| VELOCITY FLOWS | |||||||||
| CAST IRON PIPE | |||||||||
| Nominal Pipe Size | |||||||||
| Velocity | 2 in | 2-1/4 in | 3 in | 4 in | 6 in | 8 in | 10 in | 12 in | Velocity |
| ft/s | Flow: gpm* | ft/s | |||||||
| 1 | 9.8 | 12.4 | 22.0 | 39.2 | 88.1 | 156.7 | 244.8 | 352.5 | 1 |
| 2 | 19.6 | 24.8 | 44.1 | 78.3 | 176.3 | 313.3 | 489.6 | 705.0 | 2 |
| 3 | 29.4 | 37.2 | 66.1 | 117.5 | 264.4 | 470.0 | 734.4 | 1057.5 | 3 |
| 4 | 39.2 | 49.6 | 88.1 | 156.7 | 352.5 | 626.7 | 979.2 | 1410.0 | 4 |
| 5 | 49.0 | 62.0 | 110.2 | 195.8 | 440.6 | 783.4 | 1224.0 | 1762.5 | 5 |
| 6 | 58.8 | 74.4 | 132.2 | 235.0 | 528.8 | 940.0 | 1468.8 | 2115.1 | 6 |
| 7 | 68.5 | 86.8 | 154.2 | 274.2 | 616.9 | 1096.7 | 1713.6 | 2467.6 | 7 |
| 8 | 78.3 | 99.1 | 176.3 | 313.3 | 705.0 | 1253.4 | 1958.4 | 2820.1 | 8 |
| 9 | 88.1 | 111.5 | 198.3 | 352.5 | 793.1 | 1410.0 | 2203.2 | 3172.6 | 9 |
| 10 | 97.9 | 123.9 | 220.3 | 391.7 | 881.3 | 1566.7 | 2448.0 | 3525.1 | 10 |
| 11 | 107.7 | 136.3 | 242.4 | 430.8 | 969.4 | 1723.4 | 2692.8 | 3877.6 | 11 |
| 12 | 117.5 | 148.7 | 264.4 | 470.0 | 1057.5 | 1880.0 | 2937.6 | 4230.1 | 12 |
| 13 | 127.3 | 161.1 | 286.4 | 509.2 | 1145.7 | 2036.7 | 3182.4 | 4582.6 | 13 |
| 14 | 137.1 | 173.5 | 308.4 | 548.3 | 1233.8 | 2193.4 | 3427.2 | 4935.1 | 14 |
| 15 | 146.9 | 185.9 | 330.5 | 587.5 | 1321.9 | 2350.1 | 3672.0 | 5287.6 | 15 |
| * Flows calculated with factors in Table 320 may vary slightly due to rounding off of factors. | |||||||||
