You are pumping into a pre-piped tower operating 80 feet above your pump with a 1 3/8 inch tip. What is your discharge pressure when using two 3-inch lines, each 100 feet long?

To determine your discharge pressure in this scenario, the necessary components to consider include the vertical lift, friction loss in the hoses, and the nozzle pressure requirement.

First, the vertical lift needs to be accounted for since you are pumping into a tower 80 feet high. The pressure required to lift water vertically can be calculated using the formula:

Pressure (in psi) = Height (in feet) / 2.31.

So for an 80-foot lift, the pressure required would be:

80 feet / 2.31 = approximately 34.6 psi.

Next, you must calculate the friction loss in the two 3-inch lines. For a 3-inch hose, a standard friction loss calculation is about 0.5 psi per 100 feet of line at 100% flow capacity. For two lines, the friction loss will be the sum of the losses from each line:

0.5 psi x 2 (for the two lines) = 1 psi per 100 feet.

Thus, for two 100-foot lengths, the total friction loss due to the hoses would be minimal, only contributing an additional 1 psi.

Next, you must consider the nozzle discharge requirement at the tip, which typically requires a certain