When using a pump chart, what must a driver/operator do after accounting for the number of feet in the layout?

Using a pump chart involves a systematic approach to determine the necessary pump discharge pressure based on the specifics of the layout. After accounting for the number of feet in the layout, the process of plotting where each column intersects to find the required pump discharge pressure allows the operator to precisely identify the appropriate pressure needed for effective pump operation.

Plotting involves cross-referencing the distance laid out with other factors such as hose diameter, elevation changes, and friction loss, which are also represented in the chart. This intersection point reveals the discharge pressure necessary to ensure adequate water flow at the designated distance, accounting for all contributing variables. By accurately interpreting these intersections, the driver/operator can ensure they are providing the right pressure to effectively deliver water throughout the system, maintaining efficiency and safety.

Other methods, such as reading across a row or performing calculations, may not provide the same level of accuracy if the relationship between variables isn't visually interpreted. Hence, plotting the columns and finding their intersections ensures a more reliable and comprehensive understanding of how all the factors come together in practical application.