MEGA Corp. MTT-OPS-1 - Manual (Page 23)

MTT-OPS-1
13 Nov 2013
SECTION 2
System Description
2-14
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 monitor nozzle if the
monitor 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.