Why is working in a confined space more hazardous than working in other workspaces?
Many factors need to be evaluated when looking for hazards in a confined space. There is smaller margin for error. An error in identifying or evaluating potential hazards can have more serious consequences. In some cases, the conditions in a confined space are always extremely hazardous. In other cases, conditions are life threatening under an unusual combination of circumstances. This variability and unpredictability is why the process of hazard and risk identification and assessment is extremely important and must be taken very seriously each and every time one is done.
Some examples include:
The entrance/exit of the confined space might not allow the worker to get out in time should there be a flood or collapse of free-flowing solid.
Self-rescue by the worker is more difficult.
Rescue of the victim is more difficult. The interior configuration of the confined space often does not allow easy movement of people or equipment within it.
Natural ventilation alone will often not be sufficient to maintain breathable quality air. The interior configuration of the confined space does not allow easy movement of air within it.
Conditions can change very quickly.
The space outside the confined space can impact on the conditions inside the confined space and vice versa.
Work activities may introduce hazards not present initially.
Lack of communication between the workers in the space, the attendant and the emergency response team.
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