The AFFF system employs which two pump types?

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Study for the DC 311 Aqueous Film Forming Foam (AFFF) Transfer Station Operator Exam. Improve your knowledge with flashcards and multiple choice questions. Understand the concepts with hints and explanations. Prepare thoroughly for your certification!

Multiple Choice

The AFFF system employs which two pump types?

Explanation:
The system needs to handle foam concentrate in a precise way, so it uses two specialized pumps: a proportioning pump and an injection pump. The injection pump moves the foam concentrate from its supply into the water line at the injection point. The proportioning pump meters the concentrate to the correct ratio with the water, ensuring a consistent foam solution across different flow rates. Together, they manage both delivering concentrate and controlling its concentration, which is essential for effective AFFF performance. The other pump pair options describe general pump types that aren’t specific to foam concentrate handling and ratio control.

The system needs to handle foam concentrate in a precise way, so it uses two specialized pumps: a proportioning pump and an injection pump. The injection pump moves the foam concentrate from its supply into the water line at the injection point. The proportioning pump meters the concentrate to the correct ratio with the water, ensuring a consistent foam solution across different flow rates. Together, they manage both delivering concentrate and controlling its concentration, which is essential for effective AFFF performance. The other pump pair options describe general pump types that aren’t specific to foam concentrate handling and ratio control.

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