What is the maximum distance allowed from the end of a 1" branch line to the last hanger?

The maximum distance allowed from the end of a 1" branch line to the last hanger is 36 inches. This requirement is based on the need for proper support and stability of the branch line within the sprinkler system. A 1" branch line typically carries water in a fire protection system, and ensuring adequate support is crucial to prevent sagging or movement, which could compromise the system's integrity and performance.

The 36-inch limit allows for sufficient support while ensuring that the branch lines are appropriately secured without being too restrictive. This distance helps to distribute the loads effectively, preventing undue stress on the piping, which is vital for maintaining the system’s functionality and longevity.

Compliance with this standard helps ensure that all components of the fire suppression system remain in good condition and that they function properly in an emergency. Different materials and pipe sizes often have varying support requirements, and established codes specify these distances to ensure safe installation practices.