*3.7.1* Obstructed Construction. *Panel construction and other construction where beams, trusses, or other members impede
heat flow or water distribution in a manner that materially affects the ability of sprinklers to control or suppress a fire. *A.3.7.1 Obstructed Construction. *The following are examples of obstructed construction. The definitions are provided to assist the user in determining the type of construction feature. (1) *Beam and Girder Construction*. The term *beam and girder construction* as used in this standard includes noncombustible and combustible roof or floor decks supported by wood beams of 4 in. (102 mm) or greater nominal thickness or concrete or steel beams spaced 3 ft to 71⁄2 ft (0.9mto 2.3 m) on center and either supported on or framed into girders. [Where supporting a wood plank deck, this includes semimill and panel construction, and where supporting (with steel framing) gypsum plank, steel deck, concrete, tile, or similar material, this includes much of the so-called noncombustible construction.] *8.8.4.1.2 Obstructed Construction. *Under obstructed construction, the sprinkler deflector shall be located in accordance with one of the following arrangements: (3) Installed in each bay of obstructed construction, with the deflectors located a minimum of 1 in. (25.4 mm) and a maximum of 12 in. (305 mm) below the ceiling. R/ Matt On Tue, Jul 15, 2014 at 10:24 AM, Fairchild, Jack < [email protected]> wrote: > What's the true time duration of this sim? > > Jack Fairchild > > > > -----Original Message----- > From: Sprinklerforum [mailto: > [email protected]] On Behalf Of Brad > Casterline > Sent: Tuesday, July 15, 2014 10:13 AM > To: [email protected] > Subject: RE: ECOH 20x20 OH1 Obstructed Construction > > Max would be 22" (16" deep beam + 6"). Minimum would be 13" because If I > looked at 13 right at 3'9 from the beam the deflector can be max 3" above > the bottom. > .2m cell is how 'fine' the calculation domain is, .1*3.28=4", so I can > only 'resolve' to an accuracy of 4" increments. I first set this up using > .05m cells so I could look at activation time for 286F Standard Response at > 22", but that calc was taking several days to complete and I lost patience. > Just because we CAN be 22" down in this situation, doesn't mean we should > :). > I think it is always best to be as high as possible without the flow being > obstructed because not only is the activation faster, the pattern hits > higher up, like on a couch against a wall! > Brad > > -----Original Message----- > From: Matthew Willis [mailto:[email protected]] > Sent: Tuesday, July 15, 2014 8:57 AM > To: [email protected] > Subject: Re: ECOH 20x20 OH1 Obstructed Construction > > *Published on Jul 15, 2014* > > 20x20x10 room. ECOH sprinkler centered. 16" steel I beams 3'-9" from > center. Max deflector is 22", and Min is 3" above bottom of beams= 13" , > but deflector distance is closer to 12" due to .2m cell size. OH1 figured > here, 400 x.15=60 GPM, K=11.2. > Activation time difference between min and max deflector distance is not > part of this movie- instead, the sim is to show suppression time for the > flow rate if the head activated when the heat release rate is 2750 kW. > Wall Temperature and Water Drop Temperature are displayed. > I used E_COEFFICIENT=2. > > > Correction-- .1m cells, so deflector distance can be 12", 16", 20", or 24". > Walls and ceiling are gyp. bd., floor is carpet. Doors are 3x7. > K=11.2? > > > > I might be looking incorrectly, but in your heading you state obstructed > construction. This allows 17" - 22" from deck. Your second comments state > between cells and you list 12, 16, 20, and 24. Doesn't cell spacing not > limit us to 1-12" > > > R/ > > Matt > > > > > On Tue, Jul 15, 2014 at 9:11 AM, Brad Casterline <[email protected]> > wrote: > > > https://www.youtube.com/watch?v=B-Gj7V3hCyM&feature=youtu.be > > > > > > > > Movie anyone? > > > > > > > > Brad Casterline, NICET IV > > > > Fire Protection Division > > > > > > > > FSC, Inc. > > > > P: 913-722-3473 > > > > [email protected] > > > > www.fsc-inc.com > > > > > > > > Engineering Solutions for the Built Environment > > > > > > > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > > > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
