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604.10.1 Manifold Sizing

2017 FBC - Plumbing, 6^th edition > 6 Water Supply and Distribution > 604 Design of Building Water Distribution System > 604.10 Gridded and Parallel Water Distribution System Manifolds > 604.10.1 Manifold Sizing

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Hot water and cold water manifolds shall be sized in accordance with Table 604.10.1. The total gallons per minute is the demand of all outlets supplied.

TABLE 604.10.1

MANIFOLD SIZING

NOMINAL SIZE INTERNAL DIAMETER (inches)	MAXIMUM DEMAND (gpm)
NOMINAL SIZE INTERNAL DIAMETER (inches)	Velocity at 4 feet per second	Velocity at 8 feet per second
¹/₂	2	5
³/₄	6	11
1	10	20
1¹/₄	15	31
1¹/₂	22	44

For SI: 1 inch = 25.4 mm, 1 gallon per minute = 3.785 L/m, 1 foot per second = 0.305 m/s.

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