Oxygen

Question 0

Oxygen Rules Part 2

Answer 0

1. servicing control valves shall not be opened more than 3/4 of a turn
2. temp in O2 shop must be kept b/w 65-75 F, below 50% humidity
3. tools shall be marked “OXYGEN USE ONLY”
4. room must have at least 10 air changes per hour
5. low pressure(50-500 PSIG) used in HC-130
6. high pressure(50-1850 PSIG) used in HU-25

M13520.1C p 5-6, 5-7

Question 1

Oxygen rules

Answer 1

1. aviators breathing oxygen-bottles will be green with a 3in white band around upper circum. of cylinder
2. it shall have “OXYGEN AVIATOR’S” stenciled parallel to the longitudinal axis and on diametrically opposed sides in 2in letters
3. pressure in oxygen supply cylinders which replenish aircraft oxygen cylinders shoulod not fall below 50psi, if so label empty, fall below 15psi they shall be removed from service for heat vacuum treatment
4. two people are required to service O2, one person shall be stationed at the control valves of the servicing equipment and the other to observe the pressure in the emergency bottle.

M13520.1C 5-4

Question 2

Gaseous Oxygen characteristics

Answer 2

1. high pressure bottles are full at 1800psi, and low pressure full at 300psi
2. aviator and medical O2 are different. Med O2 contains more moisture that would freeze and plug lines.
3. O2 increases with altitude
4. slightly heavier than air than air
5. colorless, odorless, tasteless

TO 00-25-172 p. 4-13

Question 3

What tape must be used for fittings

Answer 3

only approved anti-seize because of temperatures, pressures, and fire hazards.

TO 00-25-172 p. 4-13

stainless steel flared- mil-m-7866 molybdenum disulfide
aluminum or magnesium fittings- mil-t-27730 teflon tape

M13520.1C 5-9

Question 4

Where do you not park oxygen carts

Answer 4

areas that are sodded, grassy, or asphalt covered

exception: LOX carts can temporarily be parked on asphalt given proper drip pans are in place

Question 5

Parking or storing regulations for Gaseous oxygen carts and LOX carts

Answer 5

1. 25 ft from structures having fire resistant or non-combustible exterior
   walls or with fire extinguishing systems
2. 50 ft from any combustible structure or sources of ignition, such as
   heavy traffic areas, areas where equipment is in operation and smok
   -ing areas
3. 75 ft from parked and 25 ft from FSSZ’s

TO 00-25-172 p. 4-13/14

Question 6

What is the correct ft away from taxiing aircraft for servicing oxygen?

Answer 6

50 ft( measured from wing tip or closest point of taxiing aircraft to the pressurized oxygen servicing equipment)

TO 00-25-172 4-14

Question 7

Can you service an aircraft that is adjacent to a parked aircraft that has engines running?

Answer 7

no unless the closest point of the adjacent aircraft is more than 50 ft from the pressurized oxygen servicing equipment

TO 00-25-172 p.4-14

Question 8

When servicing low pressure oxygen systems what is the maximum allowed pressure regulated to on the valve setting?

Answer 8

475 psig

a relief valve preset of 475 psig shall be installed on the low pressure side of all oxygen service carts

TO 00-25-172 p. 4-14

Question 9

To avoid heating by sudden compression, open and close all high pressure oxygen valves slowly. If two valves are to be opened which do you open first?

Answer 9

the down stream valve

TO 00-25-172 p.4-14

Question 10

What PPE shall be worn by all persons servicing oxygen at aircraft connection point

Answer 10

safety goggles, safety glasses with side shield, or face shield

TO 00-25-172 p 4-15

Question 11

How must the climate and environment be maintained for the oxygen shop

Answer 11

Temperature between 65 and 75 degrees F and humidity below 50%

M13520.1C 5-6

Question 12

Oxygen shop ventilation and exhaust

Answer 12

Mechanical exhaust fans capable of providing a minimum of 10 air changes per hour shall be used.

Oxygen is 10% denser than air

M13520.1C 5-7

Question 13

Transformer banks shall be located a minimum of __ ft from transfer shop or storage areas

Answer 13

50 ft

M13520.1A 5-7

Question 14

What type pen is permitted in the oxygen work area

Answer 14

ball type pens

M13520.1C 5-8

Question 15

What are some personal cleanliness requirements during oxygen equipment maintenance

Answer 15

1. solvent contact with the skin should be avoided
2. fingernail polish shall be removed prior to entering shop
3. personnel with skin and/or upper respiratory diseases should
   not be allowed to work in the overhaul shop area
4. personnel with colds, temporary coughing, sneezing, and severe
   sunburn should be assigned temporary jobs outside the shop until
   they have sufficiently recovered

M13520.1C 5-8

Question 16

How many cylinders are mounted on the gaseous oxygen servicing trailer

Answer 16

08

M13520.1C 5-10

Question 17

Where do you reference electrical equipment requirements in oxygen maintenance shop

Answer 17

All electrical equipment and electrical wiring shall be procured and maintained in accordance with NAVFAC Specification 9Y (latestrevision).

M13520.1 p 5-10

Question 18

How far away should oxygen storage be from transformers

Answer 18

Transformer banks shall be located a minimum of 50-feet from transfer shop or storage areas.

M13520.1 p.5-11

Question 19

What station on the aircraft is where the oxygen shutoff valve is located and other oxygen components

Answer 19

FS 245

Multiple MPCs

Question 20

What do you reference for oxygen system purge procedures

Answer 20

MPC 351010.0

CGTO 1C-130J-2-35JG-00-1. P. 3

Question 21

How many portable oxygen bottles are on all coast Guard C-130 aircraft

Answer 21

4- one each at the pilots position and co-pilots position, on the aft side of the 245 bulkhead, and in the cargo compartment aft of the right wheel well

CGTO 1C-130H-2-35GS-00-1 p.4-1

Question 22

How should oxygen hoses on the C-130H be supported to prevent a tripping hazard which could interfere with the performance of duties or emergency egress from the aircraft

Answer 22

From the ceiling

TO 1C-130H-2-35GS-00-1 p.2-1

Question 23

The LOX quantity indicator receives what from the AC instruments and engine fuel control bus

Answer 23

115 volt, single phase, 400 Hz AC power

There are 2 circuit breakers LIQUID OXY QTY NO.1 and NO.2

TO 1C-130H-2-35GS-00-1. P.2-7

Question 24

How are the plumbing lines marked

Answer 24

Late model aircraft have all oxygen lines marked with a single green band. Early model aircraft had the filler lines marked with a band colored light green greenyellow-light green and the distribution lines marked with aband colored light green. TO 15X-1-1 p. 3-16

Question 25

What size are the replacement nylon straps for the metal bands on the cylinder bracket for the portable units

Answer 25

10 in and 16 in TO 15X-1-1 p. 4-5

Question 26

When does the LOX gauge need calibration

Answer 26

If it does not read the amount of supply expected when full,(i.e. 5, 10, 25, or 75 liters) by within 10 percent, then either the LOX converter is not full, or the LOX quantity gauge needs calibration or replacement. TO 15X-1-1 p 4-7

Question 27

Oxygen cylinders and LOX containers should have their psi dropped to how much for shipping commercially

Answer 27

24 psi TO 15X-1-1 p 3-2

Question 28

When transferring LOX, do not leave valves completely open. This may cause the valves to freeze in the open position. To Prevent this, valves should initially be completely opened, then immediately closed approximately how much

Answer 28

1/4 turn M13520.1C p 5-6