What is the required nozzle pressure for the 1 ¾" courtyard hose pack?

The required nozzle pressure for the 1 ¾" courtyard hose pack is 90 psi. This pressure is determined based on the typical operational requirements for effective firefighting using this specific size of hose. The 90 psi nozzle pressure is optimal for ensuring an adequate stream while maintaining adequate flow and reach, which are critical for suppressing fires in various environments, such as courtyards where maneuverability may be limited.

It's important to recognize that the pressure must be sufficient to overcome any friction loss due to the hose length and the dynamics of the firefighting operation, as well as to provide the necessary water coverage for effective firefighting. The established standard of 90 psi ensures that firefighters can deliver a strong, consistent stream to combat fire effectively.

This nozzle pressure is often used in training and operational guidelines, helping to standardize practices among firefighters. The other listed pressures either do not match the established requirements for effective firefighting with this size hose or could compromise the effectiveness of the hose stream under various firefighting circumstances.