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Maximum water flow capacity of steel pipes - dimensions 2 - 24 inches
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Unfortunately no single recommendation will be correct for all possible circumstances, but the table below can be used as a general guidance for the water flow capacity in Steel pipes schedule 40:
| Pipe Size
(inch) |
Maximum Flow
(gal/min) |
Velocity
(ft/s) |
Head Loss
(ft/100ft) |
| 2 | 45 | 4.3 | 3.9 |
| 2 1/2 | 75 | 5.0 | 4.1 |
| 3 | 130 | 5.6 | 3.9 |
| 4 | 260 | 6.6 | 4.0 |
| 6 | 800 | 8.9 | 4.0 |
| 8 | 1,600 | 10.3 | 3.8 |
| 10 | 3,000 | 12.2 | 4.0 |
| 12 | 4,700 | 13.4 | 4.0 |
| 14 | 6,000 | 14.2 | 4.0 |
| 16 | 8,000 | 14.5 | 3.5 |
| 18 | 10,000 | 14.3 | 3.0 |
| 20 | 12,000 | 13.8 | 2.4 |
| 24 | 18,000 | 14.4 | 2.1 |
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