Thanks Todd. Another idea is to 'close off' the sides. It would then be similar to a Platform (as opposed to a stage) and with only 8" clear space storage would not be possible.
-----Original Message----- From: Todd Williams [mailto:[email protected]] Sent: Friday, December 13, 2013 9:09 AM To: [email protected] Subject: Re: obstruction vs concealed space. Good thought, but you could end up with a shielded fire which the sprinklers at the ceiling may not be able to contain. EH2 addresses this type of fire to certain degree as does the 3000 sqft remote area requirement for adjacent areas I don't think the idle pallet comparison is viable because you don't have a solid top. Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080 www.fpdc.com > On Dec 13, 2013, at 8:54 AM, "Brad Casterline" <[email protected]> wrote: > > 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 _______________________________________________ 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
