Sprinkies: Section 6.10.2.1 (2022 edition) of NFPA 13 prescribes a minimum flow rate of 10 fps for flushing, and Table 6.10.2.1.3 offers flow minimum rates for different pipe diameters that will achieve that velocity. My question is (the one that's been posed to me by an inspector) is whether or not there's an absolute minimum flow rate in GPM based on size. A contractor has proposed to flush a 4" UG through a 1½" connection with "several hundred feet" of 1½" hose to a collection point. The inspector is questioning (and I'm wondering also) if it is required or is the intent to flush to at least the demand of the system, or some other benchmark flow? For whatever it's worth Table 6.10.2.1.3 (10.10.2.1.3 in NFPA 24) starts at 2", so I'm also curious if that implies that 2" is the minimum allowable size for a flushing connection?
[cid:[email protected]] Steve Leyton, President T | 619.255.8964 x 102 | www.protectiondesign.com<http://www.protectiondesign.com/> 2851 Camino Del Rio South | Suite 210 | San Diego, CA 92108 Fire Protection System Design | Consulting | Planning | Training
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