What is the recommended minimum pressure for water coming from a fire hydrant?

The recommended minimum pressure for water coming from a fire hydrant is significant because it directly affects a fire department's ability to effectively tackle fires. A pressure of 138 kPa (20 psi) is considered to be the minimum threshold needed to ensure that sufficient water is delivered for firefighting operations. At this pressure level, firefighters can begin to utilize the flow of water effectively for suppression efforts in various situations.

This pressure allows systems to maintain an adequate flow rate for firefighting equipment, such as hoses and nozzles, enabling the necessary volume and velocity of water to combat fires. If pressure drops below this threshold, it may compromise the efficiency and safety of firefighting tactics, resulting in inadequate water supply for extinguishing flames or creating effective streams.

Therefore, maintaining a minimum hydrant pressure of 138 kPa is essential for fulfilling the operational needs of firefighting and ensuring public safety.