I do agree. That white-paper refers to sloped beamed ceilings. Bob has not specified that is dealing with a sloped ceiling.
Mark E. Eckard S.E.T. Email: [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Wednesday, May 07, 2008 11:20 AM To: [email protected] Subject: Re: Residential Sprinklers and Beam Obstructions Hi Mark, Your questions about the intent an function, even with some blocked spray pattern were concerns during the sloped and beamed ceiling testing that was done.? The Tyco sloped and?beamed ceiling testing is posted under? the 'Literature' drop down on the Tyco website at www.tyco-fire.com.? It appears as a 'White Paper' on the subject, and it is available to all. If you page past the section that has all of the ceiling configurations that were tested, you will find a section on 'Tenability Criteria'.? This was a major part of the pass/fail criteria in each test.? If the sprinklers failed the tenability criteria, the test was not successful.? The results are tabulated in the Appendix for each of the tests.? The partial obstruction of spray patterns had as much (and in some cases, more of an) effect on tenability as it did on controlling the fire. Tom -----Original Message----- From: Eckard, Mark - Mark E <[EMAIL PROTECTED]> To: [email protected] Sent: Wed, 7 May 2008 10:30 am Subject: RE: Residential Sprinklers and Beam Obstructions Re: obstruction to sprinkler spray pattern development in 13-D. First lets take a look at the purpose of NFPA-13D. Chapter 1.2 prevent flash over and to allow the occupants to escape during the 10 minute water supply. If too many sprinklers are operating in an area that has been hydraulically designed for one sprinkler that will (a.) deplete the duration of the reliable water supply, and (b.) the source residual pressure and available flow. The prevention of flashover and control of fire is accomplished through cooling and pre-wetting areas adjacent to the fire. Now. My Opinion combined with rhetorical questioning. Even if there is a small amount of spray pattern obstruction will the sprinkler system accomplish is intended purpose? Will the sprinkler still provide enough cooling effect and provide adequate wetting of surfaces adjacent to the fire? Mark E. Eckard S.E.T. Email: [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bob Knight Sent: Tuesday, May 06, 2008 12:52 PM To: [email protected] Subject: Residential Sprinklers and Beam Obstructions I'm working on a home (13D) that has several rooms with the ceiling broken up by "beam pockets". These vary in width from 2'8" to 3'3" o.c. with the beams being 6" deep. Concealed residential sprinklers are being used. In one room, which is 224 sf, if I place a sprinkler in every pocket like I think I should, there will be 13 sprinklers. This averages out to 17 sf per head. Another room is 375 sf and will require 10 sprinklers. This averages at 37.5 per head. In rooms of this size do I really need a sprinkler in every pocket? Can a sprinkler be placed in every other pocket and be acceptable? Has anyone else found a better way to protect rooms like this? Any and all suggestions will help. Thanks, Bob Knight, CET (208) 318-3057 [EMAIL PROTECTED] www.firebyknight.com _______________________________________________ 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)
