What is the friction loss for 5" LDH at 1000 GPM?

The correct value for friction loss in 5" large-diameter hose (LDH) at a flow rate of 1000 GPM is indeed 5 psi per 100 feet. This figure is critical for fire service operations because it helps calculate the pressure needed at the pump to ensure efficient water delivery to the nozzle or riser, facilitating effective firefighting tactics.

Understanding that friction loss increases with the length of hose run and flow rate is crucial for any fire engineer. For a larger hose size like 5" LDH, the lower friction losses compared to smaller hoses enable the fire service to move larger volumes of water with less pressure loss, enhancing overall efficiency during operations.

Friction loss tables, derived from empirical data and hydraulics principles, provide these standard values, which are essential for planning and executing fire suppression strategies. The other options do not align with the recognized friction loss standards for this size of hose at the specified flow rate.