Are we still talking about a residential occupancy? Lamar Vaughn Vaughn & Company
---- Damien Shannon <qedsprinkl...@usa.com> wrote: > My understanding would be: > NFPA 13, 2007, 11.2.3.3.5 (2) would allow 8' wide with a 8" lintel for light > hazard Room design to be considered an unprotected opening. i.e. you could > still use room design but would have to calc your 'design room' and 2 > sprinklers in each of the communicating spaces (that have unprotected > openings). If the door into the other room on the 3rd floor could be > considered 'Non-rated automatic or self closing doors' as stated in NFPA 13, > 2007 section 11.2.3.3.5 (1), had your 8" lintel opening (opening restricted > to 8' wide), you could calc the sprinklers in the design room and 2 > sprinklers from the floor below floor. > Alternatively, since it seems you have water supply to be considering the > additional sprinklers required for the communicating spaces with the room > design, if you were doing .1/1500 design, would the required area of > operation not be limited to a given floor and would that extra room on the > 3rd floor have more than 2 sprinklers? If the 2nd room on the 3rd floor has > only 2 sprinklers (depending on spacing/flow requirements), it may be > comparitable to the room design you may be able to justify the calc without > your friend installing auto closing doors, lintel and reducing the 12' > opening. > A lot of ifs for you. > > Damien Shannon. > > > > -----Original Message----- > From: sprinklerforum-boun...@firesprinkler.org > [mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of George Medina > Jr > Sent: Thursday, July 16, 2009 10:26 PM > To: SprinklerFORUM@firesprinkler.org > Cc: msingletonf...@sbcglobal.net > Subject: Room design method - Technical information > > ?I am trying to help a contractor friend with a residential fire sprinkler > system originally designed per NFPA-13D using Tyco 'LF-II' 4.9K. > His client has areas where the beams are spaced less than 3'-6" and are 8" > in Depth . He can not ( or does not) want to change the beam depth or > spacing if possible so I inquired with the local AHJ about changing it to a > regular NFPA-13 system and using the room design method (so as to use quick > response heads near the bottom of the beams). I got the ok for that part, > but the room configuration doesn't quite fit the code configuration. The > most remote and demanding area is a third floor room (loft?) which has two > compartments one being opened to the 2nd floor below. By reading the section > on 'Room Design Method' it appears the main concern is keeping the heat in 1 > room long enough to activate all the heads in it and possibly 1 or 2 heads > near the unprotected opening. It appears that it would meet all other > aspects of the code but the only difference being that the high room area > has a 12' wide opening on the 2nd floor to an adjoin room (10' below the > high ceiling). Is there a > ny research data on the 'Room Design Method' where the mathematics and > science required the 8" lintel and/or 8' maximum width of unprotected > opening? Any suggestions? (besides walking away from it). > > > > George Medina Jr. > Sr. Fire Sprinkler Designer > 95-1015 Ka'apeha Pl. > Mililani, HI 96819 > > > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: techsupp...@firesprinkler.org > > To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org > (Put the word unsubscribe in the subject field) > > __________ Information from ESET Smart Security, version of virus signature > database 4252 (20090717) __________ > > The message was checked by ESET Smart Security. > > http://www.eset.com > > > > > __________ Information from ESET Smart Security, version of virus signature > database 4252 (20090717) __________ > > The message was checked by ESET Smart Security. > > http://www.eset.com > > > > __________ Information from ESET Smart Security, version of virus signature > database 4252 (20090717) __________ > > The message was checked by ESET Smart Security. > > http://www.eset.com > > > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: techsupp...@firesprinkler.org > > To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org > (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: techsupp...@firesprinkler.org To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org (Put the word unsubscribe in the subject field)
