I recently learned that the beam only acts like a wall if you can't
throw under it, so get those deflectors way up there!
(Crow and Thunderbird rocks)
Merry Christmas Forum,
Brad.
Quoting Bob <[email protected]>:
The beam is an obstruction that acts like a wall. You’re 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, 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
Fax 604-888-4732
Cel 604-790-0938
Email [email protected]
Web www.phaserfire.ca
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