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Installation and Operation ManualInstallation and Operation Manual
FOAMPRO PADDLEWHEEL
FLOWMETERS
The FoamPro paddlewheel-style flowmeter fittings
are specially designed tees and manifolds that make
inspection and maintenance of the flow sensor easy.
The threads of the tees are NPT. In horizontal runs, the
tees should be mounted as close to upright as possible
within the range shown in Figure 8.
With the use of a MultiFlo interface, two to four
flowmeters may be monitored simultaneously. A single
injection point that will supply foam agent to all foam
discharge outlets is required.
F. INJECTOR FITTING (optional)
The brass injector fitting ensures foam concentrate
is injected into the center of the water flow for
better mixing. It is designed to fit into a 1 inch NPT
threaded connection on a pipe tee that is installed
in the discharge piping of the fire pump (See Figure
9). The inlet of the
fitting is 1/2 inch NPT
female thread and the
outer threads are 1 inch
NPT. The injector may
also be inserted into a
weld fitting with 1 inch
NPT female threads. It
MUST be mounted in a
place that is common
to all discharges which
require foam capability.
This fitting is not used
if using a FoamPro Main Waterway Check Valve. A
separate injection point is not possible for each
discharge. If multiple flowmeters are used, the injector
must be installed before the flowmeters at the inlet to
their common manifold (See Figure 10).
Most foam concentrates by nature mix with water
very quickly, so each discharge from a manifold will
receive equal concentrations if the manifold is properly
designed and installed.
G. CHECK VALVES
A 1/2 inch NPT check valve meets NFPA requirements
for a non-return device in the foam injection system.
To prevent foam concentrate flow from the foam
concentrate tank due to static head pressure, the foam
concentrate check valve shall have a 12 psi [0.6 BAR]
cracking pressure and shall be capable of withstanding
the pressures that will be generated in the foam
injection line. It is always a good idea to inject foam at
a horizontal or higher angle to allow water to drain away
from the check valve (See Figure 11). This will avoid
sediment deposits or the formation of an ice plug.
The check valve in the water way is required to keep
foam solution out of the main pump and allow pump
priming without drawing foam into the piping. See
Figure 12.
Figure 8. Flowmeter Position Range
Tee Shown without
Sensor Installed
85°
Max
.
85°
Max.
Figure 9. Injector Fitting
Installation
Figure 10. Injector Fitting Placement for
Multiple Discharges
Injector
Fitting
(optional)
(optional)
Injector Above
Horizontal Plane
DON'T
Injector Below
Horizontal Plane
Injector Above
Horizontal Plane
DO
Injector Below
Horizontal Plane
Figure 11. Foam Injector Position
DON’T
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