Yep if it's 18" and a hair your good. Public storage and other big names have this system with chicken wire a min of 18.0125 between the deflector and no patrons going to deck expect corridors.
Sent from my Verizon 4G LTE Droid On Jan 29, 2017 5:48 PM, Damien Shannon <[email protected]> wrote: John. In your original post you stated ‘I am trying to determine the proper deflector distance from a partition with the top located 18” below the sprinkler deflector.’. So, based on that it seems you have 18” clearance from the sprinkler deflector to the top of the partition. Given the magnitude of difference it would be making, is there no way the partitions can be organised to be 18.005” below the deflector, thereby putting the partitions in excess of 18” below the deflector, thereby allowing the partitions to be ignored? A rub of sandpaper do it? My understanding is that if it is any bit in excess of the 18” it can be ignored. Regards. Damien Shannon. From: Sprinklerforum [mailto:[email protected]] On Behalf Of [email protected] Sent: 29 January 2017 23:32 To: [email protected] Subject: RE: Floor mounted obstructions - ORDINARY HAZ Your welcome...:) I will get that arrangement approved with the contractor on Monday. The fix should keep the trainee busy for a day or two, lol John Paulsen Crown Fire System Design Get Outlook for Android<https://aka.ms/ghei36> On Sun, Jan 29, 2017 at 4:07 PM -0500, "Brad Casterline" <[email protected]<mailto:[email protected]>> wrote: Centered on the partial height partitions sounds perfect, and with a little creative staggered spacing you could avoid baffles. Odds are your AHJ would concur. You're welcome and thank you for my weekend sprinkler puzzle ;) Brad On Jan 29, 2017 1:16 PM, <[email protected]<mailto:[email protected]>> wrote: Thanks guys for your comments. I feel like I am trying to choose between evils here. If I can't place the sprinkler over the top of the low partition to spray on both sides, I am definitely going to cold shower on the 5' & 7' wide units....this project just became 4 stories of real problems. Thanks, John Paulsen Crown Fire System Design Get Outlook for Android<https://aka.ms/ghei36> On Sun, Jan 29, 2017 at 1:29 PM -0500, "Pete Schwab" <[email protected]<mailto:[email protected]>> wrote: There have been submittals to SSI to allow the partition rule for OH. They have been rejected since no one has submitted testing data. So in response to the original question, yes you have to consider each partition as it went to the ceiling and yes you still have to be concerned with cold soldering. Many of the national self-storage facility owners/builders understand that the top of storage must be 18” from the sprinkler deflector (Usually accomplished with chicken wire) . Pete Schwab My opinion only and not that of the NFPA or any of its committees From: Sprinklerforum [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Brad Casterline Sent: Sunday, January 29, 2017 12:59 PM To: [email protected]<mailto:[email protected]> Subject: RE: Floor mounted obstructions - ORDINARY HAZ John, I agree with your 'common sense' statement, so this has been bothering me since you posted it. I'm looking at NFPA 13 (2013), Fig. 8.6.5.2.2, and imagining my cubicle at the office. "A"=~36" and "B"=~30". The next sprinkler to the right is about 11' from the partition. My space is to the right side, and I have a kind of narrow counter against the partion with papers and prints scattered across it. Now I imagine the sprink shown in the fig activating, and 20-30% of the pattern being thrown over the partition and landing on the floor a few feet beyond the counter. Maybe The Committee felt that type of thing would be acceptable for LH but not OH? Brad On Jan 28, 2017 11:39 AM, "John Paulsen" <[email protected]<mailto:[email protected]>> wrote: Jeff: Amen on the “not clearly stated”! I saw that paragraph, but it appeared to me to refer more to obstructions from the ceiling not the floor. I’m trying to throw over the top of the partition and it would be nice if NFPA-13 could give a spacing table for Ordinary Hazard like it does for “Light Hazard only”. That’s the frustrating part, common sense says the same or similar spacing would apply, but Ordinary Hazard is not included. Thanks, John Paulsen – SET Crown Fire System Design 6282 Seeds Rd. Grove City, OH 43123 P – 614-782-2438<tel:(614)%20782-2438> F – 614-782-2374<tel:(614)%20782-2374> C – 614-348-8206<tel:(614)%20348-8206> From: Sprinklerforum [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Jeff Normand Sent: Saturday, January 28, 2017 12:32 PM To: [email protected]<mailto:[email protected]> Subject: Re: Floor mounted obstructions - ORDINARY HAZ Not that clearly stated but here's the NFPA 13 2016 edition 8.6.5.3.1 Continuous or noncontinuous obstructions that interrupt the water discharge in a horizontal plane more than 18 in. (450 mm) below the sprinkler deflector in a manner to limit the distribution from reaching the protected hazard shall comply with 8.6.5.3. 8.6.5.3.2 The requirements of 8.6.5.3 shall also apply to obstructions 18 in. (450 mm) or less below the sprinkler for light and ordinary hazard occupancies. A.8.6.5.3.3 When obstructions are located more than 18 in. (450 mm) below the sprinkler deflector, an adequate spray pattern develops and obstructions up to and including 4 ft (1.2 m) wide do not require additional protection underneath. Examples are ducts, decks, open grate flooring, catwalks, cutting tables, overhead doors, soffits, ceiling panels, and other similar obstructions. On Sat, Jan 28, 2017 at 11:10 AM, John Paulsen <[email protected]<mailto:[email protected]>> wrote: I am trying to determine the proper deflector distance from a partition with the top located 18” below the sprinkler deflector. This is an Ord Haz Grp II Self Storage facility with standard spray QR Tyco TY-FRB TY3131 uprights. Sec 8.6.5.2 doesn’t give a table like 8.6.5.2.2 which is for Light Hazard only. If I have to space the heads as if the low partitions went all the way to the deck, I will violate the 6’ minimum rule. What am I missing here? 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