Depending on the water jurisdiction your fire sprinkler system may or may not have a backflow preventer. There are good backflow installations and bad backflow installations. Most common is a lack of a proper drain for the relief valves on RPZ type backflow preventers.
Backflow preventers have their issues....
Backflow preventers have their issues....
Close up of RV leaking below
Below, a typical double check backflow on a fire line - Florida.
Flushing test cocks prior to testing - industry requirement, below
Shown below is an installation with inadequate access for maintenance. Logo of installing firm has been redacted.
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