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)
