How many injection pumps are on board?

How many injection pumps are on board?

• A. 10
• B. 15
• C. 20
• D. 25

Answer: (C)

The important idea here is how AFFF systems are designed to deliver foam reliably across the entire installation. Injection pumps are the devices that introduce foam concentrate into the foam-making water stream, and you need enough of them to cover all zones and keep the correct concentrate-to-water ratio even if one pump isn’t available. Why the chosen number fits best is that it reflects a system laid out for full coverage and redundancy. With a larger, multi-pump setup, you can run multiple injection points in parallel, ensure the flow rate stays above the required level for rapid foam generation, and still have backups if a pump trips out or is taken offline for maintenance. This kind of design keeps the foam system effective in all areas it serves and reduces the risk of a shortfall during a response. In contrast, smaller counts would risk undersupply or limited redundancy, while an excessively large count could be unnecessary for the station’s size and add maintenance burden. The listed configuration balances capacity and reliability for the transfer station’s AFFF system, which is why the higher count is the correct interpretation.

The important idea here is how AFFF systems are designed to deliver foam reliably across the entire installation. Injection pumps are the devices that introduce foam concentrate into the foam-making water stream, and you need enough of them to cover all zones and keep the correct concentrate-to-water ratio even if one pump isn’t available.

Why the chosen number fits best is that it reflects a system laid out for full coverage and redundancy. With a larger, multi-pump setup, you can run multiple injection points in parallel, ensure the flow rate stays above the required level for rapid foam generation, and still have backups if a pump trips out or is taken offline for maintenance. This kind of design keeps the foam system effective in all areas it serves and reduces the risk of a shortfall during a response.

In contrast, smaller counts would risk undersupply or limited redundancy, while an excessively large count could be unnecessary for the station’s size and add maintenance burden. The listed configuration balances capacity and reliability for the transfer station’s AFFF system, which is why the higher count is the correct interpretation.