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LOX Flashcards

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0
Q

LOX characteristics

A
  1. boils at -297F(183C)
  2. 1 cubic ft of lox expands to 860 cubic ft of gas at 70F(21C) sea level(860 times)
  3. 1.14 times heavier than water and weighs 9.527 lbs per gallon
  4. 25 liters of lox converts to 18,974 liters of gaseous O2
  5. pale blue liquid, exists in liquid state from temps -182.5 C- 297F

M13520.1C 5-5

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1
Q

LOX rules

A
  1. clean copper, aluminum, or SST drip pans must be placed under outlet overflow vents of servicing units
  2. do not completely leave valves open, initially completely open valves then close them 1/4 turn to prevent valves from freezing in open posit.
  3. PPE- face shield, gloves, coveralls, apron, shoes.
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2
Q

LOX cart

A
  1. servicing cart 1200lbs, designed to store 50 gL of lox.
  2. space b/w the inner and outer shell on the cart is called the annular space
  3. 300 psi lox in system
  4. operates 270-455psi in static system/ 270-340psi under continuous breathing
  5. 6 supply regulators in flight station, 4 in cargo compartment
  6. service cart wheels to 12-15 psi
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3
Q

LOX USES

A
  1. @ 30,000ft and above 100% O2 will be delivered
  2. LOX qty(A) light comes on when supply drops below 5.0 L
  3. LOX qty LOW (C) light comes on when supply drops below 2.5 L
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4
Q

_____ shall be used specifically as a thread sealant

A

teflon tape

molybdenum disulfide shall be used on stainless steel flared fittings and on those applications where teflon tape cannot be used

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5
Q

When warmed to ambient temperature LOX expands to a gas ___ times its liquid volume

A

860:1

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6
Q
  1. What Is used to lubricate the parking brake on the LOX cart
  2. What do you lubricate the handbrake release handle and linkage with?
A
  1. mil-m-7866 graphite
  2. Lubricating oil mil-prf-6086 grade M

MPC 350020.0 p.19

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7
Q

In what manner shall the vent valve be when the cart is parked or being transported?

A

LOX carts shall be parked with the vent valve open and transported with the vent valve closed

TO 00-25-172 p. 4-14

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8
Q

What PPE is required for servicing LOX

A

Face shield, gloves(thermal insulated or leather welding), coveralls(cotton), apron(impermeable cotton duck, coated with rubber, boots

M13520.1C 5-6

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9
Q

LOX trailer inspect interval

A

Inspect, clean, grounding reel- 30 days reference AFTO 37C2-8-3-13, NAVAIR 19-25D-33, AFTO 37A19-3-2, AFTO 37C2-8-3-11
inspect, clean, lubricate- 90 day
inspect, clean, lubricate- 180 day

CGTO PG-85-00-310-A 5-3

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10
Q

How close should fire protection be when servicing

A

50 ft

MPC 350020.0 P. 5

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11
Q

What is the LOX safety zone

A

20 ft radius

MPC 350020.0 P. 5

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12
Q

If LOX spills on asphalt or concrete expansion joint sealant, stop servicing or other operations within a __ __ __ of area…..do not walk or roll equipment over the area of spill for at least __ __

A

20 ft radius
30 minutes

MPC 350020.0 P. 6

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13
Q

What do you wash the service cart filler valve and airplane fill build up valve with

A

Octagon OCC(NOC)

MPC 350020.0 P. 6

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14
Q

What are the parking rules for the cart

A
  1. 25 ft from any structures having fire resistant or non-combust
    ible exterior walls with automatic fire extinguishing systems
  2. 50 ft from combustible structures sources of ignition, heavy
    traffic areas or smoking areas
  3. 75 ft from airplane parking, fueling, or defueling areas
  4. parked with vent valve open and transported with it closed
  5. parked with the rear end is higher than the front end or the control
    panel is higher than the towing end

MPC 350020.0 P. 6

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15
Q

What are the tires inflated to

A

12-15 psi

MPC 350020.0 P. 10

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16
Q

What do you lubricate the cover hinge and latch of the servicing tank with

A

MIL-PRF-6086

MPC 350020.0 P. 17

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17
Q

What do you lubricate the handbrake release handle and linkage with

A

MIL-PRF-6086

MPC 350020.0 P. 19

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18
Q

No reading above __ __ should be read for electrical resistance for the static points

A

10 ohms

MPC 350020.0 P. 18

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19
Q

What do you lubricate the grease fitting at the bottom of the handbrake lever mechanism and caster wheel swivel joint, pivot sleeve, and locking pin with

A

Automotive Grease MIL-PRF-10924

MPC 350020.0 P. 23

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20
Q

What do you coat the 2 screws that secure the static grounding cable to the grounding clip with

A

Silicone sealant MIL-A-46146

MPC 350020.0 P. 24

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21
Q

How many turns for the 50ft and 75ft grounding reel

A

50ft- 36 full turns
75ft- 47 full turns

AFTO 37A19-3-2 5-3

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22
Q

How close should the fire protection equipment be to the LOX servicing operation

A

50 ft

MPC 121401.0 p.2
HC 130J

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23
Q

What should be turned off when servicing LOX

A

Electrical systems not required for servicing

MPC 121401.0 p.2
HC 130J

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24
How large is the radius of the safety zone during oxygen servicing
20ft MPC 121401.0 p. 2 HC 130J
25
What maintenance and other servicing operations do you not service oxygen concurrently with
Fuel, oil, water-alcohol, hydraulic fluid, environmental fluid, or any systems containing such hydrocarbon based products MPC 121401.0 p.2 HC 130J
26
What do you do when LOX has come in contact with skin
Transport immediately to nearest medical facility. Do not attempt to rewarm affected body parts MPC 121401.0 p.3 HC 130J
27
Do not allow LOX to come in contact petroleum products, asphalt, or concrete expansion joint sealant for what reason
Fire or explosion may result. If it occurs stop all operations with 20ft radius of spill and do not walk or roll equipment over the are for at least 30 minutes, waiting until all fog or frost has disappeared. MPC 121401.0 p.3 HC 130J
28
What do you wash the service cart filler valve(hose adapter) and the airplane fill-buildup-vent valve with
Octagon OCC (NOC) MPC 121401.0 p.3 HC 130J
29
When parking or storing carts with containers of LOX or gaseous oxygen carts shall be parked as follows
1. At least 25 ft from any structure having fire resistant or non-combustible exterior walls or with automatic fire extinguishing systems 2. At 50 ft from any combustible structure or sources of ignition including heavy traffic areas where equipment is in operation or smoking areas 3. At 75ft from airplane parking fueling or defueling areas 4. LOX carts shall be parked with the vent valve open and transported with the vent valve closed MPC 121401.0 p.3 HC 130J
30
How should the cart be positioned when servicing a plane
As far away from plane as allowed by length of hose. Ensure the front of the cart, tow hitch, is facing aft of the aircraft with control panel positioned perpendicular to servicing port MPC 121401.0 p.4 HC 130J
31
What is the first step after positioning the LOX cart
Set service cart parking brake(automotive type parking brake) MPC 121401.0 p.4 HC 130J
32
What do you do before positioning oxygen cart(LOX)
Conduct ramp inspection within a 20ft radius of servicing are, ensuring area is free of petroleum products MPC 121401.0 p.4 HC 130J
33
What is 2nd step after positioning LOX cart to plane
Connect ground wire from service cart to same static ground that the airplane is grounded to MPC 121401.0 p.4 HC 130J
34
What do you clean aircraft filler valve with
Oxygen cleaning compound Octagon OCC (NOC), using a lint free cloth MPC 121401.0 p.5 HC 130J
35
When purging service hose what pressure do you build to and maintain
40 psi (+-5) MPC 121401.0 p. 5 HC 130J
36
How many and what valves to you open and close when purging the service hose
4 Build up valve, vent valve, service valve, service drain valve MPC 121401.0 p.5 HC 130J
37
What valve is used to maintain the 40(+-5)psi needed for purging and serving oxygen system
Buildup valve(and/or vent valve for purging) MPC 121401.0 p.5 HC 130J
38
What manual can you find LOX system servicing information
CGTO 1C-130J-2-35JG-00-1 MPC 121401.0 p.2 HC 130J
39
What is the number for the LOX servicing cart
TMU-27/M MPC 121401.0 p.2 HC 130J
40
What fire extinguisher is used when servicing LOX
HALON 1211 (150 pounds) MPC 121401.0 p.2 HC 130J
41
What directive gives proper protective equipment/clothing approved for lox and the material and tools being used
TO 00-25-172 TO 15X-1-1 P. 18 XVI
42
What is the standard workbench size
34in high by 30in wide by 72in long 2-1/2 X 2-1/2 feet cubicles of work area for each mechanic TO 15X-1-1 P. 31(2-3)
43
What is the minimum size of the oxygen equipment fitting area
50 sq ft it allows for the fitting of 2 people TO 15x-1-1 p. 33(2-5)
44
No open flames or smoking for aminimum distance of ____ ft. from oxygen source
50 ft TO 15X-1-1 p. 5-2
45
If the pressure falls below this value, moisture is very likely to accumulate in the cylinders.
5 pounds per square in(PSI) TO 15X-1-1 p 5-2
46
What type of boots should be worn for LOX
leather boots with close fitting tops of approximately 8 inches in height and preferably neoprene soles and heels are recommended. TO 15X-1-1 P 5-3
47
The pressure relief assembly in a LOX system should consist of one re-seatable relief valve and one rupture disk in parallel. Dewars should be equipped with rupture disks set for pressures about ____ percent above the working pressure of the vessel.
25 % TO 15X-1-1 P 5-4
48
Oxygen cylinders, when empty, are required to have ___ to ___ pounds per square inch gauge(psig) pressure
5-24 TO 15X-1-1 p 5-4
49
What do you do with parts removed from the lox cart for maintenance
Sealed in polyethylene bags and all anti seize tape must be removed and replaced on threaded parts. When replacing anti seize tape start with the 3rd thread from the end Navair 19-25D-33 p.65
50
What do you clean and dry LOX cart tank integral parts(breathing oxygen equipment) with
Clean-ultrasonic cleaning with solvent, agitate Drying-purge and blow dry components with oil free gaseous nitrogen NAVAIR 19-25D-33 p. 121
51
How long do you pass hot dry nitrogen through the TMU/27 cart tank during a hot purge
At least 2 hours at moderate flow NAVAIR 19-25D-33 p. 122
52
What should the pressure be regulated to for the aircraft inner tank otherwise the use of the overboard vent system is required
5-40 psi T.O. 37C2-M.-127 p. 4-1
53
Apply tape to male pipe threaded fittings beginning with the _____ thread from the end of the fitting
Second This is for shipping a lox storage or transfer tank. Im not sure if this is for the the fittings on the aircraft system or the tank being transferred Navair 19-25d-33 says third thread on TMU/27 cart. T.O. 37C2-8-1-127 p.3-1
54
What do you do with the lox and pressure in a tank being shipped
Purge all lox and charge tank with 15-25 psi of nitrogen T.O. 37C2-8-1-127 p. 3-1
55
What manual hold the LOX safety precautions that all personnel shall adhere to
TO 15X-1-1 TO 1C-27J-2-2CL-4 p. 3
56
LOX boil off can be reduced by positioning the storage tank how
The rear end is higher than the front end MPC 350020.0 p.8 Note
57
Due to the high volume of gaseous oxygen required for purging, it is recommended that when using the LMO5HP liquid oxygen storage cylinder, it should not be more than _____ percent full.
75 percent MPC 351010.0 p. 4
58
Position LMO5HP liquid oxygen storage cylinder (1) approximately ___ feet from aircraft oxygen servicing panel
15 ft MPC 351010.0 p.4
59
EQUIPMENT SUPPLYING GASEOUS OXYGEN FOR HOTPURGING MUST HAVE SUFFICIENT QUANTITY TO MAINTAINA CONSTANT FLOW AT 90 PSI FOR how long
100 minutes MPC 351010.0 p. 4
60
Ensure electrical power cart has enough fuel to supply power for at least ____ minutes.
90 minutes 351010.0 p. 4
61
How far do you position the power cart from the LMO5HP liquid oxygen storage cylinder.
50 ft MPC 351010.0 p. 4
62
How far do you position the LMO5HP liquid oxygen storage cylinder from the aircraft being serviced
15 ft MPC 351010.0 p. 4
63
How soon after a hot purge do you service liquid oxygen system
Within 1 hour IAW MPC 121401.0 MPC 351010.0 P.6
64
How much dwell time do you allow after LOX servicing
30 minutes MPC 351010.0 p. 7
65
How long do you purge the demand side of oxygen system
10 minutes MPC 351010.0 p.7
66
Oxygen cylinders and LOX containers should have their psi dropped to how much for shipping commercially
24 psi TO 15X-1-1 p 3-2
67
Air pressure should be regulated to less than what psi when using compressed air in the LOX environment
30 psi TO 15X-1-1 P XVII
68
The greatest danger during flight of lack of oxygen is at what altitudes
Between 20,000 and 30,000 ft TO 15X-1-1 P 1-5
69
Without oxygen at what altitude is night vision subnormal
10,000 ft TO 15X-1-1 P 1-5
70
After thoroughly cleaning oxygen components how do you check cleanliness
Under a black light TO 15X-1-1 P 2-1
71
Any cleaned parts that are stored more than ____ days prior to assembly shall be recleaned
30 days TO 15X-1-1 P 2-1
72
In those areas where spillage of LOX is likely to occur, the ventilation equipment shall have the capacity to provide ____ to ____ air changes per hour.
20-40 TO 15X-1-1 P 2-1
73
What is considered to be the minimum size for an oxygen shop
1000 square ft TO 15X-1-1 P 2-3
74
For easy record keeping all charts, graphs, records, and other required material should be located within ____ feet of the desk.
3 ft TO 15X-1-1 P 2-7
75
There are three types of oxygen flight stations. What are they
Demand type, pressure demand type, and continuous flow type TO 15X-1-1 P 3-1
76
How do you distinguish between high pressure and low pressure cylinders
Low- yellow 300-475 psi High- green 1800-2100 psi TO 15X-1-1 P 3-3
77
What is the chief advantage of a high pressure cylinder
Minimum amount of space utilized TO 15X-1-1 P 3-3
78
How are aircraft oxygen lines marked
Late models- marked with a single green band Early models- marked with a band colored light green-yellow light green and distribution lines marked with a band colored light green TO 15X-1-1 p 3-16
79
How many threads do you apply anti seize table to for pipe tubing
First thread in the direction of spiral TO 15X-1-1 p 3-18
80
ABO has a minimum purity disregarding moisture content of what percentage by volume
99.5 TO 15X-1-1 p 5-1
81
To remove residue from oxygen lines and fittings use a suitable cleaning compound and how do you dry
Air dry or force dry with heated nitrogen TO 15X-1-1 p 5-2
82
Oxygen cylinders depleted to what psi must be tagged out and segregated from other cylinders
5 psi TO 15X-1-1 p 5-4
83
For oxygen systems, how often should you change the purifier cartridge
Every 16 cylinders ( or every 2 carts) TO 15X-1-1 p 6-1
84
Any flame producing activity shall not be performed within how many feet of servicing activity
50 ft TO 15X-1-1 p 6-8
85
What size should the drip pan or sheet of metal be for overflow
4 x 4 ft TO 15X-1-1 p 6-9
86
How many turns of anti seize tape do you apply to the threads of the cylinder regulator
2 turns to all threads but first 2 male threads TO 15X-1-1 p 7-1
87
Oxygen system post and pre flight inspects should be done with what requirements
Ch 7 of TO 15X-1-1 Manual TO 15X-1-1 p 7-3
88
How often should LOX systems be hot purged
200 hours TO 15X-1-1 p 7-66
89
What size limit on high pressure bottles require no hydrostatic testing
Less than 2 in diameter and less than 24 in length TO 15X-1-1 p 7-68
90
What is the oven temperature set to for drying oxygen systems
122 C, 250 F TO 15X-1-1 p 8-3
91
As a safety precaution to avoid the possibility of electrical power being applied or disturbance of static grounds during servicing of liquid oxygen (LOX) systems Two signs each should be placed approximately ____ (ft) from the right and left side, with one at the forward end of the aircraft and the second sign at the rear.
20 ft
92
In aircraft having the filler lines connected on one end of the cylinder and distribution lines connected to the opposite end of the cylinder, purging will be accomplished by connecting a servicing trailer to the aircraft filler valve and with all regulators open, passing oxygen through the system for at least ____ minutes with apressure of 50 psi at the filler valve.
30 minutes TO 15X-1-1 P 9-4
93
when transporting lox converters The effected equipment is designed to endure forces fully serviced of ____ G vertically downward, ____ G vertically upward, and ____ G laterally. Forces greater than those stated may be considered as damaging.
14 G 6 G 10 G TO 15X-1-1 P 9-6
94
When transporting lox converters A suitable vehicle for transporting the equipment is a pickup or an equivalent vehicle with an open bed that will accommodate an isolation container to protect personnel and other equipment. The speed of stated vehicle should be limited to ____ MPH when transporting the converters and rough terrain should be avoided.
15 TO 15X-1-1 P 9-6
95
How long is the evaporation or heat loss tests on LOX converters
24 hours TO 15X-1-1 p 9-15
96
What is the criteria for the bands on oxygen tubing identifying burnished areas
Minimum of 2 inch max of 3 in. Black tubing gets a green band and green or unfinished tubing gets a black band TO 15X-1-1 p 9-16
97
What is the minimum purge time for the 5 and 10 liter converters
5 L- 20 minutes 10 L- 30 minutes 25 L and 75 L- 45 minutes Plug power cable of purge kit into any source of 115 V ± 5 V, 60 or 400 cycle, with outlet rated at 1,200 watts minimum. TO 15X-1-1 p 9-21
98
When purging a converter 10 L or less what psi do you regulate the source supply pressure regulator to 25 L or more
100 +- 10 psi 130+- 5 TO 15X-1-1 p 9-24, 9-30
99
The converter weight shall be calibrated to what
12 ounces of specified limit TO 15X-1-1 p 9-25
100
When inspecting the cleanliness of lox components how is the bright white light test completed
Light of 100 ft candles, hold the flashlight no more than 18 inches away TO 15X-1-1 p 10-1
101
Cylinders coded 3A or 3AA by the Department of Transportation (DOT) specification, Title 49 have a service life limit of how long
No life limit TO 15X-1-1 p 7-68
102
Cylinders coded 3HT require a hydrostatic test every ____ years and must be condemned at ____ years
Hydro-3 Condemned- 24 TO 15X-1-1 p 7-68
103
Welded cylinder do not require a dot stamp or life limit but do require hydro every ____ years
5 years TO 15X-1-1 p 7-68
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