Explosion Class 1

Last Updated: February 19, 2017

Definition - What does Explosion Class 1 mean?

An explosion class 1 refers a location in which flammable gases or vapors are or may be present in the air in sufficient quantities to produce an explosive gas atmosphere or ignitable mixtures.

Safeopedia explains Explosion Class 1

Single or multiple element mixtures that are in a gaseous state under normal atmospheric conditions, such as hydrogen or methane vapor, which are normally flashed off from a liquid under normal atmospheric conditions, like gasoline, are classic examples of an explosion class 1 location.

Explosion class 1 locations are further sub divided in divisions based on the probability of presence of explosive gas atmosphere in the location. The division defines the probability of the presence of an explosive or ignitable mixture.

  • Division 1 - a gaseous, explosive or ignitable mixture is present continuously, intermittently, or periodically
  • Division 2 - a gaseous, explosive or ignitable mixture is present only for a short period of time
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