Due to advances in medical care, liquid oxygen is starting to be used for certain types of breathing difficulties. Whilst the risks are generally the same as bottled oxygen great care needs to be taken.
The following information is derived from a North East Fire and Rescue Services Guidance Note. (The paragraph references relate to that document)
1.0 BACKGROUND
Liquid oxygen is normally found in industry; however it is starting to be used in domestic situations to assist people with acute breathing problems.
Its use is very rare as it is not available on the NHS, however this will change in 2005 and its use will therefore become more prevalent.
Users of liquid oxygen are advised to inform NFRS of its use and location, however this is advisory only. Where NFRS become aware of its presence, this will added to the turnout instructions.
2.0 PROPERTIES
Liquid oxygen is stored in liquid form at temperatures of –180oC
Its properties are the same as normal oxygen, i.e. Colourless and odourless.
Hazards are:
Will accelerate combustion and increase the risk of fire and explosion.
Prolonged inhalation of high concentrations may cause coughing and lung effects.
Contact with liquid will cause frostbite and freeze burns to exposed tissue.
Heating of the container may cause it to explode.
3.0 DOMESTIC UNIT
The domestic unit is a detailed in the photographs below. The main unit is also used to re-charge a small portable unit to allow the user to move around freely.
PRECAUTIONS
Avoid liquid
Allow any spills to evaporate
Keep upwind
Keep container cool if involved in fire
Wear chemical protective clothing and breathing apparatus
Avoid ignition sources and use non-sparking tools where attending a leakage
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