How do you determine the approximate total pressure loss (TPL) for a hose assembly with multiple lines?

To determine the approximate total pressure loss (TPL) for a hose assembly with multiple lines, the correct approach is to add the friction loss of all lines and appliances. This method takes into account the cumulative impact of friction loss that occurs as water travels through the various lengths of hose and any attached appliances, such as nozzles, valves, or other equipment.

Each line in the assembly contributes to the overall friction loss based on its diameter, length, and flow rate. By summing these losses, you obtain a more accurate representation of the total pressure loss encountered in the system. This is crucial for ensuring that enough pressure is maintained at the nozzle or discharge point to effectively deliver water.

The other approaches mentioned do not provide a comprehensive understanding of total pressure loss. Evaluating each line's capacity separately may allow for a view of each line's performance, but it does not reflect the overall cumulative effects of friction loss. Accounting only for the longest run of the main line neglects the impacts of the other lines that can also contribute to pressure losses, leading to an underestimation of the total pressure loss. Lastly, while considering the initial pressure at the source is important for determining available pressure, it does not specifically address the friction losses accumulated throughout the hose