Depends on the design of the FDC itself, some have clappers that will potentially shut both outlets but a lot of them have a single one in the middle that will shut just one side if only one hose is attached and would likely shut one side when flowed. NFPA 13 requires 1 2 ½” hose valve per 250 gpm for forward flow testing. I believe the hose valves do not need to be accessible from the outside as long as there’s a means to run a hose outside from your riser room you could probably just stick a 2 ½ hose valve on the system and be good?
Mike Morey CFPS 3229 • NICET S.E.T. 123677 Project Manager • Fire Protection Group Shambaugh & Son, LP an EMCOR Company 7614 Opportunity Drive • Fort Wayne, IN • 46825 direct 260.487.7824 / cell 260.417.0625 / fax 260.487.7991 email [email protected]<mailto:[email protected]> [cid:[email protected]] From: Fpdcdesign <[email protected]> Sent: Thursday, March 28, 2024 9:38 AM To: Sprinklerforum <[email protected]> Subject: [Sprinklerforum] BFP Forward flow test design I am working on a re-design of a system where I need to include a provision for doing a forward flow test for the backflow preventer (4”). Due to space issues, I would like to do a by-pass around the check valve to the FDC. Is there a problem ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message originated outside your organization. ZjQcmQRYFpfptBannerEnd I am working on a re-design of a system where I need to include a provision for doing a forward flow test for the backflow preventer (4”). Due to space issues, I would like to do a by-pass around the check valve to the FDC. Is there a problem with this due to the clappers in the FDC? Also, the building is Residential or Light Hazard and the maximum demand flow is around 250 gpm. If I have to add another outlet for the test, would a single 2-1/2” FDC be acceptable? Unfortunately, I am not aware of any way to predict what would be required. Is there any rule of thumb for the design of these things? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080<tel:860-535-2080> (ofc) 860-554-7054<tel:860-554-7054> (fax) 860-608-4559<tel:860-608-4559> (cell) This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient.
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