MAC/MTT-OPS-1
26 FEB 2019
SECTION 2
System Description
2-23
HOSE REEL
A reel assembly that is located on the bottom aft
end of the water tank fitted with a 1” or 1.5”
diameter reinforced rubber hose and a fire fighting
style nozzle. The hose reel assembly receives
pressurized water from the pressurized manifold
on the back of the tank to operate.
TANK DRAIN
A hydraulic BFV attached to the water tank
pressure pipe is used to drain water from the water
tank. The BFV is controlled electrically from the cab
control box and is actuated by a hydraulic actuator.
The actuators receive hydraulic pressure from the
solenoid control box assembly. Tank drains can be
either gravity or pressure fed.
FIRE SUPPRESSION SYSTEM
A system that consists of a 120 or 60 gallon
stainless steel holding tank, an electric or
pneumatic actuated shut-off valve, in-cab control
switch, hosing and a foam eduction nozzle
mounted to the water cannon.
Foam Concentrate Tank
A stainless steel tank
mounted in the forward
upper portion of the water
tank. The holding tank
contains a supply tube
that extends to the
bottom of the tank and
connected to a flexible hose at the top of the tank
and then routed to the foam agent shut-off valve.
The tank also contains a pressure/vacuum cap
which keeps foreign matter out of the tank while
providing for pressure relief and air displacement
during temperature changes.
Electric/Pneumatic Shut-off Valve
The in-line shut-off valve is mounted on the foam
tank upper lip and is controlled by the in-cab
control FOAM switch. The shut-off valve is
actuated by either an electric or pneumatic
actuator that is controlled by the in-cab control
switch. Once the shut-off valve is opened, foam
concentrate will flow from the holding tank to the
water cannon nozzle if the water cannon and
water pump switches are ON.
Foam Eduction Nozzle
A manual or remote
adjustable (fog/stream)
nozzle is attached to the
water cannon waterway.
The nozzle inner housing
uses monitor high pressure
water to create a venture
effect that will create a
suction force that pulls foam concentrate from the
holding tank. Once foam concentrate is flowing,
the nozzle proportions foam concentrate, water
and air to produce finished foam. The nozzle can
be adjusted to allow control of foam solution at a
rate of 1%, 3% or 6%. Rate adjustment is obtained
by replacing a removable disk.
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