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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