8.4.5.3 could be read to open that door. So you may be using ESFR for part of the room since it has a fast response element? The question still remains, what is the SINGLE design basis for the compartment? The Room Design is just a Spray sprinkler option (except where specifically allowed such as 13R for garages). In other words, many would say you are outside the guidance of NFPA 13 so now you are providing engineering services and developing an equivalency.
The mfg cut sheet sends you to the combined approach and since attics are just a pain, I'm going to leave that sleeping dog alone. Combining K-factors is common practice and from a design perspective, what problems would that cause? I'd stick with your final conclusion of not doing it. Roland On Apr 27, 2010, at 8:03 PM, A.P.Silva wrote: > That is what I thought. But NFPA 13, 2007, 8.4.5.3 and the associated > commentary seems to permit mixing of "bulb type, solder type, > residential or > other types", provided they are all "fast response". Or, am I > reading it > different? > > As for the design, can't you do a small room design with minimum 4 > heads to > combine the design criteria for both QR and RES heads? > > We do mix heads with different design basis, such as attic heads and > standard heads. I know different k factors in the same design area > causes > problems, but we do mix them. > > I will be asking the designer to not mix heads in the same > compartment, but > presently, preparing for questions that's bound to arise. > > Tony > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Roland > Huggins > Sent: April 27, 2010 2:18 PM > To: [email protected] > Subject: Re: Mixing residential/qr heads > > Unless explicitly allowed, such as QR in mechanical closet, you can > NOT > mixing different types of sprinklers in one compartment. What would > be your > method for combining the different design basis for each type of > sprinkler? > > Roland > > On Apr 26, 2010, at 9:40 PM, A.P.Silva wrote: > >> Reviewing a drawing where the designer has both residential and quick >> response heads in a dwelling unit. A res head is installed where the >> coverage is required to be EC. In other areas non-residential QR >> sprinklers. >> First, I don't think there's a problem mixing heads. Is that correct? >> Second, can room design method be used, provided minimum 4 heads are >> calcd.? >> >> Tony >> >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum >> >> For Technical Assistance, send an email to: [email protected] >> >> To Unsubscribe, send an email >> to:[email protected] >> (Put the word unsubscribe in the subject field) >> > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
