Prevention of flammable gas and coal dust explosions in collieries

Prevention of flammable gas and coal dust explosions in collieries

24) “Permanent walls” means a robust airtight wall constructed of bricks and cement or similar materials.

25) “SANAS” means South African National Accreditation System.

26) “Sealed area” means an area which is isolated from the ventilation district with containment walls or explosion proof seals in accordance with this mandatory COP .

27) “Simple apparatus” means a device which does not generate more than 1.5 Volts, 100 mA and 25 mW as per SANS IEC: 1999 60079-11 as amended.

28) “Specialist flammable gas measuring instrument” means an intrinsically safe instrument that complies with the requirements of SANS 1515.

5. SCOPE

This guideline defines topics which need to be addressed in the COP to significantly reduce the risk of flammable gas or coal dust explosions in collieries. The aspects to be addressed include at least the following:

(a) The significant risks associated with flammable gas .

(b) Ventilation arrangements.

(c) Ventilation methods.

(d) Ventilation design.

(e) Application of ventilation methods and design.

(f) The significant risks associated with coal dust (spontaneous combustion and explosions).

(g) Limiting the formation and dispersion of coal dust.

(h) Inertisation of coal dust.

(i) Application of barriers to prevent the propagation of explosions.

(j) Control of abandoned areas .

(k) Control of sealed-off areas.

This guideline supersedes previously issued directives and/or instructions by the DMR dealing with:

(a) Mechanical Miner Ventilation.

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