I have a hospital that has two "double hose valves" at the top of two different standpipes on the roof. One is on a helipad and the other is below on a different roof. Both are the most remote locations.
Per NFPA 25, for the 5-year test, I'm supposed to flow 500 gpm at the most remote then an additional 250 gpm at a different standpipe until I reach 1,000 gpm for the fully-sprinklered building.
Can I just flow 500 gpm out of both double-hose valves (2 standpipes), or do I have to flow 500 gpm, then 250 gpm, then 250 gpm using three different standpipes?
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