Most smooth-bore nozzles are designed to operate at which pressure?

Smooth-bore nozzles are typically designed to operate efficiently at a pressure of 50 psi (345 kPa). This operating pressure is optimal for providing a solid stream of water which is essential for effective firefighting. At this pressure, the nozzle can create a wide yet powerful stream that maximizes reach and penetration into the fire environment.

Using a higher pressure could increase the velocity of the water stream, but it might also lead to difficulties in controlling the nozzle and reduce the effectiveness of the application by producing excessive mist or spray instead of a solid stream. Consequently, the design standard for many smooth-bore nozzles is set at that 50 psi to balance performance, control, and effective water delivery.