Explosion hazard zones in petrochemical fire protection codes
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Explosion hazard zones per the petrochemical fire protection codes. What does an additional Zone 2 (Specification page 19, 5.2.18) mean? Are there also zones like Zone 0 and Zone 1, and what do they refer to?
Zone 2 means that smoking in this area might be suicidal; smoking in Zone 1 is indeed suicidal, while smoking in Zone 0 means certain death
Zone 0 is an area where explosive gas mixtures are present continuously or for extended periods of time, such as inside storage tanks； Zone 1 is an area where explosive gas mixtures may occur during normal operation, such as within 3 meters around production units and storage tanks ； Zone 2 is an area where explosive gas mixtures are unlikely to occur under normal operating conditions, such as within a certain range outside Zone 2.
Is Additional Zone 2 included in the GB50058-2014 Code for Design of Electrical Installations in Explosive Atmospheres? I couldn’t find it