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ZONES EXPLAINED
Zone 0 – Highest Risk (Gas/Vapor)
- Definition: An area where an explosive gas, vapor, or mist is present continuously or for long periods.
- Likelihood of Hazard: Constant or prolonged presence.
- Typical Industries: Oil refineries, underground fuel tanks, chemical manufacturing.
- Example Locations:
- Inside fuel storage tanks
- Interiors of process vessels handling flammable gases
- Sealed chemical reactors
Zone 1– High Risk (Gas/Vapor)
Area in which an explosive gas atmosphere is likely to occur during normal operation.
Typical examples include:
- Areas around pumps and valves
- Filling and transfer points
- Process equipment in refineries or chemical plants
Zone 2– Moderate Risk (Gas/Vapor)
Area in which an explosive gas atmosphere is not likely to occur in normal operation and, if it does occur, will exist only for a short period.
Typical examples include:
- Areas surrounding Zone 1 equipment
- Well ventilated plant areas near gas systems
Zone 20– High Risk (Dust)
Area in which a combustible dust cloud is present continuously, for long periods, or frequently.
Typical examples include:
- Inside silos
- Inside dust collectors
- Inside powder conveyors or processing vessels
Zone 21– High Risk (Dust)
Area in which a combustible dust cloud is likely to occur during normal operation.
Typical examples include:
- Bagging and filling stations
- Powder transfer points
- Milling machinery
Zone 22– Moderate Risk (Dust)
Area in which a combustible dust cloud is not likely to occur during normal operation and, if it occurs, will only exist for a short duration.
Typical examples include:
- Areas surrounding dust handling equipment
- Storage and packaging areas