Dry pipe and wet pipe sprinkler systems are two types of fire suppression systems that are commonly used in buildings to protect against fires. The primary difference between the two systems is the way that water is distributed through the system.
In a wet pipe sprinkler system, the pipes are constantly filled with water, which is ready to be released through the sprinkler heads as soon as a fire is detected. When a fire occurs, the heat activates the sprinkler heads, which then release water to extinguish the fire. Wet pipe systems are relatively simple, reliable, and cost-effective, which makes them the most common type of sprinkler system in use today.
On the other hand, a dry pipe sprinkler system is designed for use in areas where the pipes may be exposed to freezing temperatures, such as in unheated buildings or in cold climates. Unlike wet pipe systems, dry pipe systems are filled with pressurized air or nitrogen instead of water. When a fire is detected, the air pressure drops, which then triggers the release of water through the sprinkler heads. Dry pipe systems are more complex and expensive than wet pipe systems, but they are necessary in certain environments to prevent the pipes from freezing and potentially bursting.
In summary, wet pipe sprinkler systems are the most common type of fire suppression system and are always filled with water, while dry pipe sprinkler systems are designed for use in areas where the pipes may be exposed to freezing temperatures and are filled with pressurized air or nitrogen instead of water.