What is the recommended nozzle pressure for smooth bore master streams?

The recommended nozzle pressure for smooth bore master streams is 80 psi because this pressure is optimal for maximizing flow while maintaining effective reach and penetration of the water stream. Smooth bore nozzles are designed to produce a straight, solid stream of water, which is particularly useful for suppressing fires in various environments, including structural fires and wildland firefighting situations.

Operating at 80 psi allows firefighters to achieve a balance where the water stream travels effectively to the target, helping to ensure that more water reaches the desired area to combat the fire. If the nozzle pressure is too low, the stream may lack the necessary force to reach the fire effectively. Conversely, if the pressure is set too high, it may lead to excessive turbulence within the stream, which can reduce the effectiveness of the water application and create unnecessary safety hazards.

Understanding the proper nozzle pressure is essential for fire apparatus operators, ensuring they can deliver the appropriate fire suppression capabilities during emergencies.