the different portions of the building have always been allowed to have an individual deign basis. IT does not require physical separation. That’s why there is criteria on adjacent designs.
Holes in the floor always adds an element of interest. For instance, individual floor areas in LH hazard have an allowed maximum of 52,000 sf. If you have an opening that is 5,000 sf, is that 5,000 sf assigned to the first or second floor? It’s obviously physically located on the first floor but since the intent of limiting the area of protected floor that can be shut-off at one floor valve, the 5000 sf is a second floor concern (assuming the sprinkler pipe is fed from the second floor). As for the water curtain, it is there to reduce the heat flowing from under the ceiling, into the open area and to the upper floor. As such, the fire that is under the open area is not the source of concern. It’s addressed by the sprinklers above it. The water curtain is included in the required dimension of the remote area for the design basis of the floor area beneath the lower ceiling. Ensuring everyone is singing from the same page is the challenge. Roland Roland Huggins, PE - VP Engineering American Fire Sprinkler Assn. --- Fire Sprinklers Saves Lives Dallas, TX http://www.firesprinkler.org On Apr 1, 2014, at 9:14 AM, Matt Grise <[email protected]> wrote: > Yes - building is a single occupancy hazard. > > So the area next to the opening and the area under the opening could be > considered separate? I was concerned that it might be considered one area > with a ceiling that varies in height. The opening is less than 1500 sf. So > any 1500 sf operating area that included the opening would also include areas > outside of the opening. > > Matt Grisé PE*, LEED AP, NICET II > Sales Engineer > Alliance Fire Protection > 130 w 9th Ave. > North Kansas City, MO 64116 > > *Licensed in KS & MO > > 913.888.0647 ph > 913.888.0618 f > 913.927.0222 cell > www. AFPsprink.com > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Roland > Huggins > Sent: Tuesday, April 01, 2014 11:07 AM > To: [email protected] > Subject: Re: quick response area reduction with vertical openings > > I would say yes and no. It all depends on your selection of a design basis. > The area below the opening has a tall ceiling so that PORTION of the building > has a design basis that is not reduced. The remainder of the building can > use its own design basis that includes the reduction or follow the other. > Naturally we are assuming the entire building is a single occupancy hazard > classification. > > Roland > > Roland Huggins, PE - VP Engineering > American Fire Sprinkler Assn. --- Fire Sprinklers Saves Lives > Dallas, TX > http://www.firesprinkler.org > > > > > > On Apr 1, 2014, at 8:33 AM, Matt Grise <[email protected]> wrote: > >> I am looking at a building that has 12' ceilings (per floor). In one area >> there is a vertical opening to the second floor that is protected with >> closely spaced sprinklers and draft stops. Is it still acceptable to use the >> quick response area reduction or does the opening to the second floor count >> as a ceiling in excess of 20'? >> >> If it is acceptable to use the quick response reduction, can you apply the >> reduction to the length of closely spaced sprinkler heads that must be >> calc'd? >> >> Matt Grisé PE*, LEED AP, NICET II >> Sales Engineer >> Alliance Fire Protection >> 130 w 9th Ave. >> North Kansas City, MO 64116 >> >> *Licensed in KS & MO >> >> 913.888.0647 ph >> 913.888.0618 f >> 913.927.0222 cell >> www. AFPsprink.com >> >> >> _______________________________________________ >> 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
