At what maximum pressure should solid stream nozzles on handlines generally be operated?

Operating solid stream nozzles on handlines at a maximum pressure of 50 psi (350 kPa) is considered a standard practice in firefighting. This pressure allows for a balance between effective water flow and manageable nozzle handling by the operator. At this pressure, the nozzle can deliver an adequate stream for effective firefighting while ensuring that the operator can control the nozzle without excessive recoil or difficulty.

Running solid stream nozzles at higher pressures, such as 80 psi, can lead to increased strain on both the equipment and the firefighter, contributing to potential fatigue and decreased operational effectiveness. Lower pressures, like 20 psi or 30 psi, do not provide sufficient velocity and reach for effectively combating fires, limiting the nozzle's operational capabilities in real-world firefighting scenarios.

Therefore, maintaining a maximum pressure of 50 psi ensures both operational efficiency and safety for personnel, making this the appropriate choice.