Podcast
Questions and Answers
Under what condition would manually twisting the T-handle on a Solenoid Operated Pilot Valve (SOPV) be required?
Under what condition would manually twisting the T-handle on a Solenoid Operated Pilot Valve (SOPV) be required?
- When the AFFF pump fails to maintain the required pressure output.
- In the event of a loss of electrical power to the AFFF station.
- During routine monthly testing to verify proper function of the valve.
- If either the master or service SOPV fails to automatically operate. (correct)
In the event of a fire, what is the purpose of the 'start' and 'stop' buttons associated with AFFF sprinkling systems, and where are these buttons located?
In the event of a fire, what is the purpose of the 'start' and 'stop' buttons associated with AFFF sprinkling systems, and where are these buttons located?
- They control the firemain pressure to the sprinkler heads, located in CCS and locally at the AFFF station.
- They activate and deactivate the AFFF pump locally, located at the pump housing and remotely in the damage control station.
- They initiate and terminate the AFFF flow to prevent over-flooding of the space, located at entry/exit points and within the spaces. (correct)
- They regulate the water-to-AFFF concentrate ratio, located within the proportioner and at the AFFF tank.
What is the primary function of the BPPS/Pancake Valve within the AFFF system, and how does it achieve this function?
What is the primary function of the BPPS/Pancake Valve within the AFFF system, and how does it achieve this function?
- It prevents backflow of seawater into the AFFF concentrate tank, utilizing a series of check valves and filters.
- It controls the proportioning of seawater and AFFF concentrate, adjusting the mixture based on the fire's intensity.
- It regulates the firemain pressure to ensure consistent AFFF solution output, using a pressure-reducing valve.
- It returns excess AFFF concentrate back to the tank, using a balance of firemain and AFFF pressure acting on a central plate. (correct)
What is the operational significance of the Hycheck valve remaining closed in the AFFF system's standby mode, and how does the Master SOPV influence this state?
What is the operational significance of the Hycheck valve remaining closed in the AFFF system's standby mode, and how does the Master SOPV influence this state?
How does the Powercheck valve prevent AFFF concentrate from flowing back into the firemain system, and what component directly controls its operation?
How does the Powercheck valve prevent AFFF concentrate from flowing back into the firemain system, and what component directly controls its operation?
If the forward AFFF station is supplying AFFF to Main 1 and a fire breaks out aft of frame 220, what alternative measure can be taken to supply AFFF to the affected area, assuming the aft AFFF station is inoperable?
If the forward AFFF station is supplying AFFF to Main 1 and a fire breaks out aft of frame 220, what alternative measure can be taken to supply AFFF to the affected area, assuming the aft AFFF station is inoperable?
Given a scenario where the primary power source to the AFFF system fails and the Automatic Bus Transfer (ABT) system does not switch to the secondary power source, what is the immediate consequence for the AFFF system's functionality?
Given a scenario where the primary power source to the AFFF system fails and the Automatic Bus Transfer (ABT) system does not switch to the secondary power source, what is the immediate consequence for the AFFF system's functionality?
What potential problem is mitigated by the 81M Check Valve in the AFFF system, and where is this valve located in relation to the Master SOPV?
What potential problem is mitigated by the 81M Check Valve in the AFFF system, and where is this valve located in relation to the Master SOPV?
What are the standard communication channels to establish in the event of an AFFF deployment and what alternative circuits can be used in case of primary comms failure?
What are the standard communication channels to establish in the event of an AFFF deployment and what alternative circuits can be used in case of primary comms failure?
The AFFF hose reels are equipped with a start button rather than a start/stop button. What mechanism allows the operator to halt the flow of AFFF solution from the hose reel, and where is it located?
The AFFF hose reels are equipped with a start button rather than a start/stop button. What mechanism allows the operator to halt the flow of AFFF solution from the hose reel, and where is it located?
Given that the AFFF tank alloy is 90% copper and 10% nickel, what property does this provide that is vital to the purpose of the tank?
Given that the AFFF tank alloy is 90% copper and 10% nickel, what property does this provide that is vital to the purpose of the tank?
What is the flow rate and pressure output of the single-stage AFFF pump, and how does this affect the fire suppression capabilities of the system?
What is the flow rate and pressure output of the single-stage AFFF pump, and how does this affect the fire suppression capabilities of the system?
What specific areas or spaces are covered by the AFT AFFF station according to the provided information?
What specific areas or spaces are covered by the AFT AFFF station according to the provided information?
How does the Proportioner achieve proper mixing of seawater and AFFF concentrate to achieve a 94/6 ratio?
How does the Proportioner achieve proper mixing of seawater and AFFF concentrate to achieve a 94/6 ratio?
What does a Red & Blue color designation signify within the AFFF system's color-coding convention?
What does a Red & Blue color designation signify within the AFFF system's color-coding convention?
Flashcards
AFFF (Aqueous Film Forming Foam)
AFFF (Aqueous Film Forming Foam)
A firefighting foam used to suppress flammable liquid fires.
Manning AFFF Station
Manning AFFF Station
Communicate using net X50J, Verify power, Tank at 95%+, Verify alignment using EOSS procedures for AFFF-V.
AFFF Lifespan
AFFF Lifespan
AFFF has an infinite lifespan and can be frozen and thawed without losing usability.
AFFF Cross Connects
AFFF Cross Connects
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ABT (Automatic Bus Transfer System)
ABT (Automatic Bus Transfer System)
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Master SOPV
Master SOPV
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Service SOPV
Service SOPV
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BPPS/ Pancake Valve
BPPS/ Pancake Valve
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Proportioner
Proportioner
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FWD AFFF Station
FWD AFFF Station
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AFT AFFF Station
AFT AFFF Station
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AFFF Sprinkling Push Buttons
AFFF Sprinkling Push Buttons
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AFFF Hose Reel
AFFF Hose Reel
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Study Notes
AFFF (Aqueous Film Forming Foam) Station Procedures
- Establish communication using net X50J or the designated circuit.
- Confirm power availability via the white luminescent light.
- Ensure the AFFF tank is at 95% capacity or higher.
- Verify proper system alignment using EOSS procedures for AFFF-V.
Manual Refilling of AFFF Station
- Open a 5-gallon drum of AFFF concentrate.
- Pour the AFFF concentrate into the tank.
- AFFF's lifespan is effectively infinite; it remains usable even after freezing and thawing.
- There is a reserve of 60, 5-gallon drums (600 gallons total) stored forward and aft.
- Refilling requires two people: one to fill and one as a safety observer.
Cross Connects
- There are two cross connects for AFFF: one outside of medical and one outside the mess decks.
- Cross connects allow AFFF distribution from one station if another is inoperable.
- Open the cross connect and the selective powertrol to redirect AFFF flow.
Loss of Electrical Power
- ABTs (Automatic Bus Transfer System) automatically switch from primary to secondary power in case of power loss.
- ABTs are located outside SIFR (forward) and outside the barbershop (aft).
- The AFFF system requires 440V to operate.
Loss of Firemain
- Verify firemain alignment.
- Check firemain pressure at the AFFF station and CCS (Central Control Station).
Loss of AFFF Concentrate
- Check the AFFF tank level.
- Verify system alignment.
- Inspect the pump control valve.
- Inspect the master Solenoid Operated Pilot Valve (SPOV).
Failed SOPV (Solenoid Operated Pilot Valve)
- Manually operate the master or service SOPV by twisting the T-handle if automatic operation fails.
Loss of Communications
- Use circuit X2JZ (Auxiliary Damage and Stability Control Circuit), which connects to all lockers.
- Use Net 80/2JZ for communication.
AFFF System Components
- Master SOPV controls the Hycheck, Powercheck, and the pump.
- Service SOPV controls the powertrols.
- Single Stage Pump operates at 65 GPM at 175 PSI.
Hycheck Valve
- Controls the firemain supply.
- In standby mode, firemain pressure from the master SOPV keeps the Hycheck closed.
- When the master SOPV releases pressure, firemain forces the Hycheck open.
- If AFFF/seawater pressure exceeds firemain pressure, the valve closes to prevent backflow.
Powercheck Valve
- Controls the flow of AFFF concentrate.
- A powertrol valve with a lift check feature.
- The upper valve spring normally keeps the valve closed when no pressure is applied.
- Firemain pressure on the control line opens the valve.
Powertrol Valve
- Controls the AFFF solution.
- Normally closed by spring pressure.
- Opens when the service SOPV pressurizes the control line with firemain pressure.
AFFF Tank
- Capacity: 600 gallons.
- Composed of 90% copper and 10% nickel for corrosion resistance.
81M Check Valve
- Prevents water from flowing into the master SOPV and potentially activating it.
BPPS/Pancake Valve (Pressure Proportioning System)
- Returns excess AFFF concentrate to the tank.
- Uses firemain pressure on top and AFFF pressure on the bottom, separated by a plate.
- Excess AFFF pushes the plate down, allowing concentrate to return to the tank.
Proportioner
- Mixes seawater and AFFF concentrate.
- Achieves a 94/6 ratio (94% seawater, 6% AFFF concentrate).
- Creates a venture effect to draw in AFFF concentrate.
Forward (FWD) AFFF Station
- Controls the forward vertical replenishment station, Main 1, and Auxiliary 1.
- Covers areas forward of frame 220.
Aft AFFF Station
- Controls the Flight Deck, Main 2, 3 Gen, RAST, hanger bay (port and starboard).
- Covers areas at and aft of frame 220.
AFFF Sprinkling System
- Uses push buttons (start and stop) to control sprinkling and prevent overflow.
- Located at entries/exits and inside protected spaces.
AFFF Hose Reel
- Has only a start button.
- Features a cutout valve to stop AFFF flow, or use the bail.
- Located at entrances/exits of engineering spaces for each deck and outside the space.
- Main 2 has an extra AFFF hose reel on the upper level.
- The hose is non-collapsible to enable single-person operation.
Color Coding
- AFFF: Red and Green
- AFFF Concentrate: Red and Blue
- Firemain: Red
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