When the volume of trapped water in a dry pipe system exceeds 5 gallons, what is the minimum requirement for the auxiliary drain?

In a dry pipe system, managing trapped water is crucial for the system's integrity and effectiveness. When the volume of trapped water exceeds 5 gallons, it is essential to have a proper means for draining this water to prevent issues such as freezing, which can compromise the system.

The drum drip serves as a dedicated drainage point designed to collect and remove the trapped water effectively. Its design allows for the accumulation of water in a specific area, where it can be drained safely without disrupting the operation of the system. The drum drip is particularly effective in systems with significant volumes of trapped water, ensuring that the dry pipe remains functional and efficient.

In contrast, the options that refer to valves, such as the various sizes, are typically used for isolating or controlling water flow rather than for draining accumulated water. These valves do not provide the necessary collection and drainage capability like a drum drip does when there is a significant volume of trapped water. Thus, the drum drip is the most appropriate requirement when such a volume of trapped water is identified in a dry pipe system.