Which system must protect the dry pipe valve and supply pipe from freezing conditions?

The dry pipe system is specifically designed to address situations where the risk of freezing is a concern. In this type of system, the piping is filled with air or nitrogen rather than water. The dry pipe valve holds back the water supply until a fire is detected and a sprinkler is activated. Since the piping does not contain water under normal conditions, it minimizes the risk of freezing.

However, it is still essential to protect the dry pipe valve and the supply piping from freezing temperatures to ensure that the system functions properly when needed. If the valve or pipes freeze, the system may not be able to deliver the water required to extinguish a fire. Therefore, maintaining a temperature above freezing around the components of a dry pipe system is crucial for its operational reliability.

In contrast, wet pipe systems are filled with water at all times and do not face the same freezing concerns as dry pipe systems do. Deluge and pre-action systems can have different operational characteristics, and while they may also need protection in certain conditions, they each address fire suppression in unique ways that do not solely focus on the risks of freezing water in pipes.