How do you calculate friction loss in a hose?

To calculate friction loss in a hose, you rely on specific formulas that take into account the diameter of the hose, the length of the hose, and the gallons per minute (GPM) flow rate of water. This approach is based on established hydraulic principles and provides a systematic way to quantify the friction loss that occurs as water moves through the hose.

Using hose diameter is critical because friction loss is directly related to the cross-sectional area of the hose; larger diameter hoses typically have less friction loss compared to smaller diameter hoses. The length of the hose also plays a significant role, as longer hoses contribute more friction loss due to the increased surface area that the water comes into contact with. Finally, the flow rate measured in GPM affects the velocity of the water, which is also a key factor in determining friction loss.

By combining these elements, firefighters can accurately estimate the pressure drop due to friction, enabling them to make informed decisions about pump operations and ensure adequate water pressure reaches the nozzle.