If the TLI is at 95%, can the AFFF system operate?

If the TLI is at 95%, can the AFFF system operate?

• A. Yes, it will still operate as long as AFFF is present
• B. No, it must be at 100%
• C. Only if Firemain pressure is correct
• D. Only if the pump is on

Answer: (A)

The system’s ability to operate hinges on having foam concentrate available, not on being at a literal full 100% reading. A Tank Level Indicator of 95% shows there’s still plenty of AFFF in the tank, so the foam system can function as long as concentrate is present. The 100% mark isn’t a requirement for operation, and Firemain pressure isn’t the gating factor for this scenario—the foam can be delivered once the concentrate is there, assuming the pump is commanded to run as part of normal operation. In short, presence of AFFF is what matters, and 95% indicates enough concentrate to proceed.

The system’s ability to operate hinges on having foam concentrate available, not on being at a literal full 100% reading. A Tank Level Indicator of 95% shows there’s still plenty of AFFF in the tank, so the foam system can function as long as concentrate is present. The 100% mark isn’t a requirement for operation, and Firemain pressure isn’t the gating factor for this scenario—the foam can be delivered once the concentrate is there, assuming the pump is commanded to run as part of normal operation. In short, presence of AFFF is what matters, and 95% indicates enough concentrate to proceed.