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P2901.2.2 Distribution Pipe Labeling and Marking
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Nonpotable distribution piping shall be purple in color and shall be embossed or integrally stamped or marked with the words: "CAUTION: NONPOTABLE WATER. DO NOT DRINK" or the piping shall be installed with a purple identification tape or wrap. Pipe identification shall include the contents of the piping system and an arrow indicating the direction of flow. Hazardous piping systems shall contain information addressing the nature of the hazard. Pipe identification shall be repeated at intervals not exceeding 25 feet (7620 mm) and at each point where the piping passes through a wall, floor or roof. Lettering shall be readily observable within the room or space where the piping is located.
The color of the pipe identification shall be discernable and consistent throughout the building. The color purple shall be used to identify reclaimed, rain and gray-water distribution systems.
The size of the background color field and lettering shall comply with Table P2901.2.2.2.
SIZE OF PIPE IDENTIFICATION
| PIPE DIAMETER (inches) | LENGTH OF BACKGROUND COLOR FIELD (inches) | SIZE OF LETTERS (inches) |
| 3/4 to 11/4 | 8 | 0.5 |
| 11/2 to 2 | 8 | 0.75 |
| 21/2 to 6 | 12 | 1.25 |
| 8 to 10 | 2 | 2.5 |
| over 10 | 32 | 3.5 |
For SI: 1 inch = 25.4 mm.
Where used, identification tape shall be not less than 3 inches (76 mm) wide and have white or black lettering on a purple field stating "CAUTION: NONPOTABLE WATER—DO NOT DRINK." Identification tape shall be installed on top of nonpotable rainwater distribution pipes and fastened not greater than every 10 feet (3048 mm) to each pipe length, and run continuously the entire length of the pipe.
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