Mine Health and Safety Act, 1996 (Act No. 29 of 1996)

Notices

Guideline for the Compilation of a Mandatory Code of Practice for the Prevention of Flammable Gas and Coal Dust Explosions in Collieries

Annexures

Annexure 2 : Guidance Note for the prevention of flammable gas and coaldust explosions in collieries

3. Design Objectives
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3.1. Only criteria based on empirical and proven scientific design applications should be considered.

 

3.2. Dust should be effectively controlled where generated, and not be permitted to escape from the heading uncontrolled and untreated so as to exceed acceptable levels.

 

3.3. Flammable gas should be diluted to acceptable levels by providing sufficient fresh air.

 

DEFINITION:

 

Acceptable Levels

 

Dust Concentration (for less than 5% quartz content)

 

Personal sampling - a respirable eight-hour TWA concentration of less than 2 mg/m3 as per airborne pollutant sampling programme

 

Acceptable levels

 

Flammable gas concentration

 

A flammable gas concentration of less than 1,4%.

 

Last through road

 

The last through road in a coal mine will constitute the closest holing to the working faces between two companions, which carry a unidirectional flow of air from the intake to the return of the section.

 

Recirculation

 

When any amount of air which has been delivered by a particular ventilation system, ventilating a heading, re-enters the inlet of that system.

 

Return air

 

Air which has scrubbed the face of a heading.