Todd, In thinking more about this, just a couple thoughts to throw out--
1)The combustible concealed spaces that pose a challenge are usually 'finish work' for architectural reasons up off the floor and hiding the structure. If a fire gets inside it can grow unnoticed and cause structural damage and pose a huge threat. A Table is not like that. 2) Imagine a stack of idle pallets as the fuel load, and the 1st one starts 16" off the floor somehow; we would not sprinkler under the 1st pallet- we would plan a water flow rate to control the fuel load. In the same way I see the combustible table itself as the fuel load, and not what very small ignition source might be under it. Of course, I cannot not cite any code sections other that the one that says something about providing "...a reasonable degree of protection...". Brad -----Original Message----- From: Todd - Work [mailto:[email protected]] Sent: Thursday, December 12, 2013 4:29 PM To: [email protected] Subject: Re: obstruction vs concealed space. Probably require concealed space sprinklers Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT www.fpdc.com 860-535-2080 (ofc) > On Dec 12, 2013, at 4:27 PM, "Brad Casterline" <[email protected]> wrote: > > WoW! If they are fixed in place and you have to sprinkler under you will > need about what, (12) heads/table, and baffles; with 6 or 8 inches from > bottom of framing to floor the floor is an obstruction to the pattern > developing for uniform density, unless the spacing is very close ;) . > Maybe some day the book will say unless the depth of the space exceeds max > deflector distance, heads are not required. You cold def use QR Reduction > though (if you use QR heads and wet pipe, but the fuel load itself will also > be an obstruction! > > never mind me though as usual-- i'm just geeking here > > -----Original Message----- > From: Johnson, Duane (NIH/OD/ORS) [C] [mailto:[email protected]] > Sent: Thursday, December 12, 2013 3:04 PM > To: [email protected] > Subject: RE: obstruction vs concealed space. > > 8.5.5.3.2 Sprinklers shall not be required under obstructions that are not > fixed in place, such as conference tables. > > 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: Todd - Work [mailto:[email protected]] > Sent: Thursday, December 12, 2013 4:02 PM > To: [email protected] > Subject: Re: obstruction vs concealed space. > > NFPA 13 (2002) section 8.5.5.3.1 and equivalent sections of subsequent > editions. > > Todd G Williams, PE _______________________________________________ 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
