Why is it important to exceed 40 GPM in the foam system?

Exceeding 40 GPM (gallons per minute) in the foam system is crucial to ensure effective foam application. Foam systems are designed to achieve a specific flow rate to properly generate and distribute foam across the targeted area. When the flow rate is too low, the foam may not be produced with the correct consistency or quantity, which can lead to ineffective coverage and ultimately diminish the firefighting capabilities of the foam.

A flow rate above 40 GPM helps to achieve adequate turbulence, which is necessary for proper mixing of air and foam concentrate. This mixing is critical in creating a quality foam that can effectively blanket flammable liquids, suppress vapors, and ultimately extinguish the fire. Therefore, maintaining a flow rate above this threshold enhances the performance and reliability of the foam system in fire suppression operations.