And to add one last thought, the purpose of the on-site supply was to assure enough water for sprinklers - the code is written such that the capacity of the tank is to be adequate to meet sprinkler demand (and duration). However, here in Seismic World, I'm not aware of a single AHJ that hasn't codified an amendment that requires at least 30 minutes of standpipe water. In Los Angeles, they require standpipe demand x highest sprinkler hazard class duration, so if you have OH parking or retail you have to go 750 or 1000 x 60 minutes and you get some pretty big reservoirs.
Steve Leyton -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Johnson, Duane (NIH/OD/ORS) [C] Sent: Tuesday, August 13, 2013 5:55 AM To: [email protected] Subject: RE: High rise- non seismic zone - 2 water supplies? Section 403.3.2 requires a high rise with a fire pump to be connected to a minimum of two water mains. There is a performance based exception however. Section 903.3.5.2 requires an additional "on-site" water supply for new high rise buildings in seismic zones C, D, E or F. The "on-site" water supply is different from the water supply that is brought "to the site" (ie underground water main). There is an exception for existing buildings. The requirement is to increase reliability in the event of a seismic activity. Over to you Steve... Duane Johnson, PE Program Manager Division of the Fire Marshal (Contractor) Office of Research Services National Institutes of Health 301-496-0487 "Protecting Science - One Sprinkler at a Time" -----Original Message----- From: Martinez, Dewayne [mailto:[email protected]] Sent: Monday, August 12, 2013 5:57 PM To: [email protected] Subject: High rise- non seismic zone - 2 water supplies? IBC (09ed) sections 403 and 903 I have an existing un-sprinkled high rise building that now needs to be fully sprinkled per NFPA 13 (07ed) and will require a fire pump. I think it will require two sources of water supply but I just want to confirm. Section 403.3 requires a secondary water supply where required by 903.3.5.2. 903.3.5.2 requires 2 sources if I am in a seismic zone, which I am not, but 403.3.2 seems to trump this by requiring a second supply when a fire pump is installed. Am I interpreting this correctly? Thanks, Dewayne _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler .org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler .org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
