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Although there are several system types, the three automatic fire sprinkler systems most frequently installed are listed below, with brief descriptions of each type. Wet Systems | Dry Systems | Pre-Action Systems
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| Dry pipe systems are installed where piping is subject
to freezing. Dry systems consist of automatic sprinklers attached
to piping that contains pressurized air or nitrogen, in place of water.
As the sprinkler head opens, triggered by the heat of the fire, it
releases the pressurized agent. The rapid reduction of pressure within
the pipes opens clappers, allowing the water to enter the piping and
flow through heads activated by the fire. | 
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| Pre-action systems provide protection and security from
accidental water discharge. As with the other two systems, automatic
sprinkler heads are attached to a piping system. However, pre-action
systems normally require a separate detection device as well. This
device regulates the deluge water control valve, opening it in the
event of fire allowing water to flow to the heads activated by the
fire's heat. An audible alarm also sounds prior to the discharge of
water. | 
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