FoamPRO 2001 - Page 14

14
Installation and Operation Manual
SystemsSystems
2001 and 2002
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.
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.
Figure 12. Recommended
Midship Pump Installation
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 are
less corrosive 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 12 for the
recommended Nipple
lengths for different
pipe sizes.
Main Waterway
Check Valve
Drain Line
Check Valve
Injection Port
Drain Port
Flowmeter
From Foam
Tank
Foam Strainer
Mounted On Foam
Pump Inlet
3/4 IN. ID
Hose
Check
Valve
Check
Valve
From
Fire
Pump
Flush Water
Shut-Off Valve
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.