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606.5.4 Overflows for Water Supply Tanks
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A gravity or suction water supply tank shall be provided with an overflow with a diameter not less than that shown in Table 606.5.4. 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 so as not to freeze on roof walks.
SIZES FOR OVERFLOW PIPES FOR WATER SUPPLY TANKS
MAXIMUM CAPACITY OF WATER SUPPLY LINE TO TANK (gpm) | DIAMETER OF OVERFLOW PIPE (inches) |
0 — 50 | 2 |
50 — 150 | 21/2 |
150 — 200 | 3 |
200 — 400 | 4 |
400 — 700 | 5 |
700 — 1,000 | 6 |
Over 1,000 | 8 |
For SI: 1 inch = 25.4 mm, 1 gallon per minute = 3.785 L/m.
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