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ICAF -
Integrated Compressed Air Foam System
Foam Supply Section
FM-0723-0-13 C
Foam injection line post discharge testing procedure
(Refer to TRIM SCHEMATIC in the ICAF System section)
A test should be performed to verify that the foam injection
line is not clogged by any debris or coagulated foam
concentrate that would impair its proportioning rate.
Under normal standby conditions, foam injection line is not
pressurized. Foam injection line pressure gauge
(F4)
should
read 0 psi (0 kPa).
1. System's air supply should be open; air pressure gauge
(A4)
inside the ICAF System cabinet should indicate a
pressure of 100 psi.
2. OPEN foam injector flushing valve
(F5).
3. Wait approximately 1 minute or until pressure stabilizes
at the Foam injection line pressure gauge
(F4).
4. CLOSE foam injector flushing valve
(F5).
5. Foam injection line pressure gauge
(F4)
should vent
quickly and indicate 0 psi (0 kPa) after a few seconds.
6. If the foam injection line doesn't vent properly, the foam
injector
(C2)
shall be disassembled, cleaned, and
reassembled.
Foam injection strainer maintenance
Remove, clean and replace foam injection line strainer
(F2)
screen in original position (Note: In some instances, a high
pressure water jet or steam may be required for effective
cleaning) Inspect cover gasket for damage. Replace if
necessary.
Inspection Frequency Table
System/Component Frequency
Foam tank normal conditions
Monthly
Foam concentrate level check
Annually
Foam sample analysis
Annually
Foam injection line test
Quarterly
Foam injection strainer maintenance
Annually
