Why should 5" hose not be used to supply a F.D.C. connection?

Using 5" hose to supply a Fire Department Connection (F.D.C.) is discouraged primarily due to the risk of exceeding the pressure capacities of the system. The 5" hose typically has a higher flow rate, which can lead to increased pressures that may exceed the design limits of the F.D.C. and associated piping infrastructure. When pressures become too high, there is a significant risk that fittings, valves, and other components could fail, leading to potential leaks or catastrophic failures during firefighting operations.

This concern is not just theoretical; it has practical implications in the field. Ensuring that the correct size of hose is used helps to maintain safe operating pressures and promotes reliable water supply during emergency situations. Proper understanding of the hydraulic principles involved is critical for driver engineers to effectively manage water supply operations without compromising safety or equipment integrity.