What is the formula to calculate friction loss (FL) for hose?

The formula to calculate friction loss (FL) for hose is represented by FL = CQ²L. In this formula, 'C' stands for the coefficient of friction for the type of hose being used, 'Q' represents the flow rate in gallons per minute, and 'L' denotes the length of the hose in hundreds of feet. This equation reflects how friction loss in a hose is influenced by both the flow rate and the length of the hose.

This is particularly important for fire rescue operations where understanding fluid dynamics can directly impact water pressure, delivery capabilities, and overall firefighting effectiveness. As flow (Q) increases, the friction loss increases exponentially (since it's squared), emphasizing the importance of managing flow rates and hose lengths in tactical situations.

In contrast to the other options presented, they either correspond to incorrect relationships or do not follow the established principles of hydraulics as specifically related to friction loss in hoses. The FL = CQL⁴ and FL = CQL³ options suggest a much more pronounced increase in friction loss relative to the length of the hose than is typically experienced in practice, while FL = CQT² does not differentiate between the influence of flow rate and hose length appropriately for hose friction loss calculations.