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

Identifying Materials & Equipment

Liquids, Vapors & Gases

Terminology

In addition to the flash point The minimum temperature at which a liquid gives off vapor in sufficient concentration to form an ignitible mixture with air near the surface of the liquid, as specified by test. which was defined previously, flammable liquids, gases, and vapors have other important fire and explosion characteristics that are used to categorize the materials and to properly design electrical equipment for use in hazardous (classified) areas. The acronyms for these terms include:
          MIC Ratio Minimum Igniting Current Ratio
          MESG Maximum Experimental Safe Gap
          UFL Upper Flammable Limit - one of the flammable limits
          LFLLower Flammable Limit - one of the flammable limits
          AIT Autoignition Temperature
          MIE Minimum Igniting Energy
Two other important issues are explosion pressure and pressure piling. The definitions and significance of these terms are discussed in the following pages.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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