Yunku Industrial Safety

The so-called confined space refers to a space that is closed or partially closed, relatively isolated from the outside world, with narrow entrances and exits, where operators cannot work inside for long periods of time, and where there is poor natural ventilation, which is likely to result in the accumulation of toxic, hazardous, flammable and explosive substances, or where the oxygen content is insufficient.

The definition of a confined space requires that all four of the following conditions be met simultaneously

1. It is not designed as a fixed workplace;

2. Has limited or restricted access and egress;

3. It is liable to cause the accumulation of toxic, hazardous, flammable and explosive substances or insufficient oxygen content;

4. There is a possibility and a need for personnel access.

Poor ventilation can easily cause the accumulation of toxic and flammable gases and lack of oxygen, etc.; this feature is the main cause of fatal accidents in confined spaces, and hydrogen sulphide is common among toxic and hazardous gases; therefore, it is necessary to ensure that there is enough harmless air in the confined space firstly before entering the confined space.

For certain confined spaces, the complexity of the internal structure is also a cause of accidents.

Internal inherent risks that produce hazards where it is not easy for people to escape or rescue are the main hazard mechanisms.

The space between the operating parts of machinery is not a confined space.