If you can do without a fire pump on ANY water based system, that’s better than having one. Lower first and continuing costs, more reliable through simplification, it’s a win-win-win. And knowing how FDs use standpipes, a manual system is preferable for any midrise and some FDs might even say they prefer or will treat automatics as manual in high-rise buildings as well, so long as the overall height is within their pumping capacity. It’s about reliability, control and constancy of flow and pressure.
My opinion only, Steve L. From: George Medina Jr. <[email protected]> Sent: Wednesday, April 03, 2024 12:27 PM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: [Sprinklerforum] Re: Standpipe Calculations Not sure if this would help, I had a similar Apartment (NFPA-13R) situation where the Architect specified an Automatic Standpipe system because there was a water supply issue. I come to find out that the project was at the very end of the local water purveyors district. The property next door was a different water purveyor with plenty of water. The A.H.J. & Consultant allowed me to use the flow from that hydrant (25' from property) and design as manual standpipe system (Saved the cost of Fire Pump and Water Tank). I had to indicate proper signage on FDC. Maybe your property is same situation? George Medina Jr. Sr. Fire Sprinkler Designer SINGLETON FIRE PROTECTION INC. Office: (818) 252-5744 Cell: (323) 906-5701 Business Hours: 9:00am-5:00pm On Wednesday, April 3, 2024 at 06:43:54 AM PDT, [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> wrote: 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<http://www.rimrockdesignservicesllc.com> _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to [email protected]<mailto:[email protected]>
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