2022 registered safety engineer technical gold test point explosive hazardous environment, note the Anshi Xueba notes, long press to like + forward + comment for continuous updates, click on my avatar in the Wendang version and send me a private message: 2022
1. Gas and steam explosive hazardous environment
According to the frequency and duration of the occurrence of explosive gas and vapor mixtures, dangerous places are divided into Zone 0, Zone 1 and Zone 2.
(1) Zone 0 refers to the area where explosive gas, vapor or mist appears continuously or for a long time or frequently in a short period of time during normal operation, and can form explosive mixtures.
(2) Zone 1 refers to the area where explosive gas, vapor or mist may appear during normal operation (expected to occur). An area where explosive gas, vapor or mist appears periodically or accidentally and can form explosive mixture .
(3) Zone 2 refers to an area where explosive gas, vapor or mist may appear accidentally for a short period of time and can form an explosive mixture if it does not appear during normal operation.
2. Dust and fiber explosion hazardous environments
According to the frequency and duration of the occurrence of dust and fiber mixtures, such hazardous places are divided into: Zone 20, Zone 21 and Zone 22.
(1) Zone 20. Areas where combustible dust clouds in the air appear continuously, long-term or frequently in explosive environments.
(2) Zone 21. During normal operation, airborne combustible dust clouds are likely to occasionally occur in areas with explosive atmospheres.
(3) Zone 22. During normal operation, combustible dust clouds in the air are generally unlikely to appear in areas with explosive dust environments, and even if they do appear, the duration is short-lived.
The level and size of dust and fiber explosion hazard areas are affected by factors such as the amount of dust, dust explosion limit and ventilation conditions.
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