I'm not a PE nor do I play one on TV. But I've seen James' fire videos, so I'm ahead of most plumbing designers:)
Caveats aside, I think activation depends on heat banking down from the ceiling, and in order to get a head to throw 24' it has to go off- and that's a long way for heat to go without a backdrop to stop heat from continuing to the next SSP below a flat ceiling. The "wall" or soffit behind the SW will stop that heat from continuing past it and turn it toward the thermal element. Heat Creep? I've never been a fan of protecting a 48' wide area by ECHSW on opposing walls. Wouldn't think there'd be much life safety offered. glc -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of A.P.Silva Sent: Monday, January 05, 2009 1:32 PM To: [email protected] Subject: RE: Sidewall Sprinklers I agree, the codes do not permit installation of sidewalls without a backwall/soffit/beam in any other situation. However, this is something I have often wondered myself. Granted, all closed sprinklers actuated by thermal elements require to be in proximity to a ceiling. The thermal elements in sidewalls are the same as pendents and uprights. So why would only sidewall also require a backwall? Is the acuation of sidewalls different from pendents and uprights? I think the originator of this post is asking a valid question. Tony -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Roland Huggins Sent: January 5, 2009 8:55 AM To: [email protected] Subject: Re: Sidewall Sprinklers The only exception to not having a wall, soffit, or beam behind them is when installed UNDER roll-up doors ( as allowed by 8.4.2 (3) Roland On Dec 31, 2008, at 11:37 AM, Dale Wingard wrote: > Duane, > > NFPA 13(2007) 8.7.4.1.2 addresses the location of vertical and > horizontal sidewalls in relation to the wall that they are projected > from. > > Sidewall sprinklers cannot be positioned in the center of a room as a > pendant. > > > Dale F. Wingard, SET > Design Manager > Triple "A" Fire Protection, Inc. > 251.649.2034 > [email protected] > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > Johnson, Duane (NIH/OD/ORS) [C] > Sent: Wednesday, December 31, 2008 11:34 AM > To: [email protected] > Subject: Sidewall Sprinklers > > > Can a horizontal sidewall sprinkler be installed in the center of a > room (flat, smooth clg) provided sprinkler coverage is added behind > the sidewall? In other words, not installed near a wall or soffit. > > In reality a sidewall installed 4" to 6" below the ceiling (away from > a > wall/soffit) should activate in similar fashion as exposed pendents > and uprights (1" - 12" below clg). If code permits "exposed" > sidewalls to be installed below roll up doors without soffits, can't > an "exposed" > sidewall be installed elsewhere? > > Is there anything in the listing of a sidewall that requires the > sprinkler be installed on a wall or soffit? Are there any ROP/ROC > responses from the committee that would help answer the question? > > Thoughts? > > Duane Johnson, PE > Program Manager > Division of the Fire Marshal (Support Contractor) Office of Research > Services National Institutes of Health > 301-496-0487 > _______________________________________________ > Sprinklerforum mailing list > http://lists.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 > http://lists.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 http://lists.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 http://lists.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 http://lists.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)
