To a certain extent, this is a rhetorical question. We can use the 1st floor hose valve on the standpipe as a flow outlet. I assume with the available water, flowing 250 gpm through a single 2-1/2” hose and Hose Monster is not going to be a problem.
But the real problem is that there is not a good way that I know of to predict this. I won’t know until the job is done if there is enough water from the hose outlet to meet the requirement. Then if the system has to be retrofitted, it becomes a big deal and a big expense. How is everyone else handling this? 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) > > On Mar 28, 2024 at 9:54 AM, <Jackie Ward (mailto:[email protected])> wrote: > > > > > > Or mech-tee the riser and add a hose valve. > > > > > > > > > > > > > > > > > Thank you, > > > > > > > > Jackie “JW” Ward > > > > 1-405-240-7076 > > > > > > > > > > > From: Worley, Tom <[email protected]> > Sent: Thursday, March 28, 2024 8:46 AM > To: Discussion list on issues relating to automatic fire sprinklers > <[email protected]> > Subject: [Sprinklerforum] Re: BFP Forward flow test design > > > > > > > > > > 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]) > > > > > (https://urldefense.com/v3/__http:/www.firefoe.com/__;!!O7jEn5k3aH8!cuaHibCXwaAnFLnXeA8jgIgRYiCstZyaNyhuRwNqS9wUz4M2_B9zJ2Ydo3BqWcyCz06VI8GRM1Ln$) > > > > > > > > > > > From: Fpdcdesign <[email protected] (mailto:[email protected])> > Sent: Thursday, March 28, 2024 9:38 AM > To: Sprinklerforum <[email protected] > (mailto:[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) > > > > > > _________________________________________________________ SprinklerForum > mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to [email protected] >
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