What is the formula for calculating Friction Loss (FL)?

The formula for calculating Friction Loss (FL) is FL = C(Q/100)² X (L/100), which accurately represents how friction loss is influenced by both the flow of water through the hose and the length of the hose itself.

In this formula, "C" represents the friction loss coefficient that varies based on the size and condition of the hose. The term (Q/100)² demonstrates that the friction loss increases with the square of the water flow rate, denoting that as more water flows through the hose, the frictional resistance increases disproportionately. This highlights the critical importance of flow rate when planning water supply for firefighting efforts.

The (L/100) component indicates that friction loss is also directly proportional to the length of the hose. As the distance increases, there is more surface area in contact with the water, leading to greater friction loss.

Overall, this relationship emphasizes the combined effects of flow rate and hose length on friction loss, allowing firefighters and engineers to more accurately calculate and prepare for the pressures needed for effective water delivery.