Is there a color code for pipelines?

identifiers as pipe markers or pipe labels. Easy to procure and made to last for a long time, pipeline markers are an excellent visual tool to apply to facilities needing more clarity in the realm of hazardous chemical identification. Aside from being a good tool to improve workplace safety, pipe markers are actually required by OSHA for employers to provide a safe workplace for their employees.

There are several parts that go into a properly made pipe label. The first one being the color of the pipe. The ANSI/ASME A13.1 standard is the rule to follow as OSHA references it in their own regulations. The color scheme goes as follows:

  • Black text on a yellow label means the pipe contents could be a flammable or oxidizing fluid.
  • White text on a red label means the pipe contents are fire-quenching fluids.
  • Black text on an orange label means the pipe contents are toxic and corrosive.
  • White text on a green label means the pipe contains water.
  • White text on a blue label means the pipe contains air.
  • White text on a brown label means the pipe contains combustible fluids.

The next requirement for pipe labels includes the text. This is what will directly state the name of the pipe’s contents. It could be ammonia, compressed air, oil, natural gas, or anything else that a facility might need for its normal operations. Lastly, there are usually arrows to indicate the direction of flow for the pipe’s contents. This is important in regard to knowing where the contents lead to and where the valves are located.

It is important to note that pipeline labeling is not solely restricted to these general rules. There are in fact pipe marking standards for marine vessels, medical gases, water treatment, and commercial buildings.


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