Standard pendant sprinklers are allowed on dry systems, but they must be installed on goose necks. The piping must be installed in an area maintained at or above __ degrees.

The requirement for standard pendant sprinklers to be installed on dry systems, specifically on goose necks, ensures that they function properly in environments where water is not present in the pipes. When these sprinklers are utilized in dry systems, it is crucial that the area where the piping is installed is maintained at temperatures above freezing to prevent the risk of freezing and subsequent damage to the system.

Maintaining a temperature at or above 40 degrees is essential because temperatures below this threshold could lead to the expansion of any residual water or condensation, which would result in ice formation. Ice buildup in the pipes can create blockages and hinder the operational effectiveness of the system when it is activated.

The designation of 40 degrees as a minimum temperature requirement strikes a balance, ensuring adequate protection for the system’s integrity in conditions often faced in Minnesota's climate. Therefore, having the piping maintained at 40 degrees or higher is a preventative measure that is critical for the reliability and safety of the fire suppression system.