Section III. PRINCIPLES OF OPERATION
1-8 FIRE SUPPRESSION EQUIPMENT SET
The Fire Suppression Equipment Set is a self-contained unit used to extinguish fuel fires and seal against re-
ignition. It is to be kept m a ready status at all times when not in use. It must be ready to use quickly with a minimum
amount of time or effort.
Two storage tanks hold the fire-fighting agents, one for the dry chemical and one for the AFFF. When used, the
storage tanks are pressurized independently from nitrogen cylinders using quick-opening lever valves. The cylinder
pressure is reduced with pressure regulators and check valves prevent the fire-fighting agents from backing up into the
Each storage tank has a discharge ball valve that is opened to quickly allow the fire-fighting agents to pass
through the 150 foot long hoses stored on the hose reel.
The fire hose nozzle assembly controls the flow of fire-fighting agents from the hose line. The operator squeezes
a trigger lever to discharge either agent independently onto the fire.
A heater is used around the AFFF storage tank to heat it if the tank temperature drops to 40° F (4° C). This is to
keep the liquid agent m a fluid state.
1-.9. AUXILIARY CART.
The auxiliary cart carries additional hose line (150 feet) (46 meters) that can be attached to increase the