Maybe I'm missing something here. This is a full NFPA 13 and it would be considered a Light Hazard occupancy. It is fed from a dry system so you would design the system based on a 1950 sqft area. QR sprinklers are also required in all Light Hazard occupancies. What is the issue?
You said "It is my understanding that sprinklers in an elderly housing assisted living apartment facility is primarily life safety." Why? Is there some Code issue that is driving this? Life safety is an obvious part of what we do, but in a full NFPA 13 system, property protection is added in as well. NFPA 13R (and 13D) are primarily life safety standards, but 13 is the full monty. Is there some evidence out there that the delay caused by dry systems is having impact on life safety? Remember life safety systems typically discharge at 0.05 gpm/sqft and LH systems at 0.10 gpm/sqft. That is a lot more water out of an LH system. Could not the additional water make up for the delay due to evacuating the air? Of course the question I've had is if a sprinkler on a dry system activates relatively close to the fire, does the rush of air from the sprinkler actually make the fire more intense? At 04:13 PM 3/30/2009, you wrote: >The residential units are supplied from a dry system located in the attic. >That was the whole basis for my question. I felt the dry system would take >too long to get water to the sprinklers in the residential units. Thanks for >your input. > >Arthur Tiroly >ATCO Fire Protection Design >Tiroly and Associates >3300 King Ave >Cleveland, OH 44114 >216-621-8899 >216-570-7030 cell > >-----Original Message----- >From: [email protected] >[mailto:[email protected]] On Behalf Of Dave >Sent: Monday, March 30, 2009 1:29 PM >To: Sprinkler Forum >Subject: RE: RESIDENTIAL OCCOPANCY DRY SYSTEM > >Im not sure but are we saying that the dry system also supplies the heads IN >the top floor dwelling / client rooms ??? > >There is currently no listed residential sprinkler for dry systems nor the >DPV .... the use of dry systems in 13 for residential occupancies requires >water delivery time of 15 seconds ..... The NFPA 13 committee put in the >permission to do dry residential systems but with the 15 seconds ahead of >any such equipment being made just in case it came out before the next >cycle. During a test burn we intentionally left water off for one minute >past the head fusing just to see .... it didnt go well and the room was >beyond the permissible tenability standards of UL1626 prior to suppression. >In other words ..... you can do it currently - maybe someday in the future. > >The attic alone could be a dry system under the rules but if they also drop >into the living space we have a problem. > >Dave P. >An AHJ in NJ >_______________________________________________ >Sprinklerforum mailing list >http://lists.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 >http://lists.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) Todd G. Williams, PE Fire Protection Design/Consulting Stonington, Connecticut www.fpdc.com 860.535.2080 _______________________________________________ Sprinklerforum mailing list http://lists.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)
