What is the minimum distribution system pressure that should be maintained during firefighting?

Maintaining a minimum distribution system pressure of 20 psi during firefighting operations is crucial to ensure that adequate water supply and pressure are available for firefighting efforts. This pressure level is considered essential for several reasons:

First, a minimum of 20 psi allows for effective water flow from fire hydrants, enabling firefighters to use hoses effectively to combat fires. When pressure drops below this threshold, it can result in insufficient water flow, hampering firefighting efforts and putting lives and property at greater risk.

Second, this pressure level assists in maintaining the integrity of the water distribution system during firefighting activities. Adequate pressure helps prevent the backflow of contaminated water into the system, which could occur if pressure drops significantly.

Finally, maintaining a pressure of at least 20 psi during firefighting aligns with national standards and recommendations from organizations such as the American Water Works Association (AWWA) and the National Fire Protection Association (NFPA). These standards emphasize the importance of ensuring adequate pressure for effective emergency response.

Overall, setting the minimum distribution system pressure at 20 psi allows for a balance between effective firefighting capability and the safety of the water distribution system.