Which statement is true of wet-pipe sprinkler systems?

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Multiple Choice

Which statement is true of wet-pipe sprinkler systems?

Wet-pipe sprinkler systems keep water in the piping under pressure at all times. When a sprinkler head is heated, the operating element (like a glass bulb or fusible link) opens and water instantly flows through the piping to the head, delivering immediate discharge. Because the pipes are already filled with water, there’s no need to vent air first or start a separate water supply to release water. This immediate response is why the statement about water being under pressure in the system is true. In contrast, the idea that air escapes first isn’t accurate for wet-pipe systems, since water is already present in the pipes. Wet-pipe systems are also not designed for spaces that stay below freezing; they are typically installed where temperatures are kept above freezing to avoid pipe damage. And they don’t generally require a lot of maintenance; they are simpler than some other system types and focus on regular inspections and testing.

Wet-pipe sprinkler systems keep water in the piping under pressure at all times. When a sprinkler head is heated, the operating element (like a glass bulb or fusible link) opens and water instantly flows through the piping to the head, delivering immediate discharge. Because the pipes are already filled with water, there’s no need to vent air first or start a separate water supply to release water. This immediate response is why the statement about water being under pressure in the system is true.

In contrast, the idea that air escapes first isn’t accurate for wet-pipe systems, since water is already present in the pipes. Wet-pipe systems are also not designed for spaces that stay below freezing; they are typically installed where temperatures are kept above freezing to avoid pipe damage. And they don’t generally require a lot of maintenance; they are simpler than some other system types and focus on regular inspections and testing.

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