ΙΙ
-16
ROTARY GEAR PUMP
ELECTRONIC FOAM PROPORTIONING SYSTEM
Section
ΙΙ
ΙΙΙΙ
ΙΙ
ΙΙ
: Installation
purpose, or a manifold can be designed
and constructed by the system installer.
CAUTION:
The Hale HPF flowsensor is
assembled and tested at the factory.
Removal of the sensor from the tee is not
necessary or recommended for
installation in the system.
It is not necessary to remove the sensor from
the flowsensor tee for installation. If removal
is necessary refer to figure 2-11 for guidance
in disassembly of the flowsensor. After
installation of the flowsensor tee is complete
the sensor must be inserted back into the
tee if it was removed. Make sure the two o-
rings are in the grooves on the sensor
before inserting into the tee. After the
sensor is seated in the flowsensor tee it must
be locked in place using the locking pin
and locknut provided. The locknut must be
tightened handtight only. (See figure 2-11)
FOAM PUMP FLUSH SYSTEM
When dual foam tanks are installed on the
apparatus, flushing water must be provided
to flush the system of foam concentrate
after use of some foam concentrate types
to prevent possible reactions. The Hale ADT
and Hale MDT
II
each have provisions for
connecting flushing water to the foam
concentrate injection system.
If a single foam concentrate tank system is
installed on the apparatus the Hale MST
provides a selector valve and gives the
system flush capabilities for NFPA
compliance. A fitting provided on the Hale
MST makes connection of flushing water
simple.
When the Hale FoamMaster is installed with
the "no tank" option the system installer must
provide flushing water supply to comply
with NFPA standards.
Flushing water hose should have a minimum
of ½ inch (12 mm) inside diameter and be
capable of withstanding the maximum fire
pump discharge pressure, 500 PSI (34 BAR)
minimum. The flush water supply should be
provided from one of the pressure taps on
the discharge of the fire pump. Flush water
thread connections on the ADT are ½ inch
NPT and on the Hale MDT
ΙΙ
and Hale MST
they are ¼ inch NPT. The system installer
must provide proper fittings for these
connections.
FOAM CONCENTRATE PLUMBING
Foam concentrate plumbing consists of the
foam concentrate suction hose, foam
strainer, foam concentrate discharge hose
and check valve/injector fitting.
CAUTION:
Make sure the foam tank and
foam concentrate suction hoses are
Figure 2-11. Flowsensor Sensor Service
WATER FLOW DIRECTION
➭
➭
➭
➭
➭
FLOWSENSOR
TEE
LOCKING
PIN
O-RINGS
SENSOR
GROUND WIRE
CONNECTION
TERMINAL AND
SCREW
LOCKNUT