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Typical Applications

Zone 1/Zone 21

Zone 1/21 areas are defined as areas where an explosive atmosphere consisting of a mixture with air or flammable substances in the form of gas, vapour, powder, dust or mist is likely to occur in normal operation occasionally.

As the release of a flammable substance can occur during normal operation, equipment operating in a Zone 1/21 certified area must be protected so that it can continue to operate in the event of a release.

Zone 1/21 areas typically tend to be process areas, where materials are being mixed and are far more likely to be released into the atmosphere. These are much more common for materials handling industrial applications, and are a very rare requirement in oil and gas applications.

Zone 2/Zone 22

Zone 2/22 areas are defined as an area where air and flammable substances in the form of gas, vapour, powder, dust or mist is not likely to occur in normal operation, but if it does occur, will persist for a short period only.

As the release of a flammable substance will not occur during normal operation, the equipment operating in a Zone 2/22 certified area is protected in case of a release, and the equipment will be shut down to prevent the risk of explosion.

Zone 2/22 areas tend to be warehouse and storage areas where potentially flammable materials are stored, and the material will only be released in the event of spillage or accidental release.

Zone 2 areas make up the vast majority of oil and gas engine applications, and are also a very frequent requirement for materials handling industrial applications.

Added Safety

Added Safety areas are any areas which are not classified as Zone 2/22 or Zone 1/21. They primarily fall under the following three categories:

  • Non-classified areas – any area which is not classified as potentially hazardous
  • De-classified areas – any hazardous area which has been down-graded to non-classified after your own risk assessment
  • Close proximity areas – any area which is bordering on or within close proximity to a hazardous area

Added Safety areas tend to make up the majority of a site, but the boundaries are flexible and all equipment operating on a site should be protected.

These are a requirement in both materials handling and oil and gas applications.