Low energy foam systems use what solely to impart pressure on the foam solution?

• A. A fire pump
• B. A foam eductor
• C. A water canister
• D. A hydraulic ram

Answer: (A)

Low energy foam systems rely on the water pressure from the fire pump to push the foam concentrate into the water stream. The foam eductor (or foam nozzle) uses that pressurized water flow to entrain the concentrate and mix it with the water, but it does not supply the pressurizing energy on its own. In this setup, the pump discharge provides the pressure that drives the foam solution, while the eductor simply creates the suction needed to pull the concentrate into the stream. That’s why the fire pump is the sole source imparting pressure to the foam solution in these systems.