I was under the impression that the 8’ minimum had to do with skipping when the fire plume is moved by the first head going off?
Matt From: Sprinklerforum [mailto:[email protected]] On Behalf Of Brian Harris Sent: Friday, February 16, 2018 8:46 AM To: [email protected] Subject: RE: ESFR Heads in Concrete Tee's Mark- I got a phone call yesterday from a member of one of the committees who essentially said the same thing. I’ve re-spotted heads using ESFR in each pocket over the storage area and the calc’s are much better, still need to find some more cushion somewhere. Thanks again for the response. Brian Harris, CET BVS Systems Inc. bvssytemsinc.com<http://bvssystemsinc.com/> From: Sprinklerforum [mailto:[email protected]] On Behalf Of Mark Sornsin [FAR] Sent: Friday, February 16, 2018 9:41 AM To: '[email protected]' Subject: RE: ESFR Heads in Concrete Tee's This may not be an FM job – and FM doesn’t use the term ESFR anymore, but… I am familiar with an FM job where storage (aka ESFR) sprinklers were used in every tee space of concrete tee construction – they were 30” deep tees. The rule against not spacing sprinklers closer than 8’ didn’t apply because the tees prevented cold soldering. The trick however is that FM has a minimum design area for their storage sprinkler calculations (Despite the base design being 12 sprinklers at a given pressure). That area is 12 x the minimum sprinkler coverage area of 64 sq.ft., which is 768 sq.ft. I.e. if your design area does not meet 768 sq.ft. FM requires you add sprinklers until you reach that threshold. Again, the main point here is that the minimum spacing is meant for adjacent sprinklers, but not those obstructed from each other by construction features – at least in FM’s opinion. [Visit our Website at www.SummitCoUS.com]<http://www.SummitCoUS.com> Mark Sornsin Sr. Fire Protection Engineer Direct: 701-499-1391 Cell: 701-526-8585 From: Sprinklerforum [mailto:[email protected]] On Behalf Of Brian Harris Sent: Thursday, February 15, 2018 3:29 PM To: [email protected]<mailto:[email protected]> Subject: ESFR Heads in Concrete Tee's Looking for some confirmation that ESFR heads cannot be used with concrete tee construction when the tee is 26” deep. Cut sheet says in this case you’d have to put them in each bay but also says heads can’t be closer than 8’, tee’s are 6’ on center. Brian Harris, CET BVS Systems Inc. Design Manager bvssystemsinc.com<http://bvssystemsinc.com/> Phone: 704.896.9989 Fax: 704.896.1935 ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ______________________________________________________________________
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