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608.8.2 Distribution pipe labeling and marking.
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 also 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.
608.8.2.1 Color.
The color of the pipe identification shall be discernable and consistent throughout the building. The color purple shall be used to identify nonpotable water distribution systems.
608.8.2.2 Lettering size.
Pipe Diameter (inches) | Length Background Color Field (inches) | Size of Letters (inches) |
3/4 to 1 1/4 | 8 | 0.5 |
1 1/2 to 2 | 8 | 0.75 |
2 1/2 to 6 | 12 | 1.25 |
8 to 10 | 24 | 2.5 |
over 10 | 32 | 3.5 |
For SI: 1 inch = 25.4 mm.
608.8.2.3 Identification tape.
Where used, identification tape shall be at least 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 water distribution pipes, fastened at least every 10 feet (3048 mm) to each pipe length and run continuously the entire length of the pipe.
608.9 Reutilization prohibited.
Water utilized for the cooling of equipment or other processes shall not be returned to the potable water system. Such water shall be discharged into a drainage system through an air gap or shall be utilized for nonpotable purposes.
608.10 Reuse of piping.
Piping that has been utilized for any purpose other than conveying potable water shall not be utilized for conveying potable water.
608.11 Painting of water tanks.
The interior surface of a potable water tank shall not be lined, painted or repaired with any material that changes the taste, odor, color or potability of the water supply when the tank is placed in, or returned to, service. Linings, paints, and repairs must be in accordance with the requirements of the Department of Health and Mental Hygiene.
608.12 Pumps and other appliances.
Water pumps, filters, softeners, tanks and other devices that handle or treat potable water shall be protected against contamination.
608.13 Backflow protection.
Means of protection against secondary backflow shall be provided in accordance with Sections 608.13.1 through 608.13.10 and tested and inspected in accordance with Chapter 3.
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