Code of Practice for coal seam gas well head emissions detection ...

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Appendix 1 — Gas comparison table The table below compares the specific gravity, energy content and the PPM (parts per million) values corresponding to 100%, 10%, 5% and 1% LFL readings for CSG (methane) and LPG respectively. The table provides a comparison of the different measurement units (LFL and PPM) and demonstrates that compared to LPG, which is a gas in common domestic use, CSG/methane represents a much lower risk although both gases when managed appropriately are safe to use. For example, the gravity for CSG/methane is much less than one, indicating that methane will rise and disperse into the atmosphere when released and will not form pools at ground level as in the case of LPG. The heating value of LPG is much higher than CSG/methane, meaning LPG emits more energy per cubic metre of gas when it is burnt. The PPM values indicate that LPG has a greater risk of flammability even at substantially lower levels of gas concentration in air. This table is for informative purposes only. Gas Comparison Table Gas Specific Gravity [note 1, 3] Heating Value (mJ/m 3 ) [note 2,3] PPM at LFL PPM at 10% LFL PPM at 5% LFL Code of Practice for CSG well head emissions, detection and reporting - Version 2 June 2011 12 PPM at 1% LFL Methane (CSG) 0.554 38.7 53,000 5,300 2,650 530 LPG (typical) 1.609 95.5 21,000 2,100 1,050 210 Notes: [1] Specific gravity is the density of the gas relative to air. Values greater than one indicate that the gas is denser than air and can accumulate at ground level to form pools. Values given are at normal atmospheric temperature and pressure — 20 o C and 1 atmosphere respectively. [2] Approximate gross heating value. [3] Values in columns 2 and 3 are an average calculated from maximum and minimum Australian pipeline quality natural gas specifications.
Appendix 2 — Definitions Well Head Reportable Leak is defined as: 1. An emission due to an unplanned release from a CSG well site facility that, at a measurement distance of 150mm immediately above (and downwind) and surrounding the leak source in an open air environment above ground position; gives a sustained LFL reading greater than 10% of LFL for a 15 second duration. 2. The following incidents/circumstances also fall under the definition and require CSG operators to notify the P&G Inspectorate: a) an unplanned hydrocarbon gas release reported by the emergency services, a public authority or member of the general public; b) an unplanned hydrocarbon gas release resulting in an incident involving fire or injury; c) an unplanned hydrocarbon gas release which has media attention, and d) an unplanned hydrocarbon gas release with the potential for significant escalation close enough to a building or other confined space and large enough that gas is likely to enter any building or confined space. Internally Reportable Well Head Leak is defined as: Any leak of gas from a CSG well site facility that falls outside of the above definition of wellhead reportable leak. These leaks will be subject to reporting procedures and rectification treatment specified by each CSG operator’s procedures and risk based assessments. CSG Operator is defined as: The company that is responsible for the safe operation and management of CSG authorised activities on Authorities to Prospects (ATP’s), Petroleum Lease Applications (PLA’s) or Petroleum Leases (PL’s) under section 670(6) of the P&G Act. The operator is defined under section 673 of the P&G Act. CSG Well is defined as: A well that is constructed to allow gas from coal seams to migrate into the well, and which may contain pressurised hydrocarbon gas (eg methane). CSG Well Site Facility is defined as: The above ground equipment located in the immediate proximity of a CSG well and connected to that CSG well, which contains or may contain pressurised hydrocarbon gas. It includes the well head, pumping equipment, the production separator and interconnecting pipe work and fittings. Leak Management Plan is a plan that is part of the CSG operator’s safety management plan for leaks from CSG wells and CSG well site facilities to ensure that emissions are: 1. Identified; 2. Classified; 3. Controlled (eg isolated, rectified, monitored) as determined by considering the risk and determining the appropriate controls; and Code of Practice for CSG well head emissions, detection and reporting - Version 2 June 2011 13
Page 1 and 2: Department of Employment, Economic
Page 3 and 4: Contents Introduction 4 Objective 4
Page 5 and 6: Purpose of the Code This Code of Pr
Page 7 and 8: Code of Practice operational requir
Page 9 and 10: Tester and instrument certification
Page 11: The perimeter of all barrier fencin
Page 15: Appendix 3 — Petroleum and Gas In

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