The AFFF Transfer System Stations are normally aligned for what?

• A. Ventilation
• B. Recirculation
• C. Filling
• D. Boost pressure

Answer: (B)

In AFFF transfer systems, the stations are normally kept in a recirculation loop to keep the foam concentrate moving and well mixed. This continuous loop prevents solids from settling, avoids concentration stratification, and keeps the solution uniform so the foam mix is consistent whenever you need to dispense. Recirculation also helps prime the pump and maintain a steady flow, reducing delays when you call for foam.

Ventilation and filling paths are used for specific operations, and boosting pressure is about pushing the solution through lines at higher pressure. Those modes aren’t the default because they don’t keep the concentrate ready and evenly mixed the way recirculation does.