LIQUID OXYGEN SYSTEM

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Author:
carLORENZ0
ID:
258001
Filename:
LIQUID OXYGEN SYSTEM
Updated:
2014-01-23 04:23:42
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  1. - is the main part of a liquid oxy. sys. 

    + multi-function unit made to receive & store the liquid. 

    + designed to provide gaseous oxygen to user.
    Converter Assembly
  2. - is the largest part of the converter assembly. 
     
    + double walled vacuum insulated unit that consists of an inner & outer shell separated by rubber grommets. 

    - liquid is stored in the inner shell and a vacuum separates it from the outer shell.
    Converter
  3. -  is necessary to keep the oxygen in a liquid state.

    vacuum will prevent heat transfer, by means of convection, from taking place. 

    this will prevent the liquid from boiling off into a gas. 

    + rupture dis is mounted on the outer shell of converter. 
    - acts like a safety device 
    + if inner shell develops a leak the rupture disc would flow to relieve the built-up pressure. 
    - pressure setting of rupture disc will vary, depending on the size of the converter. 
    + Always check the applicable T.O. for the correct setting.
    Vacuum
  4. - inner shell leaks 

    + Blows to relief Annual Pressure.
    Rupture Disc
  5. : Spring Loaded Closed Valve

    + prevents the reverse flow of lox from the bottom of converter.
    Ball Check Valve
  6. - combination fill, build-up & vent valve 

    - a dual function valve. 
    - fill portion of the combination valve has coupling for the filler nozzle of a LOX servicing cart to connect to. 

    - Two POS: of the combo valve are build-up and vent.

    - valve is normally in the build-up position. 
    - build-up port is connected to the pressure closing valve.
    Combination Valve
  7. - used to change the liquid oxygen into a gas for the purpose supplying head pressure. 

    + located on the container assembly.
    + Gas used to force the liquid 
    - PAIRED W/ PRESSURE CLOSING VALVE
    Build- Up Coil
  8. - main purpose is to maintain constant gas (head) pressure on top of the inner shell of the converter. 

    - by maintaining head pressure: 400 PSI; it acts as the pressure reg. for the liquid oxy sys. 

    + bellows in it senses gas (head) pressure & will open or close depending on head pressure. 

    - PAIRED W/ BUILD UP COIL
    Pressure Closing Valve
  9. - will relieve excessive pressure form the converter.

    + Supply Line Backs IT up.
    Converter Relief Valve
  10. - used on some converters for fast removal & replacement of the converter. 

    + disconnects provides a method of disconnecting the converter from the aircraft, & reinstalling it in minutes. 

    + spring-loaded check valve to prevent the loss of oxygen. 

    - not installed on Aircraft.
    Vent Line & Supply Line Q/Ds
  11. - relives excessive pressure in the aircraft mounted supply line and warm up coils (warm up plate). 

    + also relieve excessive pressure if the converter relief valve fails when the converter is installed on the acft.
    Supply Line Relief Valve
  12. - purpose is to raise the temps of the gaseous oxy. to where it is suitable for breathing. 

    + coil is usually found in cockpit or electronics compartment. 

    - as oxygen passes: it absorbs heat from the surrounding air.
    + raising temperature of the gaseous oxygen before it does to the oxygen regulators.
    Warm-Up Coil/Plate
  13. - a pressure-sensing, bellows-operated switch. 

    + is connected to the gasesous oxygen supply tube between the warm up coil & oxygen regulator. 

    - if pressure becomes too low: the contacts close completing a circuit and turning on the oxygen low light located in the cockpit.
    Oxygen Low Pressure SW
  14. - 2 Types: Pressure Demand & Continuous Flow Type Regulators. 

    Regulators flow to oxygen to the user
    Oxygen Regulators
  15. - it delivers oxygen to your lungs in response to the suction of your own breath, that is, on demand. 

    + supplies to one crew member only. 
    - diaphragm operated valve. (demand valve)
    + closes when you exhale.
    Pressure Demand Regulator
  16. -  purpose of this regulator is to deliver a continuous flow of oxygen to the users mask, at a rate of flow. 

    + manually controlled .
    Hand Adjustable Types [Continuous Flow Regulators]
  17. - are used in the aircraft that transport personnel, such as passengers, troops, or litter patients. 

    + supplies continuous flow of oxygen automatically regulated  by an aneroid for increasing oxygen flow w/ increasing altitudes. 

    - no manual controls or flow indicator.
    - at least two regs are used for any type of installation.
    Automatic Type [Continuous Flow Regulators]
  18. - uses a variable capacitance probe that is looted in the inner shell of the converter. 

    - insulating material separating two conducting plates is DIELECTRIC. 
    - Measures the liquid level in the inner shell 
    - its a SIGNAL - as liquid level changes
    Variable Capacitance Probe
  19. - receives the signal from the probe and turns it into a liquid level indication. 

    - calibrated in liters. 
    - also will turn on a warning “ OXY LOW” when the LOX supply is at 10% of the converter capacity. 

    + located in cockpit/flight deck. 

    - signal passes mean or a shielded electrical lead & coati cable
    Capacitance Gauge
  20. -  located on the TEST panel in the cockpit is a single-pole double-throw SW that provides a self-test of the oxygen indicating and warning system. 

    + CCW 10% converters holds oxygen low LIGHT will come ON.

    + Pressure reg gauge, indicates sys pressure.
    Low Quality (TEST) SW

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