ΙΙ
-13
ROTARY GEAR PUMP
ELECTRONIC FOAM PROPORTIONING SYSTEM
Section
ΙΙ
ΙΙΙΙ
ΙΙ
ΙΙ
: Installation
in figure 2-7. DO NOT let the flowsensors
rotate more than 85
o
in either direction for
proper operation.
When selecting flowsensors it is important to
consider the minimum and maximum flow
requirements during operation, not the
piping size being used as one flowsensor
MAY NOT cover the entire range of system
flows. Refer to the flowsensor selection
chart in Section
Ι
of this manual for proper
flowsensor sizing and installation dimensions.
When a single flowsensor is installed in the
Hale FoamMaster system it should be
installed in the piping before the foam
concentrate injection point.
Some applications will require installation of
a Hale mini or maxi manifold to provide a
common foam concentrate injection point
and the use of multiple flowsensors with
Hale foam discharge multiplexing display
units.
Other applications may be designed to use
a single flowsensor due to space restrictions
on the apparatus. In this instance the
flowsensor selected can be one pipe size
smaller than the piping run (4 inch to 3 inch,
Figure 2-6 shows a suggested installation
arrangement using Hale 4 inch check
valves, Hale 2433 flanges and 4 inch pipe.
A maxi manifold is available from Hale to
provide multiple discharges with a common
foam injection point using Hale 2433 bolt
pattern flanges. The discharges available
are similar to those shown for the mini
manifold.
WATERWAY CHECK VALVES
Check valves in the waterway, rated at 500
PSI (34 BAR), are required to keep foam
solution out of the main pump and allow
pump priming without drawing foam into
the piping. Using double check valves,
separated by at least 8 inches (203 mm) of
pipe before the foam injection point, helps
ensure that pump and tank water remain
uncontaminated.
FLOWSENSOR(S)
Hale FoamMaster HPF flowsensors are
specially designed to make inspection and
maintenance of the flow sensor easy. The
flowsensors are installed in the foam
capable discharge piping of the
apparatus. In horizontal piping runs, the
flowsensors should be mounted as close to
upright as possible within the range shown
Figure 2-6. Typical 4 Inch Check Valve Installation on Midship Pump
