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independent breathing apparatus. Victims need rest, warmth and even artificial
respiration. Keep the respiratory tract unimpeded, monitor the blood circulation, and
perform heart massage if necessary. If being unconscious, the patient should be kept in a
lateral position when being placed or moved, waiting for the diagnosis of doctor.
2.10.2 Oxygen (O
2
)
Chemical and physical properties and instructions for use.
Though being un-flammable, the oxygen can contribute to the combustion. Although
the oxygen is 11% heavier than the air under the environmental temperature, the
concentration of the oxygen close to the ground will not increase as the air does not
separate. The temperature of the liquid oxygen is very low (-183 ° C under the
atmospheric pressure). The skin will be damaged by the "cold burning" phenomenon
quickly if being contacted with the oxygen at such temperature. Some materials will be
likely to become fragile under low temperatures.
Warning in case of fire or accident
The increase of oxygen content in the air will significantly increase the fire risk (even
if increased by a very low percentage). Materials which are nonflammable in air (including
insulated flame-resistant materials) will burn fiercely or even cause spontaneous
combustion in oxygen-enriched air. In such condition, flame temperature will be higher
and the fire will spread quickly.
Health precautions
The volume ratio of oxygen in air is 21% under the natural condition. Therefore,
oxygen escaping into the air will not incur pollution. In most cases, harmful effects will not
be caused to the human body if pure oxygen or air with high oxygen content is inhaled.
Good ventilation should be guaranteed for clothes to be dressed in environments with
possibly high oxygen content. Oxygen shows a strong adsorption capacity to clothes. Fire
sources including cigarettes may fire the clothes. Low-temperature liquid oxygen will not
pollute the floor when it spills by accident, because it will evaporate instead of penetrating
into the ground, or will penetrate in a small volume at most. Temporary local freezing of
the ground will not cause any continued damage.
2.10.3 Compressed air
General safety pre-warning
1． Operators should follow safe operating mode and all relevant local occupational
safety regulations and rules.
2． If the following instructions are inconsistent with relevant local regulations, the
stricter one’s hall prevail.
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