What is the minimum temperature required for standard pendant sprinklers to be used on dry systems?

The minimum temperature required for standard pendant sprinklers to be used on dry systems is 40 degrees Fahrenheit. This temperature is essential because dry pipe sprinkler systems are filled with air or nitrogen until activated, which means that they are particularly sensitive to temperature changes. If the temperature falls below 40 degrees, there is a risk that the air pressure may cause condensation to form within the piping. This condensation can lead to corrosion or freeze, which would obstruct the system and significantly reduce its effectiveness in a fire emergency. Therefore, adherence to this minimum temperature ensures reliability and proper operation of the sprinkler system in protecting against fire hazards. This guideline is crucial for ensuring that the system remains functional and effective in its role as a fire safety mechanism.