities, blue pipe markings signify compressed air. The pipe markings are used in order to prevent contamination of the air and to avoid people accidentally disconnecting the pipes and releasing the air.

Green: Potable water

This color code differentiates between water that is safe for consumption and non-potable water. It is often used for sinks, showers, and drinking fountains but can also be used for other purposes such as boilers, always containing uncontaminated water which aligns with health and safety standards.

Purple: Non-potable water

In contrast to green pipe markings, purple is used to show that water is not suitable for consumption. It is often used in industrial settings where water is needed for other purposes such as cooling, cleaning, or plumbing. The markings are important to avoid accidental misuse and prevent cross-contamination.

Black & white: Miscellaneous

Unlike the previous colors which tend to be standardized across the industry, black and white pipe markings are more specific to the needs of an individual business. If the contents of a pipe doesn’t fit into the standard categories, such as steam or general utility lines, it can be defined by the business. Often these markings are used in conjunction with other colors and an organization should ensure clarity is given to workers on site.