What is the pump discharge pressure for a multiversal master stream with a 2-inch tip and two 3-inch lines flowing 400 feet into it?

To determine the correct pump discharge pressure for a multiversal master stream, you must consider the flow through the nozzle and the friction loss in the supply lines.

When calculating the necessary pump discharge pressure, we can use the formula that accounts for nozzle pressure and friction loss. The essential factors here include:

1. Nozzle Pressure: This is typically provided for specific nozzle sizes. For a 2-inch tip, the nozzle pressure is usually around 80 psi for effective operation.

2. Friction Loss: The friction loss needs to be calculated based on the size and length of the hoses used. According to the standard formulas, a 3-inch line generally has a friction loss of approximately 0.2 psi per 100 feet of hose at 1000 gpm. For two lines running 400 feet each, the total length is 800 feet. The friction loss formula is:

• Friction Loss = (Length in hundreds of feet) x (Friction loss per 100 feet)

• Therefore, for the two 3-inch lines, the calculation would be:

• Friction Loss = 8 x 0.2 psi = 1.6 psi per line, multiplied by 2 lines gives a