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// CODE SNIPPET

P2910.9.6 Overflow

Residential Code 2018 of Kansas > 29 Water Supply and Distribution > P2910 Nonpotable Water Systems > P2910.9 Nonpotable Water Storage Tanks > P2910.9.6 Overflow
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The storage tank shall be equipped with an overflow pipe having a diameter not less than that shown in Table P2910.9.6. The overflow outlet shall discharge at a point not less than 6 inches (152 mm) above the roof or roof drain; floor or floor drain; or over an open water-supplied fixture. The overflow outlet shall be covered with a corrosion-resistant screen of not less than 16 by 20 mesh per inch (630 by 787 mesh per m) and by 1/4-inch (6.4 mm) hardware cloth or shall terminate in a horizontal angle seat check valve. Drainage from overflow pipes shall be directed to prevent freezing on roof walks. The overflow drain shall not be equipped with a shutoff valve. Not less than one cleanout shall be provided on each overflow pipe in accordance with Section P3005.2.
TABLE P2910.9.6
SIZE OF DRAIN PIPES FOR WATER TANKS
TANK CAPACITY
(gallons)
DRAIN PIPE
(inches)
Up to 7501
751 to 150011/2
1501 to 30002
3001 to 500021/2
5001 to 75003
Over 75004
For SI: 1 gallon = 3.875 liters, 1 inch = 25.4 mm.

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