Is this stair supposed to be a protected exit? Like normally in a rated shaft but now exposed due to glazing on one side? So question is whether you're trying to emulate a certain fire resistance rating with these window sprinklers or just providing some sort of exposure protection?
Craig L. Prahl, CET Fire Protection Specialist Mechanical Department CH2MHILL Lockwood Greene 1500 International Drive Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 [email protected] http://www.ch2m.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Steve Leyton Sent: Thursday, July 15, 2010 3:36 PM To: [email protected] Subject: RE: Small Orifice Sprinklers in Water Curtain 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) _______________________________________________ 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)
