13
Installation and Operation Manual
System 2000
Installation and Operation Manual
System 2000
H. DRAIN LINES
On apparatus with multiple drain lines, the drains from
the foam solution discharge line should not be piped
into a multi drain system before the check valves. The
standard multi drain system from most manufacturers
will allow cross talk between the drain lines and the
apparatus water tank, resulting in contamination of the
water tank with foam. A separate drain system should
be provided for the foam solution piping to prevent
contamination of the water tank and fire pump.
I. FLUSHING SYSTEM
Depending on the corrosiveness of the foam
concentrates to be used, a flushing system may be
required in the foam concentrate injection system.
Generally, all Class B foam concentrates must be
flushed from the system after use. Most Class A foam
concentrates (per NFPA 1150) are less corrosive
Figure 12. Recommended Pump Installation
and therefore may not require flushing. Fig. 12-4 is a
recommended diagram for a flush circuit. When a dual
tank system is installed on the apparatus, provision for
flushing the foam concentrate injection system is built
into the dual tank selector system.
Minimum Length of Nipple
for 2-1/2" [158.75 mm] Pipe
is 12-1/2" [317.50 mm].
Refer to the Table on Page
11 for the recommended
Nipple lengths for different
pipe sizes.
Main Waterway
Check Valve
Drain Line
Check Valve
Injection Port
Drain Port
Flowmeter
Figure 12-4. Foam Concentrate Flushing System
Diagram
Flushing Foam Pumps
When returning the apparatus to ready condition after
foam operations, the FoamPro foam pumps should
be flushed. 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 2000 and allow electric motor
driven foam pump to run until discharge is clear.
4. Shut off FoamPro 2000 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 2000.
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