Agreed, 1000 gpm max for a sprinklered building. Interestingly, (or maybe not), here in Seattle we have a local ammendment to NFPA that requires at least one standpipe riser to have two 2 * in connections, but we don't even require the standpipe flow test at this point.
And as I read the 2007 NFPA 14 it too appears to require two 2 * in. connections. Section 7.3.2 requires one connection at the top of each riser and 7.3.2.2 requires an additional connection at the hydraulic end of the system. Oddly enough we do not even require more than one riser to have roof connections if the roof can be reached from the hose connection with 200 ft. of hose. A horizontal standpipe (think marinas) is typically designed for 1000 gpm in my experience. And really that is not enough for a covered moorage type of fire in reality. Rich Richardson Seattle Fire Department The foregoing is the opinion of the writer alone, and does not necessarily represent the intent of the NFPA 14 Technical Committee, nor constitute a formal or informal interpretation of the standard. >>> "Steve Leyton" <[EMAIL PROTECTED]> 02/07/07 8:13 AM >>> Leyton just got into office - West Coast representin'! Yes, I think it's intended that there be two FHV's available for testing at an approved location - ideally the most remote (usually top) of one or more standpipes. Our practice is to furnish a two-way manifold at the top of all Class I standpipes, whether they are within a stair enclosure or free-standing on the roof. WRT to the horizontal standpipe issue, I'm not sure and I think it's a great question. On the one hand, the 1000 GPM cap on sprinklered buildings rightfully presumes that there will be a controlled fire scene and hose streams will be secondary and mop-up. On the other hand, a horizontal standpipe is a completely different hydraulic model (at each floor) than if you took water from each of three FHV's that were independently supplied by two or three different risers. If you put a gun to my head, I'd say 1000 GPM cap on all sprinklered buildings, period. Rich? Steve Leyton Protection Design & Consulting The foregoing is the opinion of the writer alone, and does not necessarily represent the intent of the NFPA 14 Technical Committee, nor constitute a formal or informal interpretation of the standard. -----Original Message----- From: Ron Greenman [mailto:[EMAIL PROTECTED] Sent: Wednesday, February 07, 2007 7:28 AM To: [email protected] Subject: Re: More NFPA 14 - 2003: Max Flow Horiz SP Sounds like 750 to me if a single pipe and up to 1250 on any common runs to multiple pipes. What's Leyton say? On 2/7/07, Fletcher, Ron <[EMAIL PROTECTED]> wrote: > In a fully sprinklered one story building what is the maximum flow for a > single Class I horizontal standpipe system with more than three (30 > actual) connections? 750 gpm, 1000 gpm or 1250 gpm. > > 7.10.1.1.3 The minimum flow rate for additional standpipes shall be 946 > L/min (250 gpm) per standpipe, with the total not to exceed 4731 L/min > (1250 gpm) or 3785 L/min (1000 gpm) for buildings sprinklered > throughout. > > 7.10.1.2.2 Where a horizontal standpipe on a Class I and Class III > system supplies three or more hose connections on any floor, hydraulic > calculations and pipe sizes for each standpipe shall be based on > providing 946 L/min (250 gpm) at the three hydraulically most remote > hose connections on the standpipe and at the topmost outlet of each of > the other standpipes at the minimum residual pressure required by > Section 7.8 > > 7.10.1.2.3 Common supply piping shall be calculated and sized to provide > the required flow rate for all standpipes connected to such supply > piping, with the total not to exceed 4731 L/min (1250 gpm). > > Ron Fletcher > Aero Automatic Sprinkler > Phoenix, AZ > > Aero Automatic Sprinkler > > PHoenix, AZ > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > -- Ron Greenman at home.... _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
