What is the maximum distance allowed from the end of a 1 1/2 inch branch line or larger to the last hanger?

In sprinkler fitting, proper support and spacing of pipes are crucial for ensuring system integrity and performance. The maximum distance allowed from the end of a 1 1/2 inch branch line or larger to the last hanger is specified to maintain stability and prevent sagging or movement of the pipe, which can lead to potential leaks or failures in the system.

The correct answer indicates that 48 inches is the maximum acceptable distance. This distance helps ensure that the branch line is adequately supported to withstand various loads, including the weight of the piping, the water contained within, and any additional stresses incurred during operation or maintenance. Proper spacing of hangers is particularly important in larger systems where lines may have considerable lengths and associated weight.

Supporting the piping at appropriate intervals is critical to meet code requirements and ensure safety and reliability in fire protection systems. Thus, this specific distance is a standard code requirement recognized by industry practices, facilitating the long-term functionality of the installed system.