What is a significant hazard associated with an oxygen enriched atmosphere in confined spaces?

A significant hazard associated with an oxygen-enriched atmosphere in confined spaces is indeed extreme fires. When the concentration of oxygen in the air exceeds 21%, the risk of combustion increases dramatically. Materials that are normally not considered flammable can ignite more easily in such environments, leading to the potential for rapid and intense fires. The presence of elevated oxygen levels supports combustion and can lead to fire hazards that are much more severe than those in normal atmospheric conditions.

This understanding is crucial for anyone working in or around confined spaces, as it directs attention to the specific safety precautions that must be taken in these environments, such as monitoring oxygen levels and implementing proper fire prevention measures.