Looking at 155°F EC pendents and uprights, 20x20 are standard response and 18x18 (or less) are quick response. In other words, the sprinkler is either 9' away or 10' away from the fire.
This leads one to believe that it would be possible to have an exposed HSW listed for a 10' throw for at least standard response, maybe quick response. Note, that if a 'recessed' or even 'concealed' pendent can get a listing at 9' or 10' away from the fire, you would think an exposed sidewall 4'-6" below the ceiling could receive a listing. Especially since 4"-6" below the ceiling is more ideal for a quick activation time than a recessed pendent. Duane Johnson, PE Program Manager Division of the Fire Marshal (Support Contractor) Office of Research Services National Institutes of Health 301-496-0487 -----Original Message----- From: A.P.Silva [mailto:[email protected]] Sent: Monday, January 05, 2009 2:07 PM To: [email protected] Subject: RE: Sidewall Sprinklers Say you have a room that is 24 feet wide. The first 12 feet is covered with a pendent 6 feet feom the left wall. What is the problem with having a sidewall at the centre of the room facing towards the right wall to cover that part of the room. I know NFPA codes doesn't allow it. But I'd like to hear a logical argument opposing it. Maybe the sidewall also has some backspray and the backwall helps to form the spray pattern? Tony -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: January 5, 2009 11:48 AM To: [email protected] Subject: RE: Sidewall Sprinklers Activation is most likely not the issue but pattern of discharge. At the wall there is no real need for discharge in more than one direction as opposed to a pendent or upright in the middle of a room where you're seeking a 360 degree field of discharge. Same deal for the sidewall under the garage door. Beyond the door the ceiling sprinks do their job, SW is only concerned with one direction, the space below the door. Craig L. Prahl, CET Fire Protection Specialist Mechanical Department CH2MHILL Lockwood Greene 1500 International Drive PO Box 491, Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 [email protected] http://www.ch2m.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of George Church Sent: Monday, January 05, 2009 1:44 PM To: [email protected] Subject: RE: Sidewall Sprinklers 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) _______________________________________________ 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)
