What type of fire sprinkler system is the most common in use?

The wet pipe system is the most common type of fire sprinkler system because it is simple and effective for a wide range of applications. In a wet pipe system, the pipes are filled with water at all times, allowing for immediate discharge of water when a sprinkler head is activated due to heat from a fire. This system is particularly beneficial in environments where the temperatures do not drop to freezing, as it ensures a quick response time, which is crucial in minimizing fire damage and enhancing life safety.

Additionally, wet pipe systems have lower installation and maintenance costs compared to other types of systems, making them more economically viable for many buildings. They are widely accepted in residential and commercial buildings, and their reliability is well-established through extensive use and testing. The design simplicity contributes to ease of maintenance, further reinforcing their prominence as the preferred choice for fire protection. Other systems like dry pipe, pre-action, and deluge systems are used in specific circumstances, typically where the conditions or risks necessitate special consideration, making them less common overall.