What is the required pitch for dry system branch lines per NFPA 13?

The required pitch for dry system branch lines as specified by the NFPA 13 standard is 1/4 inch per 10 feet. This slight slope is crucial for ensuring that any condensation that may form within the branch lines can effectively drain back towards the dry pipe valve. By maintaining a proper pitch, it minimizes the risk of water accumulation within the system, which can lead to freeze-related issues or malfunctions when the system is activated.

In practice, a consistent pitch across branch lines provides a structured path for potential water flow, enhancing the overall reliability of the dry system in fire protection. Proper installation practices, including adhering to this specific pitch, are fundamental in ensuring the system’s effectiveness in safeguarding property and lives against fire hazards.