The 4 "worst" heads regardless of location. Usually 4 heads on one branch line...
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ryan Peterson Sent: Friday, January 25, 2008 8:29 AM To: [email protected] Subject: RE: residential heads / 4 head calc Remember if you use the room design method you have to prove that the walls will provide a 30 minute fire resistance rating. The walls I've looked at inside a dwelling unit are shown as non-rated partitions as well as the doors. Ryan Peterson Wayne Automatic Fire Sprinklers -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Friday, January 25, 2008 11:07 AM To: [email protected] Subject: RE: residential heads / 4 head calc Sorry to jump into this late, especially if this has already been resolved. It is NOT permissiable to utilize the room design method with residential sprinklers. The use of residential sprinklers and the hydraulic design approach are found under special design approaches in 11.3 The room design method is found under 11.2. You cannot cross pollinate your approach. The section numbers are as segregated as chapters. This is an error we see commonly but it is absolutely incorrect. If you want to use the room design method in a residential occupancy under NFPA 13, you have to use QR sprinklers. If you use residential sprinklers, you have to follow 11.3 have a nice day. Bob Caputo ---- Greg McGahan <[EMAIL PROTECTED]> wrote: > Well, that is my point. Since the density is now .10 in order > compensate for the difference in property protection vs life safety > protection, I can not understand the difference in the stipulation > between residential and QR in this case. > > In addition; 11.3.1 does not say "rooms" it says "compartments". A > compartment does not have to have ANY fire resistance and can have > openings, while a room "shall be enclosed with walls having a > fire-resistance rating equal to the water supply duration indicated in > Table 11.2.3.1.2". I feel that this is a significant difference and > therefore you should be able to use the room design method in this case. > > Thank you, > Greg McGahan > > Living Water Fire Protection, LLC > 1160 McKenzie Road > Cantonment, FL 32533 > 850-937-1850 > Fax: 850-937-1852 > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Dewayne > Martinez > Sent: Friday, January 25, 2008 6:21 AM > To: [email protected] > Subject: RE: residential heads / 4 head calc > > Perhaps because you use the actual area of the residential sprinkler, > not the listed area, in the calculation process? > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Ed > Kramer > Sent: Thursday, January 24, 2008 6:18 PM > To: [email protected] > Subject: RE: residential heads / 4 head calc > > Wow - that question may open a can of worms. I always assumed that > residential sprinklers used in a 13 design had to be calced per > section > 11.3.1 (2007; 11.2.3.5 in the 2002). That section says to calc the 4 > most demanding sprinklers, even if they exist in 4 separate rooms. I > reasoned that it was (in part) to make up for the lower density > allowed for residential sprinklers. Well, the lower density is no > longer allowed in a > 13 design, so that reasoning is kaput. > > In Greg's example (one sprinkler in a unit with self closing doors), > the incentive seems to be to install QR sprinklers instead of residential. > Then, by room design method, only 1 sprinkler is calced instead of 4. > Or maybe the unit has 2 sprinklers, but it still has the impact of > decreasing pipe sizes. > > Since residential sprinklers used in a 13 design now must provide a > minimum .10 density, is there any reason (other than 13 doesn't seem > to allow it) that they shouldn't be allowed to be calced using the > room design method? > > Ed Kramer > Littleton, CO > > > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Greg > McGahan > Sent: Thursday, January 24, 2008 4:15 PM > To: [email protected] > Subject: residential heads / 4 head calc > > Can you use the most demanding room method when calculating > residential sprinklers in a Hotel per NFPA 13? > > QR sprinklers where there is only one head in a motel room with self > closing doors? > > Thank you, > Greg McGahan > > Living Water Fire Protection, LLC > 1160 McKenzie Road > Cantonment, FL 32533 > 850-937-1850 > Fax: 850-937-1852 > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email > to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email > to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email > to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
