Which statement about a deluge sprinkler system is most accurate?

The statement that all sprinkler heads are open at all times is the most accurate description of a deluge sprinkler system. In a deluge system, the sprinkler heads are designed without individual heat-sensitive elements, which means they do not operate independently. Instead, they remain open, allowing water to flow through all heads simultaneously when the system is activated.

These systems are typically used in high-hazard areas, such as those with flammable materials, where a rapid release of water is necessary to control or extinguish a fire quickly. The activation of the system is generally done through a fire detection system that signals the deluge valve to open, allowing water to flood the entire area covered by the system immediately.

The other statements do not accurately reflect the operation of a deluge sprinkler system. For instance, while smoke detection may trigger the system, it is not true that it activates immediately upon smoke detection, as it relies on a specific fire detection signal. Continuous water flow through the system is also not correct since water only flows when the system is activated. Lastly, a deluge system requires a reliable water supply to function properly, which directly contradicts the idea that it operates without one.