What is the friction loss (FL) calculated using the pump chart method with NP = 80?

To determine the friction loss calculated using the pump chart method, it is vital to understand how these values relate to the pump's discharge pressure (NP, or nozzle pressure). In this case, with a nozzle pressure of 80 psi, the friction loss value can be read directly from a properly constructed graph or chart that outlines the relationship between nozzle pressure and friction loss.

When analyzing the pump chart, the specific discharge pressure correlates to a particular friction loss value that varies based on the hose diameter, length, and the flow rate. For a nozzle pressure of 80 psi, the chart typically shows that the friction loss is approximately 170. This value reflects the calculation that considers all the factors affecting the flow in the hose and how they interact with the pressure being exerted.

This method is widely utilized because it provides firefighters with a reliable way to estimate the losses that may occur due to the hose's characteristics when water is flowing through it. Therefore, for the given nozzle pressure of 80 psi, the friction loss resulting from this calculation would rightly be assessed as 170. Understanding this relationship is crucial for effective fireground operations and ensuring the appropriate water supply is maintained.