In terms of distance, how far from the end may the last support hanger on a fire sprinkler branch of 1 inch nominal pipe size be?

The correct distance for the last support hanger on a fire sprinkler branch of 1 inch nominal pipe size being 36 inches aligns with industry standards and codes governing the installation of fire sprinkler systems. Proper support is essential to ensure that the pipe is secure and to prevent sagging or stress that might damage the piping and affect system performance.

In the context of sprinkler systems, the relevant regulations specify that for a pipe of this size, the maximum distance between hangers should not exceed 36 inches. This requirement helps maintain not only the structural integrity of the sprinkler system but also optimizes its function by ensuring that water discharge is uniform and effective when activated.

Support hangers are crucial for facilitating proper alignment and positioning of the sprinkler piping, mitigating potential vibrations, and managing thermal expansion. Thus, the 36-inch spacing is a standard that balancing these safety and operational needs within fire protection systems.