The AHJ wants additional protection, to mitigate fire spread from the interior toward exterior stairs in proximity to the affected openings. The building code allows for protection of openings in a fully sprinklered building by use of a water curtain per 903.3.1.1, i.e. NFPA 13. We're going to cobble together the discharge criteria and placement of a sprinkler over the interior side of each panel and call it a day. I don't write the copy, just reading the news into the camera.
Steve Leyton Protection Design & Consulting San Diego, CA -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Mike Hairfield Sent: Thursday, July 15, 2010 12:22 PM To: AFSA SprinklerFORUM Subject: RE: Small Orifice Sprinklers in Water Curtain Shouldn't you be looking at Exposure Protection Sprinkler Systems which allows different K factors? Mike > Subject: Small Orifice Sprinklers in Water Curtain > Date: Thu, 15 Jul 2010 12:12:11 -0700 > From: [email protected] > To: [email protected] > > Scenario: 3-story Light Hazard (Residential) occupancy, > fully sprinklered per 13. > > Situation: Exterior exit stairs are too close to glazed > openings in exterior walls and 45-minute window protection is required > (from inside out) for several 2'x3' fixed windows on all three floors. > > Challenge: Can't use window sprinklers because exterior walls > are bearing. Am proposing to use water curtain provisions of the > building code, and furnish 3 GPM per lineal foot per 13. > > > > Question: Since the windows are only 2' wide, and there are > up to 3 windows in a cluster, we will have sprinklers at 4' apart in > several areas and will be provided a baffle of some sort. I can > easily hit my minimum flow rate with small orifice sprinklers and do not > see any restriction in 13 regarding orifice size in a water curtain. > Since it's all Light Hazard, can anyone think of a reason why we can't > use 4.2K pendents? > > > > Steve Leyton > > PROTECTION DESIGN & CONSULTING > > 2851 Camino del Rio South, Suite 400 > > San Diego, CA 92108 > > ------------------------------------------------------------- > > Ph: 858.751.2930 - ext. 102 > > Fax: 858.751.2933 > > Cell: 619.972.5696 > > > > > > > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) __________ Information from ESET NOD32 Antivirus, version of virus signature database 5282 (20100715) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 5282 (20100715) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
