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Identifying Materials & Equipment

Liquids, Vapors & Gases

Combustible Liquids

Combustible liquids are subdivided into Class II Class II liquids are those having flash points at or above 100°F (37.8°C) and below 140°F (60°C). and Class III Class III liquids are those having flash points at or above 140°F (60°C) and are further subdivided into Class IIIA and Class IIIB, where Class IIIA liquids have flash points below 200°F (93.4°C) and Class IIIB liquids have flash points at or above 200°F. liquids based on their flash points. Class II liquids such as fuel oil There are a number of grades of fuel oil, some of which are Class III liquids, including many home heating oils. Diesel fuel and kerosene are usually considered to be Class II liquids because most have flash points over 100° F, although some grades may have flash points of over 140°F. are usually stored and handled at temperatures below their flash points. Combustible liquids handled below their flash points do not create hazardous (classified) locations. However, where combustible liquids are handled above their flash points, the hazards are much the same as those associated with flammable liquids and such areas do require classification and the use of special electrical equipment. Class III liquids will not create flammable atmospheres in normal ambient temperatures, but could create a classified area where they are heated above their flash points.

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

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