What does friction loss in a hose affect during firefighting operations?

Friction loss in a hose significantly impacts water pressure during firefighting operations. When water flows through a hose, it encounters resistance due to the internal surface of the hose and any bends or fittings it may have. This resistance creates friction loss, which decreases the water pressure at the nozzle compared to the pressure at the pump.

Maintaining adequate water pressure is crucial for effective firefighting, as it ensures that enough water can be delivered to extinguish the fire, reach the required height or distance, and effectively create a water stream. If friction loss is not taken into account, firefighters may find that the pressure available for use at the nozzle is insufficient, which can hinder their ability to combat a fire effectively.

While the flow rate can also be influenced by friction loss, the primary and most direct impact is on water pressure, since pressure must be sufficient to create an effective flow rate at the nozzle. Therefore, recognizing the importance of managing friction loss is essential for firefighters to ensure adequate water supply and pressure during emergency operations.