What is the main function of a deluge sprinkler system?

The main function of a deluge sprinkler system is to utilize open sprinklers that allow water to flow from all nozzles when the system is activated. This is achieved through a detection mechanism that opens a valve, delivering water simultaneously to all sprinklers rather than selectively sprinkling based on heat detection, as in other systems like wet or dry pipe systems.

Deluge systems are primarily designed for high-hazard areas where rapid fire spread is a concern. The open design enables quick and effective response to fire conditions by inundating the area with water. This can be especially beneficial in situations involving flammable liquids or materials that might create a fast-moving fire.

The other choices describe different characteristics of sprinkler systems. While manually opened systems require human intervention for activation, and high-temperature actuated systems activate only under specific heat conditions, they do not provide the blanket coverage that a deluge system offers. Systems with limited valve operation also imply selective delivery, which contrasts with the deluge system's comprehensive flooding approach to fire control.