Certified Preaction Fire System Inspection in Ann Arbor, MI

A Preaction Fire System is a sprinkler system that employs closed automatic sprinklers connected to a piping system that contains air or nitrogen that may or may not be pressurized. In the sense of dry pipe and functionality, it is similar to a dry-pipe sprinkler system.

A preaction fire system is generally installed in areas where water is a last resort. A typical installation of a preaction system is in a computer or server room. This system is tied directly into an underground water supply or downstream of the building’s wet system. Most preaction systems maintain air pressure in the piping for supervisory (controlled) reasons. This system requires at least one prior event or activation before water is introduced into the piping. Activation could be one of a few things, like a smoke detector, which will send a signal to the preaction valve and activate water flow. The next activation occurs at a sprinkler head, which sends the signal to open up the water flow.