Are you required to use concealed space sprinklers?
If it meets the NFPA definition of a room and the requirements of 11.2.3.3 are met, then you should be able to use it above a ceiling. Be sure of any fire resistance rating requirements. Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080 (tel:860-535-2080) (ofc) 860-554-7054 (tel:860-554-7054) (fax) 860-608-4559 (tel:860-608-4559) (cell) > > On Oct 7, 2020 at 7:59 PM, <Travis Mack via Sprinklerforum > (mailto:[email protected])> wrote: > > > > We have a project that was pre-engineered. It has several issues that we are > having to correct. One is something I haven’t considered. We have a concealed > combustible space that requires 130 sq ft max spacing. The pendents are 225 > sq ft max spacing. All of the walls for the office spaces – think medical > office type project – are full height to deck and drywalled. Is there any > reason you wouldn’t use the small room method for determining area per > sprinkler for the SSU in the concealed space? For example, the room may be > 120 sq ft for example. However, the SSU located by the FPE is 6’ off the > north wall and 6’ off the west wall. Using SxL, this would be 144 sq ft per > sprinkler. But, if the space above the ceiling could be treated as a small > room, then the area per sprinkler could be the room area divided by the > number of sprinklers in the room. This would mean the sprinkler is 120 sq ft > per sprinkler. This happens in several places. There are many instances where > I can just move the sprinkler to be more centered and solve the problem, but > not all areas. So, would you consider that space above the ceiling to be > allowed to follow small room rules? Travis Mack, CFPS, CWBSP, RME-G, SET > Engineering Manager MFP Design 3356 E Vallejo Ct Gilbert, AZ 85298 NEW > EXTENSION: 480-505-9271 ext. 700 NEW MOBILE: 480-272-2471 > [email protected] www.mfpdesign.com Send large files to us via: > https://www.hightail.com/u/MFPDesign LinkedIn: > https://www.linkedin.com/in/travismack “The bitterness of poor quality > remains long after the sweetness of low price is forgotten.” Need/Want a > faster way to check material pricing? Build a material quote? Check > availability ? Searching for an invoice? *If you do not already have an > account with ferguson.com, click here to register.* **Have a Ferguson > account? Download the Ferguson app for on-the-go access to your favorite > ferguson.com features. Apple iOS devices or Android devices** > _______________________________________________ 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
