  
Hazards in Confined Spaces
| Oxygen deficiency: |
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can be caused by several processes: |
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Consumption |
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Oxygen is used up by the person who is in the confined space and turned into carbon dioxide. |
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Displacement |
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Denser materials push the oxygen out of the occupied space. An example of this would be insulating gas present in the tank. |
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Reaction |
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Oxygen is reacted with other materials to make other compounds. Example of this would be the rusting of the iron walls in the tank or the use of a torch.
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