System requirement

- The lox system shall be able to liquefy oxygen.

Physical requirements 

- The pipes shall be able to withstand the temperatures and pressures that exist at the points.

- Temperature that shall be withstood: 
- Pressure that shall be withstood:

The different temperatures and pressures are listed in the figures below:

 Fig-1-

Table -1-

- The heat exchanger shall be able to decrease the temperature of the oxygen in order to become close to liquefaction temperature at the pressure present.

The temperature that must be reached: -120°C (154 K) @50bar.

- The cooler (Kelvinator refrigerator) shall be able to supply a temperature that is low enough.

The temperature that shall be reached: -80°C (193K).

- The separator shall be sufficient in volume to allow the gas expansion.

- The separator shall be able to separate the oxygen gas from the liquid oxygen.

- The heater shall be able to warm the cryogenic gas, so that their temperature is suitable for entering the compressor.

Chemical requirements 

- The compressor shall be free of oil (oil-free) to avoid its reaction with oxygen.

Mechanical requirements 

- The material of the pipes shall be made a Copper (the ideal shall be made a stainless steel)

- The dimensions of the pipes that shall be: 

      Diameters are listed in the figure below:

Fig-2-

- The compressor shall be able to increase the pressure of the gas to the required level, from -15°C (258K) @1bar (inlet temperature) - ambient temperature @50bar (outlet pressure).

- The sensors shall be able to measure in the temperature and pressure range, shows in Fig -1-.

- The expansion valve (solenoid valve with separator) shall be able to drop the pressure abruptly, from 50 bar to 1 bar.

- The mixer shall be able to introduce an appropriate amount of fresh oxygen gas into the system; the amount of fresh oxygen gas added shall be equal the amount of liquid oxygen, taking into account the effect of the temperature difference.

- The filter drier shall be able to dry the oxygen gas before entering the compressor.

- The thermal insulation material shall be able to isolate pipes and components from any heat leakage.

- The thermal insulation material shall be made a fiber glass (the ideal thermal insulation shall be made a Flexible EPDM).

- The separator shall be made of stainless steel.

- The LOx system shall be design according to " LOx Mechanical Design ".

Automation requirements

- The sensors shall be able to be controlled from the GUI.

- The valves shall be able to be controlled from the GUI.