Page 6 of 10
ICAF
- Integrated Compressed Air Foam System
General Section
FM-0723-0-07 C
Pressure is released from the priming chamber to the
open drain manifold faster than it is supplied through the
restricted orifice
(B3)
. The Flow Control Valve
(B14)
clapper opens to allow water to flow into the system
piping and alarm devices, causing the water flow alarm
connected to the Alarm Pressure Switch
(B15)
to activate.
The
foam pneumatically actuated control valve
(F1)
opens, pressurizing the foam concentrate tank with air
and expelling the foam concentrate in the foam injection
line through the dip tube. Water, air and foam
concentrate being supplied at the mixing chamber,
Compressed Air Foam (CAF) is then generated and
moves inside the piping network toward the distribution
nozzles.
When the discharge time has elapsed:
Electric Fail Safe Release: The Control Panel de-
energizes the normally closed Solenoid valve
(R2)
,
allowing it to close, the normally closed solenoid
(R4)
is
energized allowing the pressure control line to vent and
close the
pneumatically actuated control valves for
water
(B9)
, air
(A1)
and foam
(F1)
. The Flow Control
Valve
(B14)
re-primes and closes, stopping the flow of
water through the piping system.
Electric Release System: The Control Panel de-energizes
the normally closed three way Solenoid valve
(R2)
,
allowing it to close. The pressure control line is then
vented allowing the
pneumatically actuated control valve
s
for water
(B9)
, air
(A1)
and foam
(F1)
to close. The Flow
Control Valve
(B14)
re-primes and closes, stopping the
flow of water through the piping system
Emergency Shut-off instructions
(Refer to TRIM SCHEMATIC section)
1. Press and hold the F3 function key labelled:
"System
Shut-Off"
on the keypad of the ARC-1 panel until its
adjacent red lamp is turned ON.
2. Close the system main water supply control valve
(B10)
inside the ICAF cabinet. The red lamp labelled
"Discharge suspended"
will turn ON.
Note:
This special function is not intended to be used prior
to the CAF discharge.
Post Discharge Instructions
(Refer to TRIM SCHEMATIC section)
To take the system Out of Service:
Warning !
Placing the control valves or detection system
out of service may eliminate the fire protection capabilities
of the system. Prior to proceeding, notify all Authorities
Having Jurisdiction. Consideration should be given to
employ a fire patrol in the affected areas.
ICAF Systems that have been exposed to a fire must be
returned to service as soon as possible. The entire system
must be inspected for damage, and repaired or replaced as
necessary.
1. Close Water Supply Control Valve
(B10)
.
2. Open system Main Drain Valve(s)
(B16)
.
3. Open the System Flushing Valve
(A3)
to flush the piping
network.
4. Open the Foam Injectors Flushing Valve
(F5)
to flush the
foam injectors.
5. Silence alarms (if provided; refer to CONTROL PANEL
section for additional details).
Note:
Electric alarms controlled by a pressure switch
installed in the ½" (15mm) NPT connection for a Non-
interruptible Alarm Pressure Switch cannot be shut-off
until the Flow Control Valve
(B14)
is reset or taken out of
service.
6. For Pneumatic Release Systems, shut-off the air supply
(refer to TRIM SCHEMATIC section).
7. Close Priming Valve
(B1)
(optional).
8. Close Air Supply (Refer to AIR SUPPLY for details).
9. Replace any detectors, pilot heads or other release
device that have operated.
10. Replace any nozzle that have been damaged or
exposed to fire conditions. Obstructed nozzles may be
cleaned and re-installed.
11. Perform all maintenance procedures recommended in
MAINTENANCE, describing individual components of
the system that has operated.
Placing the system back in service after
operation
(Refer to TRIM SCHEMATIC section)
IMPORTANT
:
After a fire, make sure it is completely
extinguished. If necessary, place a fire patrol in the zone
covered by the system. ICAF Systems that have been
subjected to fire must be returned to service as soon as
possible. The entire system must be inspected for
damage, and repaired or replaced as necessary.
1. Verify that the system has been properly drained. Main
Water Supply Control Valve
(B10)
and priming valve
(B1)
must be CLOSED. Flow Test Valve
(B6)
and main
drain valves
(B16)
should be OPEN.
2. Open the System Flushing Valve(s)
(A3)
to flush the
piping network.
3. Open the Foam Injectors Flushing Valve
(F5)
to flush the
foam injectors.
4. Air supply must be CLOSED (see AIR SUPPLY
SECTION). Verify that the Emergency Release
valve
(R1)
is CLOSED. System flushing valve
(A3)
and
foam injector flushing valve
(F5)
must both be CLOSED.
All gauges
(B11, B12, B17 and F4)
should show 0 psi
pressure.
5. Refill the foam concentrate tank
(T1)
according to the
procedure described in the FOAM SUPPLY section.
Содержание ARC-1
Страница 1: ...Operation Maintenance Manual FM 0723 0 02 A...
Страница 7: ...OWNER S OPERATION MAINTENANCE MANUAL ICAF Integrated Compressed Air Foam System FM 0723 0 04 A...
Страница 29: ...Page 4 of 4 ICAF Integrated Compressed Air Foam System System Trim Section FM 0723 0 09 A...
Страница 44: ...Page 1 of 2 ICAF Integrated Compressed Air Foam System Notes Warranty FM 0723 0 16 B User Notes...
