Fire Sprinkler Backflow Testing in San Francisco, CA
Fire lines usually carry a double check detector assembly (DCDA) or a reduced pressure detector assembly (RPDA). The bypass meter on the side catches small leaks or unauthorized use without slowing water during a fire.
Fire sprinkler backflow testing has two jobs. The backflow test checks each valve against its required differential, like any other assembly. NFPA 25 also calls for an annual forward flow test at system demand, which proves the assembly will pass the water the sprinklers need.
Assemblies on fire lines are often 4 to 10 inches, and many sit in vaults or riser rooms. Shutting one down takes coordination, because the building is without sprinkler protection during the test. Building owners usually notify the alarm monitoring company before work starts.
The report often goes to two places: the water purveyor and the local fire authority.
Grizzly Backflow & Plumbing connects San Francisco, CA building owners with testers who handle fire line backflow prevention testing and paperwork. Call (833) 990-5874.