The beam is an obstruction that acts like a wall. Youre covering floor space, so as long as each sprinkler covers the correct area (30 sf), then the spacing that you are describing sounds in compliance with NFPA 13 spacing rules.
Thank you, Bob Knight, CET III 208-318-3057 From: Sprinklerforum [mailto:[email protected]] On Behalf Of James Crawford Sent: Thursday, December 21, 2017 3:00 PM To: [email protected] Subject: S & L Rule 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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