At what flow rate does a 5-inch LDH experience 8 psi of friction loss per 100 feet?

The flow rate at which a 5-inch large diameter hose (LDH) experiences 8 psi of friction loss per 100 feet is associated with established hydraulic principles. Friction loss in hoses is influenced by both the diameter of the hose and the flow rate; generally, as flow velocity increases, friction loss also increases.

For a 5-inch LDH, a flow rate of 1,000 gallons per minute (gpm) is typically referenced in hydraulic calculations as producing around 8 psi of friction loss per 100 feet. This is an established rule of thumb used by firefighters and emergency responders to plan effective water delivery and ensure efficient operations at the scene of a fire.

The other flow rates such as 500 gpm, 1,500 gpm, and 2,000 gpm would correspond to different friction losses that either fall below or exceed the specified 8 psi per 100 feet. Specifically, lower flow rates usually lead to lower friction loss, and higher flow rates significantly increase friction loss beyond 8 psi due to the higher velocity and turbulence in the hose.

Understanding this relationship enables firefighters to strategize their water supply logistics effectively, ensuring they can deliver the necessary water volume while managing the pressure involved in their operations