1. Firstly, we need to introduce the toxic gas components present in enclosed spaces:
Highly concentrated toxic and harmful substances are prone to accumulate in confined spaces. Toxic and harmful substances may already exist in confined spaces or gradually accumulate during the operation process. Common toxic and harmful substances include hydrogen sulfide, which is easily produced during cleaning, dredging of sewers, septic tanks, manholes, sewage tanks, cellars, and other operations; Carbon monoxide, if gas pipelines are accidentally damaged during municipal and road construction, causing gas leakage into confined spaces or nearby residential areas, can lead to the accumulation of carbon monoxide; Benzene, toluene, xylene, and other organic solvents contained in the coating will evaporate during anti-corrosion coating operations in a limited space, causing an increase in the concentration of toxic gases in the limited space.

2. Definition of Toxic Space

3. Measures taken for toxic gases in confined spaces