In firefighting, what does the term "friction loss" refer to?

The term "friction loss" specifically refers to the pressure loss that occurs as water flows through hoses and fittings. This loss is primarily due to the resistance imposed by the internal surfaces of the hose, which creates turbulence and impedes the smooth flow of water. The longer the hose and the smaller the diameter, the greater the friction loss tends to be.

Understanding friction loss is crucial for fire apparatus operators because it directly impacts the pressure available at the nozzle. Accurate calculations of friction loss help ensure firefighters receive an adequate flow of water to effectively extinguish a fire. Factors such as hose diameter, length, and type of material also influence the total friction loss that must be accounted for in firefighting operations, making this knowledge vital for maintaining effective water supply and pressure during firefighting efforts.