The general requirements for standpipes are code-driven, such as when and where they are required. Unless there's a city ordinance that specifically calls out what to do in this situation, the building and fire codes basically state that if you have a change in use or occupancy of a building that it must be brought to current code, but if it has been continuously used and occupied since it was originally built, the existing systems must be maintained but not necessarily upgraded.
What I'm saying is that if the AHJ requires an upgrade, you'll need an automatic water supply. But if it's just a sprinkler retrofit, you can fall back on the sections in 14 that Roland and others have referenced. It would be a good idea in that case to do a single path calc' from the FDC (or FDC's if you upgrade to a pair as required under the current standard) based on the inlet flow and pressure given to you by the fire department. It would be a good CYA to let everyone know up front how much pressure you can actually deliver to the roof through those old, presumably Sch. 40 risers ... 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: Roland Huggins [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 31, 2007 7:58 AM To: [email protected] Subject: Re: NFPA #14 and pressures & pump You know you can NOT look at just ONE section of the standard. Since it is a high-rise, 14:5.4.1.1 is the criteria that drives this boat. The issue on 5.4.1.3 attempts (and badly I might add) to address using a combined standpipe. The way it is written here IMPLIES that you can have a combined sprinkler/standpipe with an automatic sprinkler supply but a manual standpipe supply ONLY in a retro-fit. It applies to new buildings too as clearly indicated in the latest edition. Roland On Jan 31, 2007, at 6:43 AM, art wrote: > We have a 100 ft high rise residential bldg. with major > renovations. There > are two existing 4" standpipes. The building will be retrofitted > with a > sprinkler system per NFPA 13. From NFPA 14 2003,can 5.4.1.3 be used > to not > require a fire pump to supply the standpipe 100 psi pressure since > this > existing 80 year old bldg is being sprinklered? Is the fire pump > required to > supply 750 gpm with 500 gpm at 100psi at the most remote standpipe? > Art Tiroly > ATCO Fire Protection > > > Roland Huggins wrote > excellent question. I put my money on Steve's answer. The NFPA > committees that I am on (or familiar with) are aggressively moving > away from encouraging occupants to use a hose (which correlates > nicely with OSHA requirements). > > Roland > > On Jan 30, 2007, at 1:02 PM, Steve Leyton wrote: > >> I think that the sections I referenced are quite clear: >> >> "For Class III systems installed without hose, the water supply >> requirements shall be as specified for Class I systems." >> >> That would be ALL of the water supply design criteria, including >> both maximum and minimum pressures. >> >> 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. >> >> > > _______________________________________________ > 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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
