Which type of sprinkler system is the most common and easiest to maintain?

The wet pipe sprinkler system is considered the most common and easiest to maintain because it operates with water filled in the pipes at all times. This design allows for immediate discharge of water when a sprinkler head is activated by heat, making it highly effective in suppressing fires quickly.

Maintenance is relatively straightforward; routine inspections often involve checking for leaks, ensuring that the system is free from obstructions, and testing the main water supply and valves. Because the system is pressurized and always ready for action, there is less complexity involved compared to dry pipe, pre-action, or deluge systems, which may require additional components like air or other activation mechanisms.

In contrast, dry pipe systems have air pressure that holds back the water until activated, which can complicate maintenance and response time. Pre-action systems have a two-step activation involving the detection of fire as well as the activation of the water supply, adding layers of complexity. Deluge systems, while effective for high-hazard areas, are always open to flow, meaning they require more extensive management to prevent unwanted discharges and possible water damage.

Thus, the simplicity of the wet pipe system, coupled with its reliability and readiness, makes it the most prevalent choice in many fire protection applications.