FWIW - That might be Steve’s personal opinion, but I agree with it! Sound solid reasoning.
Thanks, John John August Denhardt, P.E. Vice President Engineering and Technical Services American Fire Sprinkler Association 301.343.1457 - Mobile From: Sprinklerforum <[email protected]> On Behalf Of Steve Leyton via Sprinklerforum Sent: Wednesday, January 22, 2020 12:38 PM To: [email protected] Cc: Steve Leyton <[email protected]>; Zachary Siegrist <[email protected]> Subject: RE: standpipe horizontal exit calculation question The standard doesn’t really address this condition, but I think it’s consistent with the intent and firefighting strategies that if you have to add a 250 GPM allowance for a standpipe that’s only serving one side of a 2-hour building separation, you would add it to the demand on the valve side of the separation because that is where they’d be coming from. But ultimately, it might be best to add it to whichever fire area would create the highest demand. The standard informs that when a single structure is divided into two or more “buildings” by such separations, you have to meet all the demands if they are taken as separate buildings. So if one area is large enough to require three standpipes, then you’d need to prove 1,000 GPM for that area and lower flows for the others. MY OPINION ONLY. Steve Leyton From: Sprinklerforum [mailto:[email protected]] On Behalf Of Zachary Siegrist via Sprinklerforum Sent: Tuesday, January 21, 2020 1:15 PM To: [email protected]<mailto:[email protected]> Cc: Zachary Siegrist Subject: standpipe horizontal exit calculation question In a building recognized as part of separate fire areas, the annex material in NFPA 14 Section 7.10.1.1 states the the total supply can be calculated based on the single bldg/ fire area requiring the greatest number of standpipes. In this scenario, the physical separation between fire areas is functioning as a horizontal exit requiring a hose valves at the horizontal exit. One side of the wall meets the 100 ft. + 30 ft. hose stream exemption while the other side does not. The hose valves will be fed via an independent vertical standpipe riser. Is this hose valve located at the horizontal exit calculated as part of the area it is located in or calculated as part of the building it serves on the opposite side of the horizontal exit? I thought this was addressed somewhere in 14 but I can't locate it. Can anyone help me out this afternoon? Zach
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