How to distinguish confined space operations

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How to identify confined space operations from non-confined space operations in daily supervision. (The following are suggestions for distinguishing between legitimate and illegal confined space operations, for reference only.) The following locations fall outside the scope of regular supervision for confined space operations and can be excluded: 1. Elevator shafts ； 2. Water curtain cabinet ； 3. Ordinary sewers (with low water levels and non-toxic, harmless substances); 4. Ventilated painting booths ； 5. Open-air ponds, enclosed ponds, ponds with only a water intake (the size of the intake is not large enough for a person to enter) ； 6. Septic tank (the well opening is sealed, with only a sewage pumping port left, and its size is not sufficient for anyone to enter) ； 7. Dust-free workshop (equipped with ventilation facilities) ； 8. Facilities and equipment that do not require human entry (which, although they meet the characteristics of confined spaces, do not need to be entered by people for operations; maintenance work can be carried out from outside the equipment) ； 9. Underground oil storage tanks at gas stations. II. Terms and Definitions for Work in Confined Spaces 1. A confined space, also known as a restricted space or enclosed space, refers to a space that is closed or partially closed, isolated from the outside world, with narrow entrances and exits, and which is prone to the accumulation of toxic and harmful substances, flammable and explosive materials, or insufficient oxygen levels. 2. Work in confined spaces refers to the operational activities carried out by workers when they enter such spaces, and these activities include construction, maintenance, repair, cleaning, etc. III. Enterprises must maintain a register of work carried out in confined spaces in the following locations: 1. Sewage tanks (wastewater treatment systems); 2. Pulp tanks (papermaking); 3. Pickling tanks; 4. Pools with narrow entrances, as well as fire suppression tanks. (The entrance is large enough for people to enter.) 5. Central vacuum cleaner (people can enter it). 6. Boiler (requires regular access by personnel to inspect the furnace interior). On a regular basis