Saturday, April 30, 2016

On backflow preventers

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....

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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