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 0031 00
TM 55-1925-273-10-1
AQUEOUS FILM FORMING FOAM (AFFF) PUMP
The AFFF pump (figure 5) is located in AMS 1. It is a horizontal gear pump with a rated capacity of 60 gallons
(227.1 liters) per minute. Normal operating pressure is 125 PSI (8.6 bar). The AFFF pump is part of a system that
includes a ready service tank, the AFFF pump, a proportioner, and piping specifically suited for the delivery of AFFF.
AFFF can only be expended from the fire monitors. AFFF is stored in its own tank in concentrate form. The pump is used
to force AFFF concentrate through the proportioner into the fire main at a rate of 6 parts foam concentrate to 94 parts raw
water. When in use, the 525-gallon tank is capable of producing 13,344 gallons of AFFF. One or more fire monitors
shooting AFFF will expend the ready service tank in less than nine minutes.
Figure 5. AFFF Pump
DIESEL ENGINE-DRIVEN FIREFIGHTING PUMP
The diesel engine-driven firefighting pump (figure 6) is located in AMS 1. Its rated capacity is 1000 gal/min (3785 L/min)
with a discharge pressure of 125 PSI (8.6 bar). Its primary purpose is to provide raw water to the fire monitors. The
secondary purpose of the pump is to pressurize the fire main and general service system in the event of a malfunction of the
fire and general service pumps.
Figure 6. Diesel Engine-Driven Firefighting Pump
0031 00-6
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