Specific knowledge is required to achieve the Performance Criteria of this unit, particularly for its application in the various circumstances in which this unit may be used. This includes knowledge of the following, as required to implement the gas drainage management plan: legislative and site requirements which may include those for gas drainage drilling, gas drainage installation and recovery, ventilation requirements, return airways gas levels, intake airway gas accumulated levels, gas control and distribution, environmental management, local government requirements, inspections and reporting the methods of gas drainage and their applications/limitations against the mine design, mine and panel ventilation systems, systems of mining and current and future mine development the impact of gas drainage on mining techniques, mine and panel design and production output the impact of the strata geology and coal seam characteristics on the gas drainage management plan, including coal seam gradient, moisture content, friability, the porous features of the coal seam, stresses and intrusions outburst mining monitoring procedures drilling options and related equipment and techniques hazard management processes and techniques the effects of the type and quantity of gas in the coal seam impacts of accumulation of coal dust after gas drainage has been completed pressure changes; causes, the impacts on the ventilation system, and the effects on gas drainage heat/humidity; the sources and factors which may impact on gas drainage and personnel mine fans; fan laws, fan types, performance characteristics, configurations, applications and limitations in association with the gas drainage management plan, ventilation control devices; the types, purposes, design criteria and specifications, distribution/placement criteria and limitations in association with the gas drainage management plan, ventilation control devices; the types, purposes, design criteria and specifications, distribution/placement criteria and limitations de-gassing; methods of control - including brattice, auxiliary fans, compressed air venturis, sails, hurdles, bleeders and purging fixed gas drainage monitoring systems types, characteristics, uses and limitations use of computer-based systems for mine environment and gas drainage systems analysis Gas Drainage Management Plan development requirements and processes gas drainage surveys; the types, frequency and method for conducting including pressure/quantity/temperature and gas processes and techniques for determining alarms and trigger points/levels audit and review processes and techniques site document control requirements emergency response and evacuation procedures general uses and applications of ventilation theory, including: Atkinson's equation methods of determining frictional resistance gas laws, including Charles and Boyle natural ventilation pressures gas make leakage determination of mine resistance curves regulator and equivalent orifice calculation determination of fan operating/duty points Kirkoff's laws mine operational procedures strata control systems and their effects on gas drainage mine and goaf ventilation systems underground water management principles and systems impacts of intersecting and intersected holes and hole design site environmental monitoring requirements legislative and mine reporting procedures |