You could refer him to 2016 NFPA 13 9.2.3.5.2.2 Unless flexible sprinkler hose fittings in accordance with 9.2.1.3.3.1 are used, the hanger closest to the sprinkler shall be of a type that prevents upward movement of the pipe.
Then show him that you are in compliance with 9.2.1.3.3, and explain that the reason the hanger closest to the sprinkler does not have to prevent upward movement, is specifically because the bracket that is provide with the listed flex drop assembly does the job of preventing the upward movement. If you want to make him not feel so bad, you could say something about how he is correct in thinking this would be an issue, if not for the bracket attached to the ceiling. Maybe show him how they attach. He would have to be pretty dumb to see one installed correctly and still think this would be an issue. -Kyle M From: Sprinklerforum [mailto:[email protected]] On Behalf Of Richard Mote Sent: Wednesday, May 30, 2018 8:59 AM To: [email protected] Subject: [EXTERNAL] Ceiling Grids and Flex Drops I have a AHJ that is questioning the use of Flex Drops especially the Victaulic ones. He says that they are so flexible that when a sprinkler goes off the jet effect is going to lift the sprinkler up through the ceiling. I told him that the drops are mechanically attached to the ceiling grid and in order to lift up they would have to lift the entire weight of the ceiling grid, ceiling tiles, the lights and HVAC diffusers. His answer prove, it either by letter from the manufacturer or from someone a lot higher up the food chain than either he or I am. Or something specific in NFPA 13 that says he is wrong. Richard Mote Design Manager [http://www.rowesprinkler.com/emailsig/Email_Sig_Logo.jpg] W: 877.324.ROWE * F: 570.837.6335 PO Box 407 * 7993 US Route 522, Suite 1 * Middleburg, PA 17842 505 A Cornerstone Court * Hillsborough, NC 27278 RoweSprinkler.com * [email protected]<mailto:[email protected]>
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