Cecil,
Globe Sprinkler has been doing a lot of research on this as part of their new attic sprinkler line. SFPE did a webinar on this recently. They had some great video and current research on this topic. Check them out. Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080 (ofc) 860-553-3553 (fax) 860-608-4559 (cell) > > On Apr 23, 2018 at 5:21 PM, <Sprinkler Academy - C Bilbo > (mailto:prodesigngr...@msn.com)> wrote: > > > > > > Yo Everybody! Been a while, but here goes nuthin'.... > > > > > > > > > In the Mid-90's, Central Sprinkler Company in Lansdale, Pa did some > research as part of developing the Attic Sprinklers. We needed a base for > meeting a standard of performance to see if the attic sprinklers could do > what sprinklers should do; Control the Fire. So an entire roof top > structure was built in a parking lot to see how standard spray sprinklers > performed. Well.... let's just say that the experiment had to be stopped > before the whole thing burnt to the ground. > > > > > > > > > We were delighted (I say we.... I was over in the SprinkCAD division at the > time) anyway, the research guys were happy to see that the attic sprinklers > did what they were supposed to do. They accomplished control. They had to > be spaced at 6' because any more than 30' of throw and the sprinklers would > exceed the 400 sq ft max from NFPA 13. It worked!! > > > > > > > > > So with that line of thinking, if we ran standard spray sprinklers up the > slope no more than 15' apart AND we limited the opposite direction to 8' in > between channels for each set of trusses (120 sq ft)..... that would > work. The heat being guided up the channels created by the trusses could > successfully activate the standard spray sprinklers. > > > > > > > > > There's a whole bunch more to the story, but that gives a basic idea of where > we were coming from as a committee. > > > > > > > > > Now...... this was all based on a true story from 25 years ago..... the only > guy I know that could sharpen/change the details would be the guy that set up > and participated in those test, Mark Fessenden. > > > > > > > > It should be recognized that the above is my opinion as a member of the NFPA, > and has not been processed as a formal interpretation in accordance with the > NFPA Regulations Governing Committee Projects and should therefore not be > considered, nor relied upon, as the official position of the the NFPA, nor > any of their technical committees. > > Sincerely, > > > Cecil Bilbo, president > Academy of Fire Sprinkler Technology > New Classes All the Time (http://sprinkleracademy.com/design_course/) > Champaign, IL > 217.607.0325 > www.sprinkleracademy.com (http://www.sprinkleracademy.com) > ce...@sprinkleracademy.com (mailto:ce...@sprinkleracademy.com) > OUR STUDENTS SAVE LIVES!! > > > > > > From: Sprinklerforum <sprinklerforum-boun...@lists.firesprinkler.org> on > behalf of bcasterl...@fsc-inc.com <bcasterl...@fsc-inc.com> > Sent: Monday, April 23, 2018 3:26 PM > To: sprinklerforum@lists.firesprinkler.org > Subject: Re: Perpendicular to Slope / Attic > > > > > Thanks for reply Todd. > If somebody asked me, "should the 8' rule be applied for parallel to > the slope when the channels run end to end" I would have to say, "no, > because the book don't tell me so". > I gotta be able to cite numbers to myself though so I'll know in about > a week whether or not I think the book should say apply it. > > Brad > > Quoting Fpdcdesign <fpdcdes...@gmail.com>: > > > SFPE hosted a webinar yesterday on Globe’s new attic protection > > scheme. They had some great video that explained a lot of what is > > being talked about here. > > > > > > > > Todd G Williams, PE > > Fire Protection Design/Consulting > > > > Stonington, CT > > > > 860-535-2080 (ofc) > > > > 860-553-3553 (fax) > > > > 860-608-4559 (cell) > > > > > > > > > > > > > > > >> > >> On Apr 20, 2018 at 3:19 AM, <Bcasterline > >> (mailto:bcasterl...@fsc-inc.com)> wrote: > >> > >> > >> > >> 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. > >> >> > >> >> > >> >> > >> >> _______________________________________________ > >> >> Sprinklerforum mailing list > >> >> Sprinklerforum@lists.firesprinkler.org > >> >> > >> > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > >> > > >> > > >> > > >> > _______________________________________________ > >> > Sprinklerforum mailing list > >> > Sprinklerforum@lists.firesprinkler.org > >> > > >> > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > >> > >> > >> > >> _______________________________________________ > >> Sprinklerforum mailing list > >> Sprinklerforum@lists.firesprinkler.org > >> > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > >> > > > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > _______________________________________________ Sprinklerforum > mailing list Sprinklerforum@lists.firesprinkler.org > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >
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