I see nothing wrong with that. The beam is your "protection line" or "wall". The heads are spaced properly in each area they are protecting. The heads protecting 5'-0 to the beam (10'-0) are spaced along the branch line properly for that coverage. And the heads throwing 7'-6 to the beam (15'-0) are spaced along the branch line properly for that coverage. The floor area is protected properly.
On Thu, Dec 21, 2017 at 4:00 PM, James Crawford <[email protected]> wrote: > We have been having a discussion in the office about the S&L rule for > spacing of sprinkler heads. We received a sprinkler drawing with some > spacing that we do not agree with, see below, but can find no specific > direction in NFPA #13 (2013) that says it is wrong. > > > > Basic situation we have a small building with a 20’ bay and a 30’ bay. > Ordinary hazard spacing. > > > > For the 20’ wide bay, we have2 lines spaced at 10’ apart , so we have 5’ > off the wall then 10’ between the next line and 5’ to the beam line, the > heads are spaced at 13’ along these lines. > > > > Then we have a 30’ bay where we have 2 lines spaced 15’ apart, 7’6 off > the beam then 15’ between the heads then 7’6 to the wall, heads are spaced > at 8’ along the line > > > > So our discussion is the sprinkler lines along the beam line which would > be 5’-0” plus 7’-6” for 12’-6” between the line. The sprinkler heads in the > 20’ bay are spaced at 13’-0”, so if we use the S&L rule these heads are > spaced at 12’-6” x 13’-0” or 162.6 ft². Is this correct? > > > > And yes I know we could space the 30’ bay with 3 lines at 10’ apart and > that is what I would do but it is not our design. > > > > Comments > > > > Thank you > > > > > > James Crawford > > Phaser Fire Protection Ltd. > > Phone 604-888-0318 <(604)%20888-0318> > > Fax 604-888-4732 <(604)%20888-4732> > > Cel 604-790-0938 <(604)%20790-0938> > > Email [email protected] > > Web www.phaserfire.ca > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler. > org > >
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