Liquid Fuels Systems Maintenance Journeyman
Volume 5: Operation and Maintenance of Hydrant System Components
CDC 3E452
Red
Amber
Orange
Yellow
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To operate the CDHS-2
To operate the CDHS-3
To operate the CDHS-4
To operate the CDHS-5
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Loose diaphragm washer
Obstruction in main valve
Clogged cover-chamber tubing
Air in main valve cover chamber
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A tin grounding rod
A cast steel grounding rod
A black iron grounding rod
A galvanized grounding rod
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Barges or pipelines
Railroad
Air Force truck
Commercial trucks
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10 seconds
20 seconds
30 seconds
40 seconds
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Electrical shorts
No delivery of fuel
Minor leaks
Jammed valves
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Allow for expansion
Absorb hydraulic shock
Keep the entire line from draining
Provide a place for priming the pump
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Hytrol A closing
CDHS-3 tripping
Solenoid not energized
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20 feet, 18 inches
20 feet, 24 inches
50 feet, 18 inches
50 feet, 24 inches
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Open; low-voltage for the fuel transfer pump control
Closed; low-voltage for the fuel transfer pump control
Open; high-voltage for the fuel transfer pump control
Closed; high-voltage for the fuel transfer pump control
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Copper
Carbon steel
Galvanized steel
Seamless stainless steel
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When the operator acknowledges the alarm
When the high-high-level alarm is activated
When fuel is removed to a level below the low-level alarm setting
When fuel is removed to a level below the high-level alarm setting
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Zero
Infinity
A fixed reading between zero and infinity
A fluctuating reading between zero and infinity
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When the system is not used in 30 days
Before serving an aircraft
After defueling an aircraft
Every day
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Uncontrolled downstream flow
Fuel leakage from the vent port
Uncontrolled downstream pressure
Fuel leaking from the disc removal plug
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To increase system pressure
So the main diaphragm will operate properly
To provide a smoother low through the valve
For system safety in case the main valve diaphragm ruptures
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CRD
CDHS-3
Loading CRL
CV flow control
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On top of the tank in the float well
On top of the tank in the gauging well
On the exterior side of the tank at the required shutoff height
On the interior side of the tank at the required shutoff height
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Copper
Galvanized
Stainless steel
Not required
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10
25
50
100
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Pump
Valves
As-built drawing
Fuel storage tank
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VPI
Hytrol
Ejector
Ejector-strainer
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Place the magnet on the refuel KISS switch
Place the cover back on the emergency switch
Manually reset the controls in the lateral control pit
Manually reset the controls in the pump-house control room
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0.2 inch
0.02 inch
0.002 inch
0.0002 inch
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The CRA
The CV flow control
The hydraulic deadman
The pneumatic deadman
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Explosion-proof, enclosed type
General-purpose, enclosed type
Explosion-proof, non-enclosed type
General-purpose, non-enclosed type
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Fuses
Relays
Fuel level
Control panel setup
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Replace the poppet
Replace the stem guide
Replace the flange gasket
Replace the disc and seat
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Leakage through normally open solenoid valve
Leakage through normally closed solenoid valve
Leakage through solenoid valve during slow flow
Check valve installed backwards
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Tighten jam nut
Tighten adjusting screw
Place cap back on the control and seal
Turn off all solenoid switches in the pit.
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Class 1, Division 1, Group C
Class 1, Division 1, Group D
Class 1, Division 2, Group C
Class 1, Division 2, Group D
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Keep moisture out of the system
Prevent corrosion in the piping system
Keep the fuel pressure from getting too high
Prevent air from entering the installed piping system
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Vacuum control switch
Pump circuit breaker
Pump control switch
Air control switch
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When any pump is on in the manual mode
When any pump is on in the refueling mode
When any pump is off
When all pumps are off
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1
2
3
4
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10,000 bbl
20,000 bbl
30,000 bbl
40,000 bbl
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Both must be open
Both must be closed
One must be fully open and one must be fully closed
One must be partially open and one must be partially closed
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2,000 gallons
3,000 gallons
4,000 gallons
5,000 gallons
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NFPA 70
MAJCOM fuels engineer
American Petroleum Institute
National Society of Engineers
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Stainless steel, lubricated, welded
Stainless steel, lubricated, flanged
Stainless steel, non-lubricated, welded
Stainless steel, non-lubricated, flanged
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2; pump control and pump selector
2; pump selector and transformer selector
3; pump control, pump selector, and defuel pumps
3; pump control, transformer selector, and pump selector
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Two-port, normally open
Two-port, normally closed
Three-port, normally open
Three-port, normally closed
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600gpm positive displacement
1,200gpm positive displacement
600gpm non-positive displacement
1,200gpm non-positive displacement
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Select the lead pump, place the system in manual, and push SYSTEM STOP
Select the lead pump, place the system in manual, and push SYSTEM START
Select the lead pump, place the system in automatic, and push SYSTEM STOP
Select the lead pump, place the system in automatic, and push SYSTEM START
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1, closes
1, free floats
2, closes
2, free floats
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To the product recovery tank
To the other aircraft being refueled
Into an R-11 refuel/defuel truck
Into the return line of the HSV checkout stand
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Upstream pressure and flow rate
Orifice-plate size and downstream pressure
Upstream pressure and downstream pressure
Gallons-per-minute delivery and orifice-plate bore size
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