Prevention of flammable gas and coal dust explosions in collieries
Prevention of flammable gas and coal dust explosions in collieries
3.4.2. The fourth sub-barrier, furthest from the last through road , must be installed not more than 120m from the first sub-barrier;
3.4.3. The two intermediate sub-barriers must be equidistant between the first and fourth sub-barriers;
3.4.4. The presence of splits must be ignored in determining distances; and
3.4.5. The maximum distance between sub-barriers must not exceed 30m.
3.5. Siting of bagged stone dust barriers
3.5.1. Conveyor belt roads
An inertisation barrier must be provided in every production section in the road carrying a conveyor belt. The construction of the barrier will be based on the dimensions of the belt roads.
3.5.2. Single entries
Every single entry must be protected with a barrier the same as per conveyor belt roads.
3.5.3. Return airways
Must be protected either by high level of incombustible matter (80%) for the first 1000 m out bye of the face area or by a barrier to be installed and moved forward in line with the conveyor belt road barrier. Thereafter a 65% of incombustible matter must be maintained.
4.
Active roadway barrier
4.1. Electronic activation of inertisation material for the purpose of stopping flame propagation from a coal dust explosion can be installed in the place of a stone dust barrier based on risk assessment.
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