It was pointed out to me off forum the literature cleary shows back to back cannot be used when the channels are running end to end.
(Thanks again Ed).
So, should the same '8 foot rule' be applied for parallel to the slope when the channels run end to end?

Thanks,
Brad

Quoting bcasterl...@fsc-inc.com:

I was glancing through the literature of one of the Specialty Attic Sprinkler makers (back-back at the peak) and none of the plan views shows which way the channels were running so the delay in activation for the rare case of channels running end to end can be neglected, apparently. The Fire always goes up fast enough and if that's good enough for attic sprks it should be good enough for SSU.

Brad

Quoting bcasterl...@fsc-inc.com:

That paints a perfect motion picture Roland.
So we space for 8ft end to end, not eave to peak.
On the off chance the channels run end to end it might be a good idea to go 8 eave to peak too? I've modeled attic type head discharge patterns but it never occurred to me to try and gain a better understanding of the 8ft thing by modelling activation, and now thanks to you I don't have to...
Gee thanks Roland,
Brad

Quoting Roland Huggins <rhugg...@firesprinkler.org>:

Just the opposite but your reasoning when viewed a little differently will help lock it down. The fire goes up the slope and does not spread out in the normal circle. This results in the adjacent sprinklers (from the channel with the heat) seeing much less of the heat. SO if they are closer to the channel (represented by a spacing of 8 ft) then a normal pressure but if further apart (longer activation time) then a higher pressure .

Roland

Roland Huggins, PE - Senior VP Engineering
American Fire Sprinkler Assn.
Dallas, TX
http://www.firesprinkler.org <http://www.firesprinkler.org/>

Fire Sprinklers Saves Lives




On Apr 17, 2018, at 11:28 AM, Jeff Normand <jeff.norm...@gmail.com> wrote:

I agree that wording confuses me also. Perpendicular to slope. Been too long since I've dealt with this and I have to look it up each time. But I'm thinking it makes sense that the spacing would be up the slope - fire goes up the slope - so no more than 8 feet apart up the slope.



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