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P2903.8.1 Sizing of Manifolds
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Manifolds shall be sized in accordance with Table P2903.8.1. Total gallons per minute is the demand for all outlets.
TABLE P2903.8.1
MANIFOLD SIZINGa
| PLASTIC | METALLIC | ||
| Nominal Size ID (inches) | Maximumb gpm | Nominal Size ID (inches) | Maximumb gpm |
| 3/4 | 17 | 3/4 | 11 |
| 1 | 29 | 1 | 20 |
| 11/4 | 46 | 11/4 | 31 |
| 11/2 | 66 | 11/2 | 44 |
For SI: 1 inch = 25.4 mm, 1 gallon per minute = 3.785 L/m, 1 foot per second = 0.3048 m/s.
- See Table P2903.6 for w.s.f.u and Table P2903.6(1) for gallon-per-minute (gpm) flow rates.
- Based on velocity limitation: plastic, 12 feet per second; metal, 8 feet per second.
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