What is the pump discharge pressure when supplying a ground monitor using a 500 GPM fog nozzle with 100 psi nozzle pressure, supplied with two 2 1/2 inch hose lines each 250 ft in length?

To determine the pump discharge pressure when supplying a ground monitor with specific conditions, we need to consider both the nozzle pressure and the friction loss in the hoses.

First, we know that the fog nozzle operates at a nozzle pressure of 100 psi. This is the pressure required at the nozzle to achieve the desired flow rate of 500 GPM.

Next, we have two 2 1/2 inch hose lines, each 250 ft in length. The friction loss for 2 1/2 inch hose can be estimated using a standard formula or chart, which typically estimates friction loss at around 2 psi per 100 feet of hose when flowing at 250 GPM. Since you have two hoses flowing simultaneously, the friction loss will accumulate.

Calculating the friction loss:

• For one hose running 250 ft: 250 ft / 100 ft = 2.5

• Friction loss for one hose: 2.5 x 2 psi = 5 psi

• Since there are two hoses, you would double that amount: 5 psi + 5 psi = 10 psi.

Now, to find the total pump discharge pressure needed, you add the nozzle pressure to the total friction loss:

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