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NOTE: This is an unformatted excerpt from our online fire protection training library.

Classification Basics

Classification Terminology

Zone 1

Zone 1 areas are those where ignitable mixtures of gases or vapors exist normally or frequently either during normal operations or during maintenance operations, excluding those areas included in Zone 0 where the ignitable mixtures are present continuously or for long periods of time. The areas immediately adjacent areas immediately adjacent
Since a Zone 0 area is an area where an ignitable atmosphere is likely to be present most or all of the time, the adjacent area, unless cut off by a physical barrier like the wall of the tank shown here, is likely to also have an ignitable atmosphere at times because the vapor or gas is likely to move beyond the area boundary. Often the different areas are defined only by a distance from a vapor source and there is no visible boundary. to Zone 0 areas are usually Zone 1 areas. 
The area surrounding the vents on this tank are Zone 1 areas.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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