42
Installation and Operation Manual
Figure 12-4
Foam Concentrate Flushing System Diagram
From
Foam Tank
Foam Strainer
Mounted On Foam
Pump Inlet
Check
Valve
Check
Valve
Flush Water
Shut-Off Valve
From
Fire
Pump
Pump
Suction
Line
Flushing Foam Pumps
When returning the apparatus to ready condition after
foam operations, the FoamPro foam pumps should be
flushed with fresh water. The following procedures can
be used to flush the foam pumps. Refer to Figure 12-4
and do the following:
1. Energize apparatus and establish water flow
through foam solution discharge.
2. Close foam concentrate tank shut-off valve and
open flush water supply valve.
3. Energize FoamPro AccuMax SP and allow hydraulic
motor-driven foam pump to run until discharge is
clear.
4. Shut off FoamPro system by depressing the FOAM
button on the Digital Display Control Module. Close
flushing water supply valve.
5. Close foam solution discharge and shut down
apparatus.
6. Open foam concentrate tank shut-off valve.
7. Perform required maintenance checks on the
FoamPro AccuMax SP.
Priming the Foam Pump When Foam Tank
Has Run Dry
In some instances, the foam tank may run dry while
operating the FoamPro AccuMax SP system. The foam
pumps are designed to pump liquid. When the fire pump
is running, the foam pumps cannot pump air efficiently
against 100 to 150 PSI (7 to 10 BAR) back pressure. To
re-establish foam concentrate flow quickly, the following
procedure can be used:
1. Turn the CAL/INJECT valve on the foam pump that
was running when the foam tank ran dry to the
CAL/INJECT position.
2. With the fire pump flowing water from the foam
discharge and the FoamPro system energized,
make sure the proper foam pump is running.
3. Observe the hose from the CAL/INJECT valve.
4. When foam concentrate flows from the hose, turn
the CAL/INJECT valve back to the INJECT position.
The pump is now primed and ready for normal
operation.
5. If the fire pump is not running, place the FoamPro
system into the simulated flow mode and proceed
with above steps.
