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 establish and maintain the gas management system: legislative requirements for including air quality, maximum values, control and distribution, flammable gas limits, ventilation fans, gas monitoring and inspections and recording/reporting the methods of mine ventilation and their applications/limitations including exhaust/force, antitropal, homotropal, flank returns, ascensional/descensional, bleeder, Z/U/Y systems and other combinations the methods of panel gas management and their applications/limitations including homotropal and antitropal (and in conjunction with these, the use of goaf bleed or back return), auxiliary fans, coursed ventilation (narrow side/wide side), machine mounted scrubber systems, compressed air venturis and bleeders the impact of mining techniques and mine and panel design on gas management the impact of coal characteristics and coal seam gradients on mine gas systems mine gases; the types and their characteristics, sources, physiological effects and methods of detection the use and calculation of specific gas emissions mine fires; the types, sources of ignition and possible impacts of gas management pressure changes; causes and the impacts on gas management heat / humidity; the sources and factors which may impact on gas management mine fans; fan laws, fan types, performance characteristics, configurations, application and limitations gas control devices; the types, purposes, design criteria and specifications, distribution / placement criteria, hazards and limitations including gas drainage de-gassing; methods of control - including brattice, auxiliary fans, compressed air venturis, sails, hurdles and bleeders fixed gas monitoring systems, types, characteristics, uses and limitations portable monitoring equipment, types, characteristics, uses and limitations functions, capabilities, advantages, limitations and uses of computer modelling and simulation techniques for gas management a basic knowledge of computer-based systems for mine gas analysis Gas Management System development requirements and processes gas surveys; the types, frequency and methods for conducting processes and techniques for determining alarms and trigger points / levels audit and review processes and techniques emergency response and disaster planning processes and techniques general uses and application of gas management theory, including: gas laws including Charles and Boyle natural ventilation Coward's Triangle Graham's Ratio Ellicott Diagram gas make Morris' Ratio Trickett's Ratio leakage psychrometry and heat Hughe's and Raybould triangle oxides of carbon ratio Kirkoff's laws geological data principles of ventilation management mine and goaf ventilation systems underground water management principles gas management drilling techniques site environmental monitoring requirements risk management procedures |