Which hose diameter is used as both supply line and attack handline?

A hose diameter of 2½ inches is commonly used as both a supply line and an attack handline in firefighting operations. This size strikes a balance between versatility and capacity.

When used as a supply line, the 2½-inch hose can deliver a significant amount of water to the fire scene, which is essential for effective firefighting operations. It can also be connected to larger water sources, such as hydrants, to facilitate a strong water supply when required.

As an attack handline, the 2½-inch hose is capable of delivering adequate flow rates to combat various types of fires while being manageable for firefighters. It provides a good combination of flow and control, allowing firefighters to maneuver and apply water effectively.

Other hose sizes have specific uses; smaller hoses like 1 inch are typically used for smaller fires or for overruns where maneuverability and lightweight are prioritized, whereas larger hoses like 3 and 4 inches are usually designated for supply lines or large-scale operations due to the impracticality of handling them in aggressive attack scenarios. Thus, the 2½-inch diameter offers the versatility needed for both functions within firefighting operations.