What additional requirement exists for the installation of dry sprinklers in wet pipe systems protecting refrigerated structures?

In the context of dry sprinklers installed in wet pipe systems that protect refrigerated structures, sealing of clearance space is essential to maintain the operational integrity of the system. Refrigerated environments often experience low temperatures, which can lead to condensation. If clearances are not properly sealed, moisture can accumulate, potentially leading to freezing within the system, which would inhibit proper functioning.

Sealing the clearance spaces around dry sprinklers helps prevent cold air from directly impacting the dry pipe and reduces the risk of temperature fluctuations that could lead to condensation and freezing. This requirement is particularly crucial since any freezing of the pipes could compromise the sprinkler system's ability to discharge water effectively, thereby jeopardizing the fire protection strategy for the refrigerated areas.

By ensuring that these spaces are sealed, the system can maintain a controlled environment ideal for the operation of fire protection systems in refrigerants, thus enhancing safety and compliance with fire codes.