What is the minimum nozzle pressure for solid-stream nozzles during handline operations?

For solid-stream nozzles during handline operations, the minimum nozzle pressure is established to ensure effective water flow and reach for extinguishing fires. A minimum pressure of 50 psi is considered optimal, as it balances the need for sufficient velocity to carry the water stream to the target while also ensuring adequate penetration into the fire environment. This pressure ensures that the water reaches the desired distance and maintains an effective firefighting stream.

Using a pressure lower than 50 psi may result in a stream that lacks the necessary force to reach the target effectively, potentially diminishing the effectiveness of the firefighting effort. Higher pressures could increase the risk of control issues or unnecessary water application, leading to complications in the firefighting process. Therefore, 50 psi is the standard minimum pressure that allows firefighters to operate safely and effectively with solid-stream nozzles during handline operations.