Kyle, Refer to NFPA-13, 2016 Ed, page 52, parag. 8.4.6.6. This may apply to your situation.
John O'Connor National Fire Sprinklers, Inc. Nashville TN From: Sprinklerforum [mailto:[email protected]] On Behalf Of Kyle.Montgomery Sent: Monday, October 08, 2018 3:26 PM To: [email protected] Subject: Converting from ESFR to CMDA - Spacing Issues We're looking at a project where a portion of an existing ESFR building is being converted to store cartooned expanded plastics. It looks like we've settled on a design criteria that involves changing out the sprinklers at the deck to 11.2K standard spray sprinklers at a 0.45 density and adding 2 levels of in-rack sprinklers. This issue I need to address is this: Existing ESFR sprinklers took advantage of the spacing allowance to avoid being obstructed by structural members. The lines are 10 ft on-center and the head spacing is 10, 10, 9, 11, 10, 10, 9, 11. The new upright sprinklers are limited to 100 square foot maximum spacing. Is there any good option/allowance where we could just replace the heads and keep the spacing? Or are we going to need to relocate every fourth head to maintain 10-foot spacing all the way down the branch line. I'm pretty sure FM Global allows for this, but I haven't found anything in NFPA 13 outside of the ESFR section. It sure seems like if it's appropriate for ESFR heads (arguably the most finicky with regard to spacing/obstructions) that the same spacing should be OK for standard spray sprinklers. Kyle Montgomery cid:[email protected] Aero Automatic Sprinkler Co. 21605 N. Central Ave. Phoenix, AZ 85024 Direct: 623.580.7820 Cell: 602.763.4736 <mailto:[email protected]> [email protected] <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_cam paign=sig-email&utm_content=emailclient> Virus-free. <http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_cam paign=sig-email&utm_content=emailclient> www.avg.com
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