Which type of automatic sprinkler system is most commonly used?

The wet sprinkler system is the most commonly used type of automatic sprinkler system primarily due to its effectiveness and reliability. This system contains water in the pipes at all times under pressure, meaning that when a sprinkler head is activated due to heat from a fire, water is immediately discharged. This rapid response is crucial in helping to control or extinguish a fire before it can spread, thereby reducing potential damage and improving safety.

Wet sprinkler systems are particularly well-suited for a variety of settings, including commercial buildings, warehouses, and homes, where the climate does not subject the pipes to freezing temperatures. They are designed for optimal performance in areas where the environment allows for the constant presence of water without the risk of freezing.

Other systems like dry, preaction, and deluge systems are used in specific circumstances or environments. For instance, dry sprinkler systems are installed in locations prone to freezing, preaction systems combine features of both wet and dry systems for enhanced fire protection, and deluge systems are employed in high-hazard areas where rapid water discharge for cooling and fire control is necessary. However, these specialized systems do not match the widespread use and versatility of the wet sprinkler system.