When flowing multiple lines with varying pressures, what should you set your PDP to?

When operating multiple lines with varying pressures, the optimal approach is to set your pump discharge pressure (PDP) to match the line with the highest pressure. This ensures that all lines receive adequate pressure to operate effectively.

By setting the PDP to the highest pressure line, you maintain enough pressure in the system to overcome the friction loss and elevation change for all lines, providing reliability and consistency in water delivery. If the PDP were set to a lower pressure, it could lead to inadequate flow or pressure in one or more of the lines, which could negatively impact performance and the effectiveness of the firefighting operation.

In circumstances where minimum flow is required, this could lead to a dangerous situation if lines are not delivering the necessary flow to effectively combat a fire. Therefore, aligning the system pressure with the highest pressure line is crucial for maintaining operational efficiency and safety.