If a fire hydrant requires a nozzle pressure of 100 psi, what head of water is needed to supply it?

To determine the head of water necessary to supply a fire hydrant that requires a nozzle pressure of 100 psi, it's important to understand the relationship between pressure and head in water systems. The hydraulic head required can be calculated using the formula:

[ \text{Head (ft)} = \frac{\text{Pressure (psi)} \times 2.31}{\text{specific weight of water (lb/ft³)}} ]

Here, the pressure is given in psi. Water's specific weight is approximately 62.4 lb/ft³.

Using this information, we can apply it to find the head:

1. Convert psi to feet of head:

[ \text{Head (ft)} = \text{Pressure (psi)} \times 2.31 ]

Substituting in 100 psi:

[ \text{Head (ft)} = 100 \text{ psi} \times 2.31 ]

[ = 231 \text{ ft} ]

This calculation demonstrates that to achieve a nozzle pressure of 100 psi, a head of 231 feet of water is required. Therefore, the correct answer reflects the necessary hydraulic head to ensure sufficient pressure at the