Richard, I'm going to take a stab at this, although I'm not 100% confident on my read.
* Going with IBC scoping, one option would be to upgrade the separation to a 3-hour fire wall as this would make the structure two separate buildings. I think the big issue here would be number of allowable penetrations through the fire wall being a limiting factor. * Alternatively, the IBC does have provisions for separating a building into fire areas using fire barriers under the general fire protection provisions per 901.7 and 707.3.10. This should only need to be 2-hour rated, but unfortunately section 905-standpipes doesn't reference fire areas at all. It could still be a decent arguing point in your favor though since it has some logical merit. * If you can't use either option to limit the system design flow, then one creative thought would be to have the one system but install two separate FDCs at the far ends of the building as allowed by NFPA-14(2024) 10.7.3.3, so that each half of the building has its own primary supply point. This would potentially allow you to size the distribution piping based on a max of 750-gpm though any one section of pipe which sounds like it would make installation a hell of a lot easier. * Last, is your water supply issue the overall total capacity of 37,500 gallons or needing to hit 1250-gpm? If the hydrant supply can hit 750-gpm but not the 1250 then perhaps you could install a 20,000-gallon dry hydrant dedicated to the second FDC which would likely be pretty far away from the street. Hope this helps! Sincerely, Eric Rieve, SET Rieve Fire Protection From: [email protected] <[email protected]> Sent: Wednesday, April 3, 2024 9:43 AM To: 'Discussion list on issues relating to automatic fire sprinklers' <[email protected]> Subject: [Sprinklerforum] Standpipe Calculations Asking this on behalf of Rowe Sprinkler Systems (Temporally Un-Retired) We have a 4-story modular apartment building sprinklered in accordance with NFPA 13R with allowed exceptions, with 4 standpipes. The standpipes are connected at the 1st floor level. One each at the ends of the L shaped building and two at the approximate mid-point on either side of a 2-hour separation wall with self-closing, rated doors in the corridor. The question is for purposes of calculating the standpipe can these be treated as two separate buildings? For example, 250 gpm at the far end of the 4th floor, 250 gpm at the far end of the 3rd floor and 250 gpm at the at the connecting point of the middle standpipe, for a total of 750 gpm. Or do we have to calculate the additional standpipes up to 1250 gpm. Available water is the issue. Richard L. Mote CET Rimrock Design Services, LLC Middleburg, PA 17842 Mobile 570-541-2685 EMAIL [email protected]<mailto:[email protected]> WEB: www.rimrockdesignservicesllc.com
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