How does the refilling time of a dry system change when serving a freezer?

When a dry sprinkler system serves a freezer, the refilling time increases due to several factors associated with the temperature and the environment within a freezer. In a dry sprinkler system, pressurized air or nitrogen is used to prevent water from entering the pipes until the system is activated by heat from a fire.

Freezers operate at low temperatures, which can cause the water in the pipes to freeze if it were to accidentally enter during a system activation. To prevent this from happening, greater care must be taken to manage the water flow and the refilling process. Furthermore, if the dry system does discharge due to smoke or heat detection, the refilling process would take longer because of the low ambient temperatures that may affect water movement and pressure.

Additionally, any added fittings or specialized equipment designed to cope with these situations might also extend the time it takes to refill the system after activation. Therefore, the unique operational characteristics of serving a freezer environment directly contribute to a longer refilling time in dry sprinkler systems.