Gents, I am bidding out a design for an NFPA 13 R system and could use some technical advise. Any idea as to who may be able to assist? ________________________________ From: Sprinklerforum <[email protected]> on behalf of Ron Greenman <[email protected]> Sent: Tuesday, November 6, 2018 4:17 PM To: [email protected] Subject: Re: Back to back floor controls.
Just a guess (perhaps educated but a guess nonetheless) but I'd think any flow whatsoever from the non-flowing line would be back towards the flowing line and only momentarily until everything equalized. If the paddle moves at all it would be the wrong direction and the flow switch mechanism would remain in its resting position. Ron Greenman [email protected]<mailto:[email protected]> 253.576.9700 The Universe is monstrously indifferent to the presence of man. -Werner Herzog, screenwriter, film director, author, actor and opera director (1942-) On Tue, Nov 6, 2018 at 1:09 PM Fpdcdesign <[email protected]<mailto:[email protected]>> wrote: This is being done per the 2010 edition before that text was added. The only requirements I see in that version for a check valve is if you are connecting to a combination sprinkler standpipe riser (and if the zone valves are interconnected). My question was more of an operational one as opposed to a Code one. Are two flow switches on different branches in close proximity subject to simultaneous operation? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080 (ofc) 860-553-3553 (fax) 860-608-4559 (cell) On Nov 6, 2018 at 3:48 PM, <John Denhardt<mailto:[email protected]>> wrote: I agree. Check valves are required. John John August Denhardt, P.E. Strickland Fire Protection On Nov 6, 2018, at 3:41 PM, Mike Stossel <[email protected]<mailto:[email protected]>> wrote: If I am understanding you question correctly, check valves are required. 8.16.1.5 Floor Control Valve Assemblies. 8.16.1.5.1* Multistory buildings exceeding two stories in height shall be provided with a floor control valve, check valve, main drain valve, and flow switch for isolation, control, and annunciation of water flow on each floor level. Mike Stossel SET <image002.png> 36 Barren Road East Stroudsburg, PA 18302 Office: 973-670-2627 [email protected]<mailto:[email protected]> From: Sprinklerforum <[email protected]<mailto:[email protected]>> On Behalf Of Fpdcdesign Sent: Tuesday, November 6, 2018 3:38 PM To: Sprinklerforum <[email protected]<mailto:[email protected]>> Subject: Back to back floor controls. I am working on an existing two story plus attic wood frame building. The engineer is requiring zone control assemblies (butterfly valve plus riser manifold) for every level including the attic. I have designed it so there is a bull head tee at the top of a 4” riser with the assemblies on either side of the tee. Given that the flow switches are going to be in close proximity, should I install a check valve between the butterfly valve and the manifold? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080 (ofc) 860-553-3553 (fax) 860-608-4559 (cell) _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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