What impact does hose length have on friction loss?

• A. Longer hoses decrease friction loss
• B. Longer hoses increase friction loss
• C. Hose length has no effect on friction loss
• D. Friction loss decreases in shorter hoses

Answer: (B)

Hose length has a significant impact on friction loss in fire suppression systems and related applications. The fundamental principle at play is that as the length of a hose increases, the surface area in contact with the water also increases. This results in greater friction between the flowing water and the inner walls of the hose. Such friction leads to energy loss, which manifests as a decrease in the pressure available at the nozzle or discharge end of the hose.

In firefighting scenarios, understanding this concept is critical for effective operation. Longer hoses require higher pressures to deliver the same flow rate at the nozzle compared to shorter hoses. Thus, the relationship between hose length and friction loss is direct: longer hoses will indeed increase friction loss, making it essential for pumper drivers/operators to calculate and account for this when planning their water supply and deployment strategy.