If you are in NFPA 13, 2013 edition or newer I believe the check valve is required.
Reed A. Roisum, SET | Karges-Faulconbridge, Inc. | Senior Fire Protection Designer | Fargo, ND | direct: 701.552.9903 | mobile: 701.388.1352 | KFIengineers.com<http://www.kfiengineers.com> From: Sprinklerforum <[email protected]> On Behalf Of Fpdcdesign Sent: Tuesday, November 6, 2018 2:38 PM To: Sprinklerforum <[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) ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ______________________________________________________________________ ______________________________________________________________________ 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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