What is the minimum valve size required for auxiliary drains on wet systems in freezing temperatures?

The minimum valve size required for auxiliary drains on wet systems in freezing temperatures is set at 1/2 inch. This size is crucial because it allows for adequate drainage of water from the system while minimizing the risk of freezing in the pipes. If the drain valve is too small, it may not effectively release the water, which could lead to trapped water that may freeze and cause damage to the system.

In freezing temperatures, ensuring that any residual water can be properly drained increases the system's reliability and longevity. The 1/2 inch size strikes a balance between effective drainage and practicality, making it the most suitable choice for preventing freezing complications in wet sprinkler systems. This guideline is designed to maintain safety and functionality within the systems used for fire protection.