Classification of Hazardous Areas in Explosive Gas Environments

Different countries and regions classify explosion hazardous areas according to their respective standards. According to the frequency and duration of explosive gas mixtures, explosive gas environments in China are divided into Zone O, Zone 1, and Zone 2. (Consistent with IEC International Electrotechnical Commission)

Zone 0: An environment where explosive gas mixtures occur continuously or for a long time.

Zone 1: An environment where explosive gas mixtures may occur during normal operation.

Zone 2: An environment where explosive gas mixtures are unlikely to occur during normal operation or where explosive gas mixtures only exist for a short period of time if they do occur.

Zone 0 generally only exists in sealed containers, storage tanks, and other internal gas spaces, and in the actual design process, Zone 1 is rarely present, mostly belonging to Zone 2.