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ANSI/ASME Pipe Marking Color Code

03 February, 2023


Do you know the contents of this pipe? Or that one?

Having facility pipes clearly marked with compliant labels allows plant staff, maintenance crews, and emergency workers to quickly identify pipe contents and flow direction.

ANSI, or the American National Standards Institute, uses this color code to identify pipes by the general kinds of materials they contain.

Yellow is flammable, brown is combustible, orange is toxic and corrosive. Red is fire quenching, green is other water, blue is compressed air- and other colors, such as black, grey and purple should be determined by the facility's needs.

For a copy of the ANSI/ASME Pipe Marking color code and for information about pipe marker size or placement-follow the link, fill out the form and receive your free Pipe Marking Quick Reference Guide.