What pressure is needed to flow 266 GPM using a 2 ½" 200' High-rise pack with a 1 1/8" SB nozzle?

To determine the correct pressure needed to flow 266 gallons per minute (GPM) using a 2 ½" high-rise pack with a 1 1/8" smoothbore nozzle, it's important to apply the appropriate formulas that account for the flow characteristics and nozzle requirements.

The flow through a nozzle can be calculated using the formula:

[

P = \frac{(Q^2)}{(C^2)}

]

Where:

• (P) is the nozzle pressure in psi,

• (Q) is the flow in GPM,

• (C) is a constant based on nozzle size. For a 1 1/8" smoothbore nozzle, (C) is typically around 29.

When flowing 266 GPM through a 1 1/8" nozzle, the required nozzle pressure is calculated and additional factors such as friction loss due to the length of the hose (200' in this case) are considered. The friction loss can be calculated using industry-standard formulas for hose diameter and length.

In this case, once the total friction loss and the nozzle pressure have been accounted for, the resulting pressure that needs to be achieved at the pump discharge to ensure