What type of systems are installed where a wet pipe system cannot be heated to prevent freezing?

A dry pipe system is specifically designed for environments where temperatures could drop low enough to cause water in the pipes to freeze. In a dry pipe system, the pipes are filled with pressurized air, and water is only released into the system when the system is activated by a fire. This activation occurs when a heat-sensitive device, such as a sprinkler head, opens due to the presence of heat from a fire, allowing the air pressure to drop, which in turn opens the dry pipe valve and lets water flow into the system.

This is different from other systems, such as wet pipe systems, where pipes are filled with water at all times. Wet pipe systems are not suitable in freezing conditions because there is a high risk of the water freezing in the pipes, leading to potential failure when needed in an emergency.

Deluge systems, which are also not designed for freezing conditions, consist of open sprinklers that release large amounts of water immediately but are not the correct choice for freezing environments found in dry pipe systems. Pre-action systems, while also used to prevent freezing, often require an additional activation step and can still be susceptible to freezing if not designed with adequate heating or insulation.

Thus, for situations where there is a risk of freezing, the most appropriate