![]() Often times, the flow rate for the residential sprinkler system exceeds this flow rate. A 5/8-inch water meter is rated for a maximum flow rate of 20 gpm. Why the larger size? Because smaller meters cannot move enough water to supply the sprinklers. Normally, a minimum 3/4-inch water meter will be required when multipurpose residential sprinkler systems are installed. This additional 5 gpm ensures that the service line from the supply source to this separation point is sized to support both domestic flow and fire sprinkler flow as needed. In these designs, a five-gallon per minute (gpm) flow must be added at the point where the system piping separates to feed the individual units. ![]() The exceptions to this rule are cases in which the water-service piping supplies more than one dwelling unit. When designing an NFPA 13D-compliant system, domestic plumbing supply does not usually need to be accounted for in the water supply calculation. Photo courtesy of Uponor.ĭepending on the standard used, water supply requirements will vary. The tee is installed to provide a connection to the plumbing fixture(s) within the dwelling. A typical network fire sprinkler installation using PEX tubing.
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