In dry pipe systems, how should branch lines be pitched in nonrefrigerated spaces?

In a dry pipe system, it's crucial to ensure proper drainage to prevent water accumulation in the branch lines, which could lead to freezing or poor system performance. For nonrefrigerated spaces, pitching the branch lines is essential to facilitate drainage back to the main line or drain points.

The correct answer specifies that branch lines should be pitched at a slope of 1/2 inch per 10 feet. This slope is adequate for allowing any condensation or residual water in the dry pipe system to flow toward the low points of the system and prevent possible freezing in colder conditions.

Additionally, this amount of slope is generally consistent with industry practices and guidelines, ensuring that systems are properly configured to inhibit any issues related to water collection. Proper pitching helps maintain the efficiency and reliability of the dry pipe system as it relieves potential stress caused by stagnant water. Other slope options provided would not effectively support adequate drainage and could lead to unforeseen complications.