Just make the main drain 2½. A 2” may even suffice depending on how the water supply is.
Thomas R. Worley Estimator/Design Manager Fire Foe Corp. 999 Trumbull Ave. Girard, OH 44420 P: 330-759-9834 x112 F: 330-759-8949 E: [email protected]<mailto:[email protected]> [cid:[email protected]]<http://www.firefoe.com/> 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 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)
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