BPPS stands for what in the AFFF system?

• A. Balanced pressure proportioning system
• B. Basic pressure proportioning system
• C. Balanced prime proportioning system
• D. Boiler pressure proportioning system

Answer: (A)

Balanced Pressure Proportioning System is the way the AFFF system mixes foam concentrate with water at a fixed ratio, no matter what the supply pressures are. The proportioning device maintains a pressure balance between the water side and the concentrate side, so the foam concentrate is drawn in and metered accurately into the water stream. This keeps the foam solution at the correct dilution to produce effective film-forming foam during firefighting. The idea is to stay constant with changes in system pressure, preventing under- or over-dilution. The other terms don’t fit because they omit the essential balance and the emphasis on proportioning the foam into the water stream.