GASEOUS OXYGEN SYSTEMS:
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Sparks, static electricity or shock may start oxygen combustion.
+ additional oxygen will make a fire burn much faster and more violently.
- If possible shut off flow of oxygen.
- Remove everyone who is not actively engaged in fight the fire.
- Use large quantities of water to cool the burning material below the ignition point.
- If electrical equipment is involved in the fire. Use carbon dioxide or vaporizing.
- Dry chemical extinguishers: DO NOT USE WATER.
Safety Precautions [GASEOUS OXY SYS]
- aviators breathing oxygen.
- process heats and cools air to remove moisture and other impurities.
+ refined until it it 99.5% pure.
Colorless, Odorless & Tasteless
Moisture freezes @ 32 degrees F, if not removed from the oxygen system, will freeze valves & regulators.
Hospital oxygen is only 98% pure and welding oxygen is only about 70% pure.
Gaseous Oxygen System
- not enough oxygen in the blood stream.
+ can be corrected by breathing oxygen.
+ Different Altitudes - Different Affects
+ Dangerous creeping on you w/o you realizing it.
- occurs when too much oxygen is lost in the body and body tissues are permanently damaged.
- breathing too much; too much oxygen in the body leading to an abnormal loss of carbon dioxide from the blood.
- person’s body gets stiff and will “freeze”.
+ corrected by breathing into a bag.
- made of stainless steel or low alloy steel.
+ built to carry a maximum charge of 450 psi.
+ are considered full between 400 to 425 psi.
+ made shatterproof.
+ Painted YELLOW.
- Never let our systems go down to 0 PSI to prevent contamination.
Low Pressure Gaseous Oxygen Cylinders
- used in a low pressure system is made of 5/16 inch, aluminum alloy.
+ has identification tape on it.
+ tape is color coded green & white saying “ BREATHING OXYGEN” on it.
- braced w/ clamps every 15 inches & at each bend throughout the sys.
- Should be minimum of 2 inches clearance between the tubing & cables or electrical wiring.
- used in low pressure sys. are made of aluminum alloy & color coded BLUE to ID the material it’s made of ( aluminum )
- 3 Distincts Sections:
+ Pipe Thread End of the screws. : used when connecting tubing to components
regulators/ converters etc.)
+ Flared end connects the flared tubing
+ Hex Portion of the Fitting (where you place a tool to remove or install it)
- Used in oxygen systems that has more than one cylinder.
- oxygen will flow to the regulators even if one cylinder is ruptured.
+ Allow oxygen to flow in one direction only.
- Used when recharging the oxygen system.
STRICTLY LOW PREESURE.
+ usually located close to the edge of an access panel or right behind a special removable cover plate on the skin of the aircraft.
+ spring loaded check valve that is unseated when the recharge adapter is connected to it and seats when the adapter is removed.
- part of the servicing cart.
- you need to use it whenever you are filling a low pressure system from a high pressure servicing cart so the pressure will not bust the low pressure cylinders & lines on the acft.
- never will low pressure sys. from high pressure, servicing cart w/o using a pressure reducing valve.
+ Prevents High Pressure From Bursting Low Pressure.
Pressure Reducing Valve
- two of them installed on the acft.
+ one shows aircraft cylinder pressure and one shows system pressure.
- sys. pressure gauges generally installed on the oxy. reg.
- Most have a RED mark on the glass cover @ 450 psi to show maximum service pressure.
- purpose of it is to tell you if oxygen is flowing through the regulator.
+ does not tell you how much oxygen is flowing
+ nor does its operation guarantee that you are getting enough oxygen.
- indicates flow by blinking action when the user inhales through the oxy. mask.
- black = NO OXY
+ white + OXY FLOWING
- works the same as low pressure sys.
+ more oxygen can be stored in a smaller space.
- but stored at a higher pressure, 1850 PSI.
High Pressure Oxygen System
- made of forced seamless steel.
- made shatterproof by wire wrapped on the outside of the cylinder.
+ then dipped by solder.
- hold max charge of 2000 PSI.
+ normally served to a pressure of 1800 to 1850 PSI.
- painted GREEN to ID them.
- hydrostatic test every eight years.
+ Last inspection is stamped on neck.
+ assembly is attached to the oxygen tubing connected to the valve outlet.
- automatic valve
+ coupling unseats check valve, allowing oxygen from the cylinder to fill the oxy sys. under high pressure.
- spring loaded check valve
Self Opening Valve Coupling -
- manually operated
+ should always be in the open position when it is in the aircraft.
- should be closed when removing or replacing parts on the oxy sys.
+ & when the cylinder is to be removed from acft.
Hand-Wheel Valve -
- Both Valves are equipped w/ it.
+ will release the contents of the cylinder.
- in the event the pressure becomes excessive due to high temps.
Fusible Safety Plug
(high pressure gaseous oxygen sys.)
+ all tubing between the filler valve and the pressure reducing valve (high pressure side)
- 3/16 inch copper alloy or any tubing can withstand high pressure.
All tubing in (low pressure side) is 5/16 inch aluminum alloy. (after pressure reducing valve)
- consist of a sleeve, which is preset on the end of the tubing before the tubing is put in a flare less seat.
+ high pressure fittings are made of steel or brass.
- if you over tighten this type of fitting while trying to stop a leak.
+ it will usually leak more.
- A torque wrench should always be used with this type of fitting.
- high pressure **** is hand wheel operated & separates the filler connection, from cylinders.
+ valve must be opened when the system is being filled w/ oxygen & is closed at all other times.
- filler connection is used to hook the recharging equipment to the acft sys.
work the same in high pressure sys as they do in low
+ but are made of steel or brass to withstand high pressure.
- used in the high pressure oxygen system is placed between the cylinders & the pressure reducing valve.
+ manually hand wheel operated.
- safety wired to the “ON” position.
+ (in case of an emergency) valve can be closed to isolate the distribution sys. from the cylinders.
- also can be be closed when maintenance is done on the system.
+ valve should always be left in the “ON” position & safety wired.
System Shutoff Valve
- used in the high pressure oxy. sys. to drop the cylinder pressure to a bout 400 PSI before it goes in the regulator.
+ Do not confuse w/ the one on the servicing cart.
- has a relief section (in regulator) that vents the pressure overboard if the reducing section fails to work.
Pressure Reducing Valve
- is used to show cylinder pressure
+ located before the pressure reducing valve
- reads from 0 to 2000 PSI w/ increments of 200 PSI marked on the dial.
Regular Gauge : SYSTEM PRESSURE
Low Pressure: Same High Pressure: In Tanks
- lets the user know that oxygen is flowing through the regulator.
- when user takes a breath of oxy. , a white “flag” attached to a diaphragm shows through a glass window on the face of the regulator.
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