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, 76 off the beam then 15 between the heads then 76 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 Fax 604-888-4732 Cel 604-790-0938 Email [email protected] Web www.phaserfire.ca
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