Foam-water deluge system is defined as?

• A. A foam-water sprinkler system employing open discharge devices, connected to a water supply through a valve opened by a detection system.
• B. A foam-wall sprinkler with closed devices.
• C. A foam-water system using dry piping.
• D. A foam-water system using only mist.

Answer: (A)

Foam-water deluge systems are designed to deliver foam solution to all discharge points at once. The defining feature is that every discharge device is open (no individual heads with shutoff valves), so when the system is activated, the foam-water flows through all outlets simultaneously. Activation is accomplished by a detection system that opens a valve feeding the entire network, allowing water mixed with foam concentrate to discharge through all open devices. This rapid, blanket coverage is what characterizes a foam-water deluge arrangement.

The other descriptions don’t fit because they imply closed-discharge devices, or piping that isn’t pressurized with water until activation (dry piping), or configurations that rely on mist rather than a full foam-water distribution through open outlets.