12
Installation and Operation Manual
SystemsSystems
2001 and 2002
The hose from the CAL/FLUSH port may have a
lower pressure rating since it is plumbed to the
atmosphere and will not receive high pressures.
This hose is used for calibrating the foam pump,
pumping the concentrate into a container to
empty the tank or to assist in priming of the
foam pump. The hose from the CAL/FLUSH
port must be long enough to reach a container
outside the truck. This hose must be coiled for
storage when not in use.
D. LINE STRAINER
The line strainer that is provided with the
FoamPro unit has
3
/4 inch NPT female threaded
ports and is to be installed on the inlet port side
of the foam pump. The hose from the foam tank
should have adequate wall stiffness to withstand
the vacuum of the foam pump while it is
operating (23 in. [584 mm] Hg and 50 psi
[3 BAR]).
NOTE: If a pressurized water flush from one of
the discharges is incorporated, the plumbing and
line strainer exposed to this pressure must be
rated at or above the operating pressure of all
other discharge plumbing components. (400 psi
[28 BAR] minimum) (600 psi [41 BAR] for
2002HP models).
E. FLOWMETER(S)
The FoamPro System 2001 and 2002 are
designed to accept flow reading signals from the
FoamPro paddlewheel style flowmeter.
Proper flowmeter sizing is critical to system
accuracy. Select a flowmeter size based on
actual flows required, not standard pipe sizes.
Refer to the installation drawing at the end of
this manual (Page 39) for proper flowmeter sizing.
The flowmeters require that the amount of
turbulence in the pipe being monitored is as low
as possible. Excessive turbulence produces
unstable and inaccurate flow readings. The
following installation guidelines will help attain
the best readings and maintain accuracy of the
FoamPro system.
Figure 7. Flowmeter Placement
a. A minimum 5 times the pipe diameter of
straight run pipe without any fittings is
necessary upstream of the flowmeter.
10 times is better — the longer the straight
run, the lower the turbulence. Here are
some examples of required straight run:
Pipe Recommended
Size Straight Run Pipe
1-
1
/2 in. [38 mm].... 7-
1
/2 to 15 in. [191 to 381 mm]
2 in. [50 mm] ........ 10 to 20 in. [254 to 508 mm]
2-
1
/2 in. [64 mm].... 12-
1
/2 to 25 in. [317 to 635 mm]
3 in. [76 mm] ........ 15 to 30 in. [381 to 762 mm]
4 in. [100 mm] ...... 20 to 40 in. [511 to 1016 mm]
b. The downstream plumbing of the flowmeter
is not as critical; but again, straight runs
without fittings help maintain accurate flow
readings.
c. Do not mount a flowmeter directly after
an elbow or valve. Valves create severe
turbulence when they are “gated-down”.
d. Try to mount the flowmeters in a position
that is accessible for routine inspection and
maintenance.
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