For horizontal piping extending more than 18 inches, what is required?

For horizontal piping extending more than 18 inches, the requirement for hangers is crucial to ensure structural integrity and proper support of the piping system. Hangers are necessary to hold the pipes in place, preventing them from sagging or bending under their own weight or due to other external forces. This support helps maintain the alignment of the pipe, minimizes stress on joints and fittings, and reduces the risk of damage or failure, ensuring a reliable and efficient sprinkler system.

While insulation, painting, and unsupported conditions may have their own considerations in specific scenarios, they do not address the fundamental need for proper mechanical support of long horizontal piping runs. Insulation is typically used to prevent heat loss or condensation but is not a substitute for structural support. Overall, proper use of hangers not only complies with industry standards and codes but is essential for operational safety and performance in sprinkler systems.