Back flow preventer for sprinker line

I was told that I needed a back flow preventer for the separate line feeding my fire sprinkler system. Do sprinkler feeds also require back flow prevention valves? Do sprinkler feeds come off the pipes which also feed household water (in which case back flow protectors make absolute sense). Is there a code section someone could point me toward which addresses this? Thanks as always….

housepoor

in Plumbing 11 years and 2 months ago

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Augustiner | 11 years and 2 months ago

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I had the same problem. We had to put a whole new supply from across the street because code requires a 3″ line and I had only 2″. I also was required to create a hydrant in the front yard because there is none near my building

arch007 | 11 years and 2 months ago

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yes need it, it can prevent you or your neighbors from drinking stagnant water that is sitting in your sprinkler system. I have done a few back flow prevention device drawings, these need to be done by an architect or engineer. http://nyc-dob.com

ellenlourie | 11 years and 2 months ago

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These backflow preventers are part of cross contamination control. Must be filed with dep and dob. Installation must be done by licensed plumber and testing must be done by state certified back flow preventer tester. Every year they must be tested. This is old law, but it had a 5 years grace period which expired last year and all these requirements became mandatory.

thetinkerswagon | 11 years and 2 months ago

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anything that comes in off the city main needs a break (such as a faucet a few inches above a basin) or a backflow preventer. i can not point you to the city code, but the logic is there and the code does exist. I once heard that the fear was that if a fire dept pumper hooked up to a fire hydrant on a street, that they would pull water out of buildings on that block.