Greg, If I were doing the design, I would use the 6-12 criteria. I believe that the additional water requirement is due to the delay in activation due to the increased deflector distance (or so I was told). I think you would have the same situation in that case.
For #2, the section in 13 requires that the "hydraulically most remote 4 sprinklers" be calculated. I would make sure your design meets that criteria. Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT www.fpdc.com 860-535-2080 (ofc) > On Dec 22, 2014, at 8:12 PM, Greg McGahan <[email protected]> wrote: > > Help please.... > > Situation in a NFPA 13 hotel...: > > There is a 1'-0" wide soffit by 4" deep adjacent to a restroom wall. If I > place res sidewall 4" under soffit the deflector would then be 8" below > the higher ceiling past the 1'-0" soffit. > > Although I am very conservative with calcs in general - this one hurts the > pipe sizes bigtime so I am asking if my conservative approach is > technically correct or overkill: > > Question #1 - Do I have to calculate the head for the 6"-12" distance below > the ceiling or can I use the 4"-6" range? > > > Question #2 - When you do a 4 head Res calc in a 13 building, do you define > "adjacent" by linear distance or do you purposely go for the sidewall in > the next room even if it is further away in order to be conservative? IW - > the nearest pendent in the next room is 4' away, going the other direction, > the sidewall in the next room is 10' away.V's are sidewalls and + are > pendents....thats as close as I can get at this hour. > > I I I V I > V > I I I I > I + I + I + I > + > I I I I > > > Greg McGahan > Living Water Fire Protection, LLC <http://www.livingwaterfp.com> > 1160 McKenzie Road > Cantonment, FL 32533 > 850-937-1850 > fax 850-937-1852 > _______________________________________________ > 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
