Where exactly is a remote area for a fire sprinkler hydraulic calculation drawn with respect to interior and exterior walls?
Is the remote area boundary along the inside, centerline, or outside edge of a wall?
Also, are small wall cavities or unsprinklered shafts right in the middle of a remote area included in that remote area square-footage?
I recognize that as much as I can fine-tooth a layout this really doesn't matter much in the overall scheme - and I typically would add a sprinkler or two to a calculation if the exact location of the remote area boundary would make or break an area threshold - but I've been curious about this as I'd like to be consistent with code and what should be done.
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11/16/2020 08:13:40 am
I have approached this by the floor area covered (the same approach for sprinkler spacing which defines actual minimum density required per sprinkler in most scenarios). This would provide me with floor layouts to the interior face of walls however my layout will include the full width of any walls or shafts that falls within the hydraulically most remote area (HMRA).
11/16/2020 11:15:29 am
As Dan indicated (always good comments :), you have to determine first your floor area (with the 1.2 rule to determine the length and the width of your area).
11/16/2020 11:23:04 am
Regarding the small unsprinklered areas within your sprinkler area, this is not a concern as long as they are limited in area.
I'm at work
11/16/2020 04:59:34 pm
I always value you guys' comments. I am also of the school that if it is Density/Area, not Room Design Method, then you ignore the walls. While I wish NFPA #13 would come out and say that, if it wanted you to follow walls, it would tell you so. I have seen support of this through industry informal interpretations and articles, including those written by Ken Isman and Victoria Valentine.
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