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Coal Mining Most Frequently Cited Standard of 2010

The accumulation of combustible materials in coal mines leads all violations in the last 90 days with 2,197 violations, or 11.52% of all violations.

From the Mine Safety and Health Administration, www.msha.gov, 30 CFR § 75.400:

Coal dust, including float coal dust deposited on rock-dusted surfaces, loose coal, and other combustible materials, shall be cleaned up and not be permitted to accumulate in active workings, or on diesel- powered and electric equipment therein.

[61 FR 55527, Oct. 25, 1996]

For an explosion to occur, there are five necessary elements which must occur simultaneously: fuel, heat, oxygen, suspension, and confinement. These form the five sides of the Explosion Pentagon. Like the fire triangle, removing any one of these requirements would prevent an explosion from propagating. For example, if fuel, heat, oxygen, and confinement occurred together in proper quantities, an explosion would still not be possible without the suspension of the fuel. However, in this case, a fire could occur. If the burning fuel were then placed in suspension by a sudden blast of air, all five sides of the explosion pentagon would be satisfied and an explosion would be imminent.

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