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What is AFFF comprised of?
Synthetically produced materials similar to liquid detergents
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What color is AFFF?
Slight amber color liquid
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What is the mixture for AFFF?
- 94% water or firemain
- 6% AFFF concentrate
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What type of fire would you use AFFF primarily?
Class Bravo
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Is AFFF better to use than water on Class Bravo fire?
Yes due to it's penetrating characteristics
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What are the three things AFFF does to a fire?
- 1. Forms a film on the surface of fuel which prevents escapes of vapors
- 2. The layer of foam excludes oxygen from the fuel source
- 3. The water content of the foam provides a cooling effect
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Name a few places where AFFF stations are installed
- Machinery spaces
- Fueled vehicle stowage spaces
- Helicopter hangars
- Landing platforms
- Flight Decks
- Hangar bays
- Refueling station
- Fuel pump rooms
- Other compts. w/ flammables/combustibles
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How many AFFF stations are located onboard?
20, 10port 10stbd
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How many gallons do the AFFF stations hold?
600 gallons
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How is AFFF transfered to the AFFF stations?
By using 2 reserve tanks located in the overhead of hangar bay 1 port side and hangar bay 3 stbd side
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How many gallons can the 2 AFFF reserve stations hold?
3,500 gallons
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How much GPM are the reserve AFFF stations rated at?
360 GPM
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How do the reserve AFFF stations fill the primary stations?
Through use of gravity or transfer pumps
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How many AFFF transfer pumps do we have?
- 2
- 1 near fwd mess decks near station 6
- 1 near DC office, near station 13
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What are the hand wheel colors for AFFF concentrate?
Striped Red and Blue
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What are the hand wheel colors for AFFF Mixtures?
Striped Red and Green
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What is the Sound Powered Phone circuit for AFFF stations?
X50J
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What are the three ways to light off an AFFF station?
- SOPV
- Push button
- motor controller
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If unsure what valves to open and how to operate the AFFF station, what is provided at the station?
EOSS information
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What does EOSS stand for?
Engineering operating sequencing system
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What does SOPV stand for?
Solinoid operated pilot valve
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How does the SOPV work?
It is a 440v pilot valve that electrically activated system
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What are the two ways to electrically activate the SOPV?
- Pushbutton
- manually rotate a T handle
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How do you secure the master SOPV?
Locally at the AFFF station
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How many control line ports are there on an SOPV?
4
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What are the 4 control line ports for SOPV?
- 1. always connected to FM supply pressure
- 2. Always connected to a drain pipe
- 3 and 4. Are connected by control lines to diaphragm operated control valves or one will be plugged if not
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How are Hycheck/Powertrol/powercheck vavles connected to the SOPV?
By the FM pressure control line
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What happens when the master SOPV is energized?
The control line to the powertrol/powercheck is pressurized, which in turn opens the valve
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How is the powertrol valve normall held closed?
by spring pressure
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What is attached to the bottom of a powertrol valve to prevent flow from sprinklers when testing AFFF?
A test cap fitting
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Is the powercheck valve normally open or closed?
normally closed
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What is the powercheck valve?
Seawater pressure operated control valve
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What does the powercheck valve do?
Allows only 4% off AFFF from the pump to be mixed with seawater in the venturi and prevents seawater contamination
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How does the powercheck valve prevent contamination?
Valve disc holder and stem will slide to the closed position if back pressure downstream exceeds upstream side
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What do you use if there is no electrical power to light off the AFFF system?
Utilize the T handle located insode the SOPV box
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What provides emergency power to the AFFF station?
ABT
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What is the Hycheck valve?
Seawater pressure operated control valve that allows the flow of seawater from the firemain system to be mixed with AFFF concentrate
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What is the Hytrol valve?
Seawater pressure operated control valve which controls the flow of AFFF solution to systems
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What are check valves used for?
Installed to prevent return or back flow in pipes (one way only)
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Do check valves have handwheels or stems?
No, they are automatically operated valves without handwheels or stems
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What is the purpose of the backpressure regulating valve?
Balances the pressure for mixing ratio of FM to AFFF to achieve 94-6 and will open to divert flow overboard
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What is the purpose of the injection pump?
To send the AFFF supply to the flight deck
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What is the injection pump GPM?
60 GPM
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How many injection only stations are there?
4
Book says that 16 stations provide to the flight deck
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What stations are the injection only stations?
1, 2, 11, and 12
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What are the proportioning pumps designed for?
Balancing (equalizing) the AFFF liquid pressure and firemain pressure at the entrance to the proportioner mixing chamber
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What GPM are the proportioning pumps rated at?
65 GPM
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What valve automatically proportions the correct amount of AFFF conentrate with seawater?
The balancing valve
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What type of hoses are used on the AFFF stations?
Black non-collapsible rubeer hose
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What are the 4 types of spinkler heads?
- flush deck
- bilge
- deck edge
- overhead
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What are the flush deck spinklers designed for?
To completely cover the flight deck areas for both CMWD and fire extinguishment
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Where are the panels for the flush deck sprinkler systems located at?
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How much GPM is provided for the flush deck sprinkler system?
1,000 GPM
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What does the bilge sprinkler system do?
delivers a blanket of foam over the protected area to vapor-secure pooled furl
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What does the deck edge sprinkling system do?
Provided for helo decks, bomb farms, and elevators in order to assist flush deck nozzles
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Where are the overhead sprinlers provided at?
- Hangars
- Well ddecks
- Fantails
- Pump rooms
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Can H2S natuarally occur in AFFF?
Yes, in already mixed stagnant solutions
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Whare are your two options to use AFFF in a space that isn't covered by an AFFF station?
- AFFF extinguisher
- In line eductor
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How many gallons does the AFFF extinguisher hold?
2 1/2 gallons or a premixed solution of AFFF concentrate and fresh water
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How many lbs does the AFFF extinguisher weight when fully charged?
28 pounds
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How many gallons of AFFF expanded is producted after using the extinguisher?
16 gallons (ratio 6.5 to 1)
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What is the continuos discharge time for the AFFF extinguisher?
45-60 seconds
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What is the initial range of the AFFF extinguisher?
15 feet deminishing over time
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