I would think that QR is OK but that C-Factor should still be reduced (100).
What does the rest of the forum say? -Kyle M From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Bob Knight Sent: Thursday, November 1, 2018 3:35 PM To: sprinklerforum@lists.firesprinkler.org Subject: RE: [EXTERNAL] Single Preaction System Thanks Kyle, I had read that, but missed the take away. It looks like I should have taken away that I don't need the area increase. What about C Factors, are reductions, etc...? I would assume that since it's calc'ed as a wet system that C120 and reductions would be okay. Thank you, Bob Knight, CET III Fire by Knight, LLC 208-318-3057 From: Kyle.Montgomery [mailto:kmontgom...@aerofire.com] Sent: Thursday, November 01, 2018 4:22 PM To: sprinklerforum@lists.firesprinkler.org<mailto:sprinklerforum@lists.firesprinkler.org>; b...@firebyknight.com<mailto:b...@firebyknight.com> Subject: RE: [EXTERNAL] Single Preaction System See 11.2.3.2.5 and A.11.2.3.2.5. -Kyle M From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Kyle.Montgomery Sent: Thursday, November 1, 2018 3:19 PM To: b...@firebyknight.com<mailto:b...@firebyknight.com>; sprinklerforum@lists.firesprinkler.org<mailto:sprinklerforum@lists.firesprinkler.org> Subject: RE: [EXTERNAL] Single Preaction System One of the biggest impacts is that calculating as a dry system means you have to increase remote area size by 30%, but you don't have to do that if you can calculate as wet. -Kyle M From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Bob Knight Sent: Thursday, November 1, 2018 2:59 PM To: sprinklerforum@lists.firesprinkler.org<mailto:sprinklerforum@lists.firesprinkler.org> Subject: [EXTERNAL] Single Preaction System I'm looking at a cut sheet for an Electric actuated single preaction system. It makes one statement that I haven't been able to find any other info, "In order for a single interlock preaction system to be hydraulically calculated as a wet pipe system, as opposed to a dry pipe sprinkler system, the detection system must be designed to operate sooner than the automatic sprinklers on the sprinkler piping." I understand the operating part, but I swore that NFPA 13 addressed this "wet system" allowance but I can't find it. I've looked back to the 2002 edition, but I can't find anything. What exactly does it mean to be able to calculate as a wet pipe system? Do I use C120, Design Area Reduction for QR, etc...? Thank you, Bob Knight, CET III Fire by Knight, LLC 208-318-3057 [FBK-LOGO-EMAIL]
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