Hale FoamLogix 6.5 - Manual (Page 62)

❑ Installer Installation
62 FoamLogix 3.3 / 5.0 / 6.5 Installer / Operations Manual
p/n: 029-0021-68-0
“Waterway” Check Valves
Check valves in the waterway, rated at 500 PSI (34.5 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 6” to 8” (152 to 203mm) of
pipe before the foam injection point ensures that the pump and tank water
remain uncontaminated.
Flow Sensor
The Hale FoamLogix flow sensor is specially designed to enable quick and
easy sensor inspection and maintenance. The flow sensor paddle wheel is
installed on a saddle clamp or weld fitting to the foam-capable discharge
piping of the apparatus.
In horizontal
piping runs, the
flow sensor is
mounted within
the range
shown in Fig-
ure 3-9: “Flow
Sensor Tee
Position Range.”
The flow sen-
sor is installed
in the piping
before the foam
concentrate
injection point.
When selecting a flow sensor, it is important to consider the minimum and
maximum flow requirements during operation. Also see Table 3-10: “Pipe
Size vs. Minimum Straight Run” on page 63.
Some applications may require flow sensor accuracy that is not within the
range specified for the discharge piping. This is true in applications where
the foam system needs to supply a 3” (76mm) deck gun, as well as a 1”
(25.4mm) booster line.
Pipe size for flow sensor mounting must be selected to provide accuracy at
the lowest flow rate. Mounting the flow sensor in a short section of pipe,
one pipe size smaller (e.g., 4” to 3”; 3” to 2-1/2”, etc.), provides better accu-
racy at the lower flows.
Figure 3-9: Flow Sensor Tee Position Range