epa greenhouse gas reporting – subpart w fugitive methane emissions john erickson, pe american...
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EPA Greenhouse Gas Reporting – Subpart W
Fugitive methane emissions
John Erickson, PEAmerican Public Gas Association
EPA Greenhouse Gas Reporting – Subpart W
Fugitive methane emissions
John Erickson, PEAmerican Public Gas Association
the voice and choice of public the voice and choice of public gasgas
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Purpose of this Webinar
• Summarize the fugitive emission estimating requirements of the rule
• Demonstrate how to use the APGA EXCEL spreadsheet calculator to determine if you are required to report under Subpart W
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Why Fugitive Methane?
• EPA believes that methane, the primary component of natural gas, is a greenhouse gas ~ 21 times more effective than carbon dioxide
• EPA wants an inventory of all greenhouse gas emissions
• No reductions are mandated at this time
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Reporting
• First reports are due March 30, 2012 for estimated emissions for calendar year 2011
• Reporting is on-line via the EPA’s E-GGRT system
• Utilities with estimated fugitive emissions plus combustion emissions over 25 thousand metric tons CO2 equivalent must report
• Estimates must be based on EPA’s emission factors, not actual emissions
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What to Report
• # of leaking meters, regulators, and associated equipment at above grade transmission-distribution transfer stations, including equipment leaks from connectors, block valves, control valves, pressure relief valves, orifice meters, regulators, and open ended lines.
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What to Report
• Estimated emissions from:– Below grade transmission-distribution transfer
stations.– Above grade metering-regulating station. – Below grade metering-regulating stations.– Mains– Services
• Complete list found at 98.236(a)(16) of the rule
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What to Report
• Also report under subpart W of this part the emissions of CO2, CH4, and N2O from stationary fuel combustion sources following the methods in §98.233(z).
• (z)(3) External fuel combustion sources with a rated heat capacity equal to or less than 5 mmBtu/hr do not need to report combustion emissions or include these emissions for threshold determination in §98.231(a).
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98.233(z) Methods
• CO2 = scf *0.001028 mmbtu/scf * 53.02 kgCO2/mmbtu * 0.001mt/kg
• CH4 = scf * mmbtu/scf * 0.001 kg CH4/mmbtu * 0.001 mt/kg * 21 mt CO2e/mtCH4
• N2O = scf * mmbtu/scf * 0.0001 kgN2O/mmbtu * 0.001 mt/kg * 310 mtCO2e/mt N2O
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Annual Leak Surveys Required
• At least once each year, check “TD transfer station” components for leaks
• “Transmission-distribution (TD) transfer station means a meter-regulating station where a local distribution company takes part or all of the natural gas from a transmission pipeline and puts it into a distribution pipeline.”
• This is the only actual measurement required for fugitive methane from distribution systems
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Important Definitions
• “Natural gas distribution means the distribution pipelines and metering and regulating equipment at metering- regulating city gate stations, and excluding customer meters, that physically deliver natural gas to end users and that are operated by a Local Distribution Company (LDC) within a single state.”
• “Metering-regulating station means a station that meters the flowrate, regulates the pressure, or both, of natural gas in a natural gas distribution facility. This does not include customer meters, customer regulators, or farm taps.”
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What is a leak?
• Measurement means determining, yes or no, if the equipment is leaking, not the volume of gas leaking
• 98.234 (a)(2) Method 21. Use the equipment leak detection methods in 40 CFR part 60, appendix A-7, Method 21. If using Method 21 monitoring, if an instrument reading of 10,000 ppm or greater is measured, a leak is detected.
• Method 21 includes HFI, CGI, etc.
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Example: Springfield, MO
• 5 TD Gate stations (owns meter runs at 1)• 31 BG M&R Stations 100-300 psig inlet• 81 BG M&R stations < 100 psig inlet• Mains:
– 418.69 miles protected steel– 838.57 miles plastic
• Services:– 13,951 protected steel– 62681 plastic
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Leaker Emission Factors
• Above Grade Transmission/distribution transfer stations– Connector = 1.72 cf/hr/count– Block Valve = 0.566 cf/hr/count– Control Valve = 9.48 cf/hr/count– Pressure Relief Valve = 0.274 cf/hr/count– Orifice Meter = 0.215 cf/hr/count– Regulator = 0.784 cf/hr/count– Open-ended Line = 26.533 cf/hr/count
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Leaker Emission Factors
• “If one leak detection survey is conducted, assume the component was leaking for the entire calendar year.
• If multiple leak detection surveys are conducted, assume that the component found to be leaking has been leaking since the previous survey or the beginning of the calendar year.
• For the last leak detection survey in the calendar year, assume that all leaking components continue to leak until the end of the calendar year.”
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Leaker vs Population Factor
• Leaker emission factor applies only to equipment found to be leaking
• Population emission factors apply to the total count of the type of equipment regardless of whether or not it is actually leaking
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the voice and choice of public gasthe voice and choice of public gasPopulation Emission Factors -
• Distribution Mains– Unprotected Steel = 12.77 cf/hr/mile– Protected Steel = 0.36 cf/hr/mile– Plastic = 1.15 cf/hr/mile– Cast Iron = 27.67 cf/hr/mile
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the voice and choice of public gasthe voice and choice of public gasPopulation Emission Factors -
• Distribution Service lines– Unprotected Steel = 0.19 cf/hr/service– Protected Steel = 0.02 cf/hr/service– Plastic = 0.001 cf/hr/service– Copper = 0.03 cf/hr/service
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Population Emission Factors
• Below Grade Metering-Regulating station– Inlet Pressure > 300 psig = 1.32 cf/hr/station– Inlet Pressure 100-300 psig = 0.20 cf/hr/station– Inlet Pressure < 100psig = 0.10 cf/hr/station
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Population Emission Factors
• For above grade meter-regulator stations, the population emission factor is the average calculated hourly emission rate per meter/regulator run at TD Transfer stations
• EF = Sum (Es,i/8760/Count) (Eq. W-32)• Es,i = Annual volumetric GHG emissions at standard
condition from all equipment leak sources at all above grade TD transfer stations, and
• Count = Total number of meter/regulator runs at all above grade TD transfer stations.
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Go to Spreadsheet
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Questions?Questions?
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