For fire protection purposes, an integrated systems of under ground and overhead piping designed in accordance with engineering standards.
 
 The system is usually activated by heat from a fire and discharges water over the fire area.
 
 The installation includes at least one automatic water supply that supplies one or more systems. The portion of the sprinkler system above ground is a network of specially sized or hydraulically designed piping installed in a
 building, structure, or area, generally overhead, and to which sprinklers are attached in a systematic pattern. Each system has a control valve located in the system riser or its supply piping.
 
 WET SPRINKLER SYSTEM
 
 A sprinkler system employing automatic sprinklers attached to a piping system containing water and connected to a water supply so that water discharges immediately from sprinklers opened by heat from a fire.
 
 
 DRY SPRINKLER SYSTEM
 
 A sprinkler system employing automatic sprinklers that are attached to a piping system containing air or nitrogen under pressure, the release of which permits the water pressure to open a valve known as a dry pipe valve, and the water then flows into the piping system and out the opened sprinklers.
 
 PRE-ACTION SPRINKLER SYSTEM
 
 A sprinkler system employing automatic sprinklers that are attached to a piping system that contains air that might or might not be under pressure, with a supplemental detection system installed in the same areas as sprinklers.
 
 
 
 DELUGE SPRINKLER SYSTEM
 
 A sprinkler system employing open sprinklers that are attached to a piping system that is connected to a water supply through a valve that is opened by the operation of a detection system installed in the same areas as the sprinklers. When this valve opens, water flows into the piping system and discharges from all sprinklers attached thereto.