What is the formula for calculating friction loss (FL) using the coefficient method?

The formula for calculating friction loss (FL) using the coefficient method is derived from the relationship between the flow rate, the length of the hose, and the coefficient that accounts for the characteristics of the hose used.

In this formula, FL = C X Q² X L, each element has its significance: C represents the coefficient of the hose, Q is the flow rate in gallons per minute (GPM), and L is the length of the hose in hundreds of feet. The flow rate is squared in this equation, indicating that friction loss increases significantly with higher flow rates. This relationship emphasizes the dramatic effect that increased flow has on friction loss, highlighting the principles of fluid dynamics where an increase in velocity leads to exponentially higher friction loss due to the interaction of the fluid with the walls of the hose.

Understanding this formula is crucial for fire rescue operations, as it allows drivers and engineers to effectively calculate the pressure needed to maintain adequate water flow during firefighting efforts, leading to more efficient and safe operations.