When fighting a fire using the M12A1 PDDA, stand at a safe distance
upwind from the fire. If the fire is not spreading, start at the base of the
fire and cover it with foam. If the fire is spreading, encircle the fire with
foam to stop the spread and then cover it with foam. Be very careful to
keep the hose out of the fire. If the foam is discharged at too great a
pressure, it can spread the fire. If this occurs, tell the individual at the
control panel to reduce the pump engine speed.
When the fire fighting mission is completed and the fire is extinguished or controlled, clean, service, and
stow the components as described in earlier lessons.
Learning Event 3
In decontamination operations, the decontaminant that will probably be used most often is supertropical
bleach (STB). A full load of slurry (317 gallons) requires 26 cans (1300 pounds) of STB, 225 gallons of
water, 12.5 pounds of M2 antiset, and 24 ounces of silicone antifoam agent.
NOTE: If less than 317 gallons of slurry is required, decrease all ingredients proportionately. For
example, if one half-load (158 gallons) of slurry mix is to be prepared, use approximately 115
gallons of water, 650 pounds of STB decontaminating agent, 6.5 pounds of antiset compound,
and 12 ounces of silicone antifoam agent.
PREPARE TO LOAD DECONTAMINANTS
In preparation for loading, mixing, and spraying decontaminants, you must place 225 gallons or the
desired amount of water in the tank unit assembly (check the tank liquid level indicator; No 1 in figure
37), make the appropriate hose connections (these connections are depicted in Figure 37), prime and
start the pump. The hose connections to make are --
o Connect the suction hose (2) to the tank drain valve (3) and the connection on the pump unit (4).
o Connect the agitator-blender hose (5) to the pump unit (4) top discharge connection and to the tank
unit blender pipe (6).