Stored water as the second source? Seeing a lot of that here too. One under construction now has public refilling SB turned into a cistern, 400K gallons.
I assumed just a 750 but probably 2 stage maybe using 1.4, not too many 2 stages out there above that so parallels required. Probably what you needed for those hanger nozzles. Interesting as I have an old 3 stage (just looked at) needing replacement for a ’73 installation, no pressure requirement then, in fact 14 not even adopted at the time for the 12 pages it entailed. 445# in the room last week. Scary.. TD We made 360 total head at churn if I recall correctly. Everything downstream UL (USA) listed for fire – had to hunt down check and butterfly valves from Victaulic rated for 365. Here in CA all high-rises have tanks, so PSH of about 7’ + pump rating at max churn. Big pump yes, but not a monster as it was only a 750. We had three or four stairs in the basement and podium levels, so designed to a couple of points on the curve. We’ve done foam underwing systems for Navy and Marine Corp hangars with .17/15,000 flowing concurrently at the roof with total demand of 4,500-5,000 GPM. Now THOSE are big pumps. SL From: Sprinklerforum [mailto:[email protected]] On Behalf Of Tom Duross Sent: Tuesday, August 02, 2016 4:21 PM To: [email protected] <mailto:[email protected]> Subject: RE: HIGH RISE BUILDING Must have been one hell of a pump. There is no height limit in latest editions of NFPA 14. Standpipes that directly supply hose connections are limited to 350 PSI (stay tuned for 2019 cycle on that one) but there is no height or pressure limit on express mains that serve upper zones. Our firm designed a 545’ single zone system for a tower here in San Diego. The foregoing is my opinion only and is not intended to represent the NFPA 14 Technical Committee, nor serve as an interpretation of the standard. Steve L.
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