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

Identifying Materials & Equipment

Combustible Dusts

Ignition Temperature

Where combustible dusts are present, two types of ignition temperatures must be considered: Layer Ignition Temperature This is the temperature required to ignite a layer of dust on an enclosure. Selection and design of enclosures must consider the fact that dust layers may tend to increase surface temperatures and the ignition temperature may decrease over time if the dust dehydrates or carbonizes due to the heat from the enclosure., and Cloud Ignition Temperature This is the temperature required to ignite a cloud of dust. Dust clouds could also be ignited by arcs or sparks, but those ignition sources are usually isolated by enclosures, whereas the surface temperature of an enclosure must be limited to keep it from being an ignition source., and equipment must be selected for the lower of these two values Where there are dust clouds, there will also be dust layers formed as the dust settles out on equipment surfaces. which is often the layer ignition temperature.

As they are for gases and vapors, control of surface temperatures in dust environments is critical for heat-producing equipment such as motors, luminaires, and transformers.

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

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