I believe 8.6.4.1.1.3 is referring to a ceiling elevation change where heads must be installed below the lower elevation due to the area and distance from the adjacent wall. To put it another way, the elevation change is out in the middle of a larger room where D from figure 8.6.5.1.2(b) is > than 30" therefore the head must be in the lower elevated lid. A ceiling is not an obstruction in my opinion. A soffit on the other hand is. A soffit is more closely defined by an obstruction as shown in 8.6.5.1.2(b). I believe 8.6.4.1.1.3 is to be followed when it is already established that a head is required under that lower lid as indicated when it states "...the sprinklers shall be permitted to be spaced as though the ceiling was flat, therefore, follow 8.6.4.1.1.3 in that scenario.
Ryan Hinson Burns & McDonnell Direct: 952-656-6003 Ext 3662 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Greg McGahan Sent: Wednesday, September 23, 2009 9:31 AM To: [email protected] Subject: RE: bar backs BUT (A) Where a vertical change in ceiling elevation within the area of coverage of the sprinkler creates a distance of more than 36 in. (914 mm) between the upper ceiling and the sprinkler deflector, a vertical plane extending down from the ceiling at the change in elevation shall be considered a wall for the purpose of sprinkler spacing as shown in Figure 8.6.4.1.1.3(A). According to the new rule I believe that we cannot use the obstruction rules. Greg McGahan Operations Manager Living Water Fire Protection 1160 McKenzie Road P.O. Box 877 Cantonment, Florida 32533 (850) 937.1850 | Fax (850) 937.1852 | Cell (850) 554.3231 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Bryan Dann Sent: Wednesday, September 23, 2009 9:25 AM To: [email protected] Subject: RE: bar backs Take a look at Figure 8.6.5.1(b) page 13-57 NFPA 13(07) If head can be 4'6 away from obstruction your ok. Bryan A. Dann Dannba Design Services, LLC Fire Sprinkler Designs Office: (740) 363-5878 Cell: (740) 803-0967 [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Greg McGahan Sent: Wednesday, September 23, 2009 9:59 AM To: [email protected] Subject: bar backs I have seen dozens if not hundreds of similar situation without sprinklers and just wanted to get the professional spin on it: The area behind a bar where the liquor is kept has a ceiling height of 9-6 and the remainder if the Bar is at 13'-0". Of course the "soffit" is about 1'-9" wide. My thoughts are that a head is required due to the difference in elevation being greater than 3'-0". Any other thoughts? Greg McGahan Operations Manager Living Water Fire Protection 1160 McKenzie Road P.O. Box 877 Cantonment, Florida 32533 (850) 937.1850 | Fax (850) 937.1852 | Cell (850) 554.3231 [email protected] _______________________________________________ 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)
