The two main types of fire sprinkler systems are wet pipe systems and dry pipe systems.
Wet pipe systems are the most common type of fire sprinkler system, and they are typically found in buildings that are heated and protected from freezing temperatures. These systems are designed to be filled with water at all times, so when a fire is detected, the sprinkler heads are activated and water immediately flows from them onto the fire.
Dry pipe systems, on the other hand, are designed for buildings that are not heated and may be subject to freezing temperatures. In these systems, the pipes are filled with pressurized air or nitrogen instead of water. When a fire is detected, the sprinkler heads open and release the pressurized air or nitrogen, which allows water to flow into the pipes and out of the sprinkler heads onto the fire.
Both types of systems have their advantages and disadvantages, and the type of system that is appropriate for a particular building will depend on a number of factors, such as the type of building, the potential fire hazards, and the local climate